CN1675008A - Hot rolling method and apparatus for hot steel sheet - Google Patents

Hot rolling method and apparatus for hot steel sheet Download PDF

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Publication number
CN1675008A
CN1675008A CNA038187701A CN03818770A CN1675008A CN 1675008 A CN1675008 A CN 1675008A CN A038187701 A CNA038187701 A CN A038187701A CN 03818770 A CN03818770 A CN 03818770A CN 1675008 A CN1675008 A CN 1675008A
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China
Prior art keywords
width
temperature
steel plate
hot
rolling
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Granted
Application number
CNA038187701A
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Chinese (zh)
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CN100333846C (en
Inventor
吉田满
木村宽
野口浩嗣
中本武广
坂上浩喜
高桥航也
吉山智明
山田彻哉
岩尾雄介
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Nippon Steel Corp
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Nippon Steel Corp
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Publication date
Priority claimed from JP2002193300A external-priority patent/JP4133042B2/en
Priority claimed from JP2002206831A external-priority patent/JP2004050183A/en
Priority claimed from JP2002365867A external-priority patent/JP3793503B2/en
Priority claimed from JP2003034808A external-priority patent/JP3793512B2/en
Priority claimed from JP2003070030A external-priority patent/JP3793515B2/en
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of CN1675008A publication Critical patent/CN1675008A/en
Application granted granted Critical
Publication of CN100333846C publication Critical patent/CN100333846C/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0478—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular surface treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B21B2261/21—Temperature profile
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/02—Edge parts

Abstract

A hot rolling method and apparatus for producing hot rolled steel sheet free from variation in material properties in the width direction by making a temperature profile uniform over the entire width direction of a rough bar at a finishing mill entry side or exit side are provided, which hot rolling method of steel sheet heating a rolling material while changing a temperature rise in a width direction of the rolling material so that a temperature profile in a width direction of the rolling material at the finishing mill (7) entry side or exit side becomes uniform, for example, heating so that at least the temperature rise at a center of the rolling material in the width direction becomes greater than the temperature rises at intermediate parts between that center and the two edges in the width direction or heating so that the temperature rises at the two edges of the roughing mill in the width direction become greater than the temperature rises at the intermediate parts in the width direction of the width direction.

Description

The hot-rolling method of hot steel plate and device
Technical field
The present invention relates to the hot rolling of steel plate, more particularly, relating to a kind of being used for by the temperature on the width that makes the rough bar (rough bar) at the finishing mill feed side is that a predetermined temperature profile figure (distribution map) comes high yield ground to produce the hot-rolling method and the device of hot rolled steel plate.
Technical background
As shown in Figure 1, the hot rolling of steel plate is performed such: a low temperature slab 2 is packed in the heating furnace 1 so that this slab is reheated a predetermined temperature, utilize a roughing mill 3 that this slab that reheats 2 is rolled down to a predetermined thickness to obtain a rough bar 4, use a crop(ping)shears 5 to wipe out the front end and the tail end of this rough bar, utilize two edges of an edge heater 6 heating to compensate the temperature drop of two edges on the width of this rough bar 4, use one becomes a predetermined hot rolled steel plate by the finishing mill 7 of the continued operation that a plurality of frames are formed with this bar finish rolling, go up this steel plate of cooling by a cooling frame 8 at a runout table (runout table) then, and use a coiling machine 9 these steel plates of coiling.
As shown in Figure 2, when rough bar being bonded together when carrying out finish rolling before being used for being the finish rolling of endless rolling, the heating furnace 1 of one low temperature slab 2 can being packed into is interior so that this steel billet is reheated a predetermined temperature, use a roughing mill 3 that this slab that reheats 2 is rolled down to a predetermined thickness to obtain a rough bar 4, use a coil box 10 these rough bars of coiling, use a strip cutter 11 to wipe out from the front end of the rough bar of this coil box expansion, make one the preceding the front end of tail end and the rough bar subsequently of rough bar engage, utilize two edges on the width of the rough bar 4 of an edge heater 6 heating with the temperature drop of compensation in these two edges, the finishing mill 7 that uses a continued operation of being made up of a plurality of frames is so that become a hot rolled steel plate of being scheduled to this bar finish rolling, use a cooling frame 8 on a runout table, to cool off this steel plate then, and use a coiling machine 9 these steel plates of coiling.
In the hot rolling or endless rolling technology of this hot rolled steel plate,, be inevitable so during heating in slab, heat inhomogeneous owing in heating furnace, slab is reheated high temperature from low temperature.In addition, the thickness of rolling stock is less than width, thereby produces temperature drops in two edges of rough bar.This temperature drop means the temperature profile that can not obtain being scheduled on the width of rough bar, and produces uneven situation, and becomes the uneven reason of finishing temperature.
Therefore, if the temperature profile on the width of rough bar becomes inhomogeneous, then during finish rolling, can occur fluctuation or middle fluctuation in the hot rolled steel plate, then will become inhomogeneous, thereby other problem can occur along the mechanical performance on the width of hot rolled steel plate and other material behavior.
In order to prevent owing to along the inhomogeneous problem that causes of the temperature profile on the width of rough bar, known heater and the edge heater of being provided with between roughing mill and finishing mill heats rough bar through this roughing mill roughing.For example, someone proposes, one solenoid type induction heater is set between roughing mill and finishing mill, to be used for this rough bar of heating on the whole width of rough bar, and an edge heater is set, being used to heat two edges of this rough bar, and use this solenoid type induction heater and this edge heater to heat rough bar so that the temperature on the width evenly (for example, Japanese unexamined patent publication No. open (Kokai) No.3-314216) at the feed side of finishing mill.
Solenoid type induction heater used herein is characterised in that its magnetic signature, i.e. this steel plate of coil encircling and generation is parallel to the magnetic field of this steel plate.Its is concentrated the whole surface of steel plate of heating and utilizes the heat conduction, so that temperature finally reaches balance, and the therefore temperature identical amount that just in time raises under the substantially invariable situation of the temperature profile on the width.
Promptly, the technology that proposes above attempts rough bar evenly to be heated generally on width by a solenoid type induction heater, and by using two edges of heater heating, an edge to make the temperature profile on the width even, to reduce rolling load.
But, the inventor has studied the material behavior of hot rolled steel plate on width, found that promptly use the edge heater heating to have the edge of remarkable temperature drop so that the temperature profile on the width is even, still there is variation in mechanical performance on the width of the steel plate that obtains by finish rolling.Promptly, (use heater) on the width evenly the whole rough bar of heating and use roughing mill and finishing mill between the edge heater heating have the heating means at two edges of remarkable temperature drop, be difficult to obtain homogeneous mechanical performance on the width of hot rolled steel plate.The inventor has carried out the reason of various experiments to explain that this thing happens, and finds that its reason is present in when heating slab in heating furnace.That is, heating furnace heats this slab in high-temperature atmosphere, thereby the temperature of the mid-depth of this slab is low inevitably.Even make this thickness reduce this temperature profile still can to keep by rolling, thereby the temperature of this center becomes and is lower than mean temperature on the width, and higher towards the temperature at edge.The inventor finds, even by the rolling thickness that reduced, this trend in the temperature profile still remains unchanged, therefore this reason is present in the temperature profile, that is, the temperature profile of rough bar left and right sides on width is asymmetric, and the temperature of center is lower than the mean temperature on the width, the temperature of (part) is higher towards the edge, and the temperature of this edge is minimum.
Therefore, use the heating means of edge heater or solenoid type induction heater that the material behavior on the width is kept evenly.
Therefore, the purpose of this invention is to provide a kind of hot-rolling method and device that is used for stably producing the hot rolled steel plate that on width, has predetermined material behavior, this method and apparatus is by changing the temperature rise (preferably being increased in the temperature rise of the center low temperature part on the width) on the width of rough bar, so that the temperature profile that obtains being scheduled on the width of this rough bar of finishing mill feed side or exit side.
In addition, consider above-mentioned situation, the purpose of this invention is to provide a kind of method that heats steel plate, this method can heat any zone on the width of steel plate (steel band), and can control the temperature profile on the width of steel plate.
In addition, the purpose of this invention is to provide a kind of hot-rolling method and device that does not have the hot rolled steel plate of variation by the mechanical performance of finish rolling high yield ground production on width, this method and apparatus by heating rough bar center low temperature part and the low temperature at two ends partly to raise their temperature, so that on the whole width of this rough bar of the feed side of finishing mill or exit side, obtain the even temperature distribution map, and the load of the temperature by the rough bar that raises generally when alleviating finish rolling is to guarantee to be used to obtain the temperature of required material behavior.
In addition, the purpose of this invention is to provide a kind of hot-rolling method and device that does not have the hot rolled steel plate of variation by the mechanical performance of finish rolling high yield ground production on width, center low temperature part and the two ends low temperature part and by the left and right sides asymmetric temperature profile elimination width on of this method and apparatus by the rough bar of heating, so that on the whole width of this rough bar of the feed side of finishing mill, obtain the even temperature distribution map, to guarantee to be used to obtain the temperature of required material behavior.
The inventor finds, the material behavior of hot rolled steel plate on width do not changed, must make the temperature profile on the width of the rough bar of finishing mill feed side even, for this purpose, the temperature of center low temperature part of this rough bar can heat and raise, this low temperature is to cause owing to the temperature at slab slab center between the period of heating is low, and the temperature of the temperature drop at two edges of heating and this rough bar that raises part, this temperature drop causes when roughing, thereby can make the temperature profile on the width of rough bar even, heating whole width is favourable to guarantee final rolling temperature and to use the extraordinary lateral type induction heater of heat characteristic as heater, thereby can realize the present invention.
Can be manufactured on intensity is different on the width special base substrate with pressed material (base substrate) as automobile or other body part (body part).When being pressed into this body part, these special base substrates must have different mechanical performances at the predetermined position of this body part.
Past, general way is that a plurality of steel bands are welded together to obtain special base substrate, but in recent years, propose multiple need not the welding and made the method for special base substrate, this method is by changing the chilling temperature on the width of steel band direction when using runout table (ROT) that hot rolled strip is carried out water-cooled, so that the mechanical performance difference (for example, Japanese unexamined patent publication No. open (Kokai) No.11-192501 and Japanese unexamined patent publication No. open (Kokai) No.2000-11541) of steel band on width.
But in this method, it is essential that the steel band heating means that have the temperature difference on the width of steel band and device are thought at present.
The inventor finds, makes special base substrate by the cooling velocity that has the temperature difference on the width that made steel band before carrying out finish rolling rather than change on the width of steel band direction, can the manufacturing machine performance especially hole expansibility and the good special base substrate of elongation property.
The inventor finds, obtain mechanical performance on the width and do not have the hot rolled steel plate that changes, must the temperature profile on the width of rough bar be kept evenly at the finishing mill feed side, for this purpose, the temperature that needs the center low temperature part of the heating and the rough bar that raises, this low temperature is lower the causing of temperature owing to slab center when slab heats, and in order on the width that makes steel plate (rough bar) before the finish rolling, to have the temperature difference to obtain special base substrate, the temperature in any zone on the width of the needs heating and the rough bar that raises, for this purpose, steel plate (rough bar) vertically on a plurality of bar heaters that are made of the lateral type induction heater are set, moving this bar heater on the width of steel plate so that there is overlapping part (very big) on the longitudinal direction at steel plate thereby total temperature rise becomes, and operating this bar heater heats, then can heat and the rising temperature provides a temperature difference (being temperature rise) with any zone on the width of steel plate, thereby finish the present invention.
In the hot rolling (processing) of the steel that is carried out, all be that slab is heated to a predetermined temperature so far, use rolling this slab of roughing mill then to form a rough bar.Before using this rough bar of a finishing mill finish rolling, use a cutter to cut the front end and the tail end of this rough bar along the longitudinal direction.
A purpose of wiping out the front end of rough bar and tail end is a shape defect of removing the front end of this rough bar and tail end to prevent rolling uselessly in the finish rolling, and another purpose is to remove the low temperature part of front end and tail end.If finish rolling one rough bar under the situation of the low temperature part that keeps this front end and tail end, then this steel band can and can cause crackle on the surface of working roll at this low temperature partial rupture during finish rolling.If stay these crackles and rolling subsequently rough bar on the surface of this roller, then the crackle on the roller can be with constant delivered spaced to product, and this interval is complementary with the rotation period of roller, thereby causes product to have blemish.Therefore, when the front end of wiping out rough bar and tail end, usually, as shown in figure 27, the shape defect 215 of front end and tail end promptly so-called " fish tail end (stocking V-arrangement tail end) " not only, and all partly be removed as temperature drop from these shape defects towards the shape defect of central side longitudinally.Therefore, can not wipe out this bar at the position 219 of wiping out of routine.
Patent disclosure (Kokai) No.2-6002 that do not examine of Japan has illustrated a kind of milling method, this method comprises front end and the tail end that uses a crop(ping)shears to wipe out rough bar, uses a device (being also referred to as " edge heater ") that is used for heated end portion on the width of rough bar heated end portion in a longitudinal direction then.When heating in a longitudinal direction, move one and only have the edge heater of the ability of local heat end on width, therefore when front end that heats rough bar and tail end, this rough bar is stopped on the transport platform so that use.Therefore, when the heating front end, the temperature difference between (bar) part of contact conveying roller can not become very big.In addition, when the heating tail end, rough bar is transfused to finishing mill, therefore can not stop to carry rough bar so that it is fully heated.
Patent disclosure (Kokai) No.10-291016 that do not examine of Japan discloses a kind of invention, and this invention is installed a solenoid type induction heater so that heat the whole width of a rough bar around crop(ping)shears between roughing mill and finishing mill.Using before or after this crop(ping)shears wipes out the shape defect of the front end of rough bar and tail end, when (rough bar) during by this solenoid type induction heater ceaselessly the low temperature to front end on the longitudinal direction and tail end partly heat so that it has uniform temperature, final rolling temperature becomes and is higher than the initial temperature of ferrite transformation thus, and this bar of finish rolling is to obtain hot rolled strip then.Do not remove the low temperature part owing to only removed shape defect in the past, so output can descend.
But, the stage before finish rolling, foremost approaching more or caudal end, the temperature drop at the front end of rough bar and tail end place just becomes big more.Foremost or the caudal end place, can find sometimes to compare temperature drop above 200 ℃ with stable position.
The solenoid type induction heater is characterised in that, can evenly heat any position on width and the longitudinal direction.The big I of heater is determined according to the maximum temperature rise of rough bar.If want to compensate foremost or the caudal end place surpass 200 ℃ temperature drop, then need big heater, investment can be very big.On the other hand, if use the solenoid type induction heater of stock size, then can not compensate the front end of rough bar and the temperature drop above 200 ℃ of tail end, therefore, except shape defect, still leave the part that temperature does not have abundant rising at front end or tail end, therefore must wipe out remaining low temperature part.
Summary of the invention
The purpose of this invention is to provide one group of equipment of hot rolling and hot-rolling method, it does not require and make rough bar stop motion when heating, do not need huge investment, and make fully raising with the temperature of the temperature drop at caudal end place part foremost of rough bar, also make and only to wipe out shape defect.Main points of the present invention are as follows:
(1) a kind of hot-rolling method of steel plate, the hot-rolling method of described steel plate is characterised in that, the heating rolling material, change the temperature rise on the width of this rolling stock simultaneously, so that the temperature on the width of this rolling stock of the feed side of a finishing mill or exit side becomes a predetermined temperature profile.
(2) a kind of method that heats steel plate, it is characterized in that, a plurality of bar heaters on the longitudinal direction that is arranged on steel plate are moved on the width of steel plate, operate this bar heater heating, and be controlled at the temperature profile on the width of steel plate.
(3) a kind of method that heats steel plate, it is characterized in that, the a plurality of bar heaters that are arranged on the steel plate longitudinal direction are moved on the width of steel plate, so that have lap on the longitudinal direction of steel plate, and the amount of controlling this lap is with the temperature profile on the width of control steel plate.
(4) method of the heating steel plate of a kind of basis (2) or (3), it is characterized in that, after the center on the width that will these a plurality of bar heaters moves to this steel plate, heat center on the width of concentrating this steel plate of heating by operating these a plurality of bar heaters.
(5) method of the heating steel plate of a kind of basis (2) or (3), it is characterized in that, after will these a plurality of bar heaters moving to position, by operating all parts on the width that these a plurality of bar heaters heat this steel plate with constant interval.
(6) a kind of basis (2) arrives the method for any one heating steel plate in (5), it is characterized in that, use a temperature profile that is arranged on the width of this steel plate of width thermometer measure of upstream side of this bar heater, and determine the displacement of this bar heater according to the described temperature profile that measures.
(7) a kind of basis (2) arrives the method for any one heating steel plate in (6), it is characterized in that, can carry out moving in the roll coil of strip material.
(8) a kind of hot-rolling arrangement of steel plate, the hot-rolling arrangement of described steel plate is characterised in that, between the roughing mill on the roll line, between roughing mill and the finishing mill or a heater is set between the finishing mill, change the temperature rise on the width of the rolling stock of roughing mill feed side simultaneously to heat.
(9) hot-rolling arrangement of the steel plate of a kind of basis (8), it is characterized in that this heater is that the temperature rise of the center on a kind of width that makes this rolling stock at least becomes greater than the heater of the temperature rise of the mid portion between two edges on described center and this width.
(10) hot-rolling arrangement of the steel plate of a kind of basis (8) or (9) is characterized in that, this heater is that the temperature rise of two edges on a kind of width that makes this roughing mill becomes greater than the heater of the temperature rise of the mid portion on this width.
(11) a kind of basis (8) arrives the hot-rolling arrangement of any one steel plate in (10), the hot-rolling arrangement of described steel plate is characterised in that, this hot-rolling arrangement has a heater that only is used to heat the temperature rise on the width that changes this rolling stock one through the center low temperature part of the rough bar of roughing, simultaneously, and an edge heater that is used to heat two edge low temperature parts of this rough bar.
(12) a kind of basis (8) arrives the hot-rolling arrangement of any one steel plate in (11), it is characterized in that, this hot-rolling arrangement have one be arranged on a finishing mill feed side be used for the heating, change the heater of the temperature rise on the width of this rolling stock on the width of this rolling bar simultaneously, one is used to heat the edge heater of two edge low temperature parts on the width of this rough bar, with a temperature monitoring that is used to monitor the temperature profile on the width of this rough bar, the maximum of the temperature on the width that will be monitored by described temperature monitoring is as reference temperature (fiducial temperature), seek the temperature of the difference on this width and the temperature difference between this reference temperature, and determine the temperature rise that this difference is required, thereby make the temperature of this width become a predetermined temperature profile according to the described temperature difference.
(13) a kind of basis (8) arrives the hot-rolling arrangement of any one steel plate in (12), it is characterized in that, is provided with at least two heaters along this roll line.
(14) hot-rolling arrangement of a kind of basis (8) any one steel plate in (13) is characterized in that, described heater is one can heat and change simultaneously the lateral type induction heater of the temperature rise on the width of this rolling stock.
(15) hot-rolling arrangement of the steel plate of a kind of basis (14) is characterized in that, described lateral type induction heater is at least two different lateral type induction heaters of iron core (core body) width on this width.
(16) a kind of material behavior that is used on width does not have the hot-rolling arrangement of the steel plate of variation, this hot-rolling arrangement has a bar plate heating stove, one roughing mill and a finishing mill, the hot-rolling arrangement of described steel plate is characterised in that, have the lateral type induction heater at the center that can only heat steel plate and can heat this steel plate whole width and can make the lateral type induction heater of the temperature rise of edge greater than the temperature rise of center.
(17) a kind of basis (16) is used for the hot-rolling arrangement that material behavior on the width does not have the steel plate that changes, it is characterized in that, at least one can only heat the width unshakable in one's determination of lateral type induction heater at center of this steel plate 400 in the scope of 700mm, and at least one temperature rise that can heat the whole width of this steel plate and can make edge greater than the width unshakable in one's determination of the lateral type induction heater of the temperature rise at this center 800 in the scope of 2500mm.
(18) one groups of equipment of hot rolling, it is characterized in that, on the longitudinal direction between a roughing mill and the finishing mill, set gradually a lateral type induction heater and that is used for the whole width of eddy-current heating one rough bar and can wipe out the front end of this rough bar and the cutter of tail end.
(19) one groups of equipment of hot rolling, it is characterized in that, on the longitudinal direction between a roughing mill and the finishing mill, set gradually the lateral type induction heater that the cutter and that can wipe out the front end of a rough bar and tail end is used for the whole width of this rough bar of eddy-current heating.
(20) a kind of hot-rolling method, it is characterized in that, use one group of equipment of hot rolling, and use one of the front end of this rough bar of described lateral type induction heater heating distance and tail end or both ends to be no more than at least one part of 1m according to claim 18 or 19.
(21) hot-rolling method of a kind of basis (20) is characterized in that, by the heating temperature of one of the front end of this rough bar and tail end or both temperature drops part that raises, thereby reduces the amount of wiping out of this rough bar.
(22) a kind of hot-rolling arrangement of steel plate, this hot-rolling arrangement has a heating furnace that is used to heat slab, one roughing mill and that is used for this slab of roughing is used for the finishing mill of the rough bar of this process roughing of finish rolling, the hot-rolling arrangement of described steel plate is characterised in that, between this roughing mill and this finishing mill, be provided with the big and lateral type induction heater vertically respect to one another of the temperature rise that to heat the center that makes this steel plate, and have a leaning device that is used to make the top of described lateral type induction heater or bottom or both to tilt along the width of this roll line.
(23) a kind of hot-rolling arrangement of steel plate, this hot-rolling arrangement has a heating furnace that is used to heat slab, one roughing mill and that is used for this slab of roughing is used for the finishing mill of the rough bar of this process roughing of finish rolling, the hot-rolling arrangement of described steel plate is characterised in that, width along this roll line is provided with a plurality of lateral type induction heaters vertically respect to one another between this roughing mill and this finishing mill, and has the output controller that can regulate the output of this lateral type induction heater.
(24) a kind of hot-rolling arrangement of steel plate, this hot-rolling arrangement has a heating furnace that is used to heat slab, one roughing mill and that is used for this slab of roughing is used for the finishing mill of the rough bar of this process roughing of finish rolling, the hot-rolling arrangement of described steel plate is characterised in that, between this roughing mill and this finishing mill, be provided with lateral type induction heater vertically respect to one another, and have one and be used to change the barricade extracted of described lateral type induction heater with respect to the magnetic flux of the width of this roll line.
Description of drawings
Fig. 1 is the sketch plan of hot-rolling arrangement of the continued operation of a routine.
Fig. 2 is the sketch plan of the endless rolling device of a routine.
Fig. 3 is the view that is used for illustrating the temperature profile of slab on width that is reheated at heating furnace, wherein (a) is the view that has the state of low temperature part at the center of the thickness of slab, (b) is the view that there is the state of low temperature part in center on the width of slab.
Fig. 4 is the view that is used to illustrate the temperature profile on the width of steel plate after roughing and finish rolling, wherein (a) is the view of rough bar, (b) being view at the temperature profile on width after the roughing, (c) is the view at the temperature profile on width after the finish rolling.
Fig. 5 is the view of the temperature profile on the width of steel plate after the finish rolling, wherein (a) is the view of the temperature profile on the width of slab, (b) be the view of the temperature profile on the width of rough bar, (c) be the view of the temperature profile on the width of steel plate after the finish rolling.
Fig. 6 is using an edge heater to carry out the view of the temperature profile on the width under the situation of hot rolling after heating two edges of rough bar, wherein (a) is the view of the temperature profile on the width of slab, (b) be by the view of the temperature profile on the width of the rough bar of edge heater heating, (c) be the view of the temperature profile on the width of steel plate after the finish rolling.
The view of the temperature profile on the width when Fig. 7 carries out hot rolling after use one solenoid type induction heater heats a rough bar, wherein (a) is the view of the temperature profile on the width of slab, (b) be by the view of the temperature profile on the width of the rough bar of edge heater heating, (c) be the view of the temperature profile on the width of steel plate after the finish rolling.
Fig. 8 is the view that is used to illustrate the lateral type induction heater.
Fig. 9 is the view that the example of lateral type induction heater is set, and wherein (a) illustrates the example that the identical lateral type induction heater of three width unshakable in one's determination is set, and the example that the different lateral type induction heater of two width unshakable in one's determination is set (b) is shown.
Figure 10 is the view that is used to illustrate temperature profile on the width when using the identical lateral type induction heater rising temperature of three width unshakable in one's determination.
Figure 11 (a) be the high-tensile-strength steel of 600Mpa hot-rolled temperature (℃) and hole expansibility between the view of relation, and Figure 11 (b) be the high-tensile-strength steel of 600Mpa hot-rolled temperature (℃) and percentage elongation EL (%) between the view of relation.
Figure 12 moves a plurality of bar heaters and when steel plate heated on the width of steel plate, the schematic diagram of the temperature rise on width.
Figure 13 is the view of the improvement of the Distribution of temperature rise figure on the width that forms because of the bar heater and the temperature difference on the width.
Figure 14 is used for illustrating at the view that move of example bar heater on width.
Figure 15 is the view that is used for illustrating the difference of the temperature rise determined by the bar heater in example and temperature rise.
Figure 16 is the view of the improvement of the temperature difference on the width of example light plate.
Figure 17 is corresponding to the view of (a) the displacement situation to the width of the heat run of (e) in example.
Figure 18 is the view that the example of the different lateral type induction heater of two width unshakable in one's determination is set.
Figure 19 is the view of the Distribution of temperature rise figure of a lateral type induction heater and an edge heater, wherein (a) is the view of the Distribution of temperature rise figure of the less lateral type induction heater of a width, (b) be the view of the Distribution of temperature rise figure of the bigger lateral type induction heater of a width, (c) be the view of total Distribution of temperature rise figure of two lateral type induction heaters, (d) be the view of the Distribution of temperature rise figure of an edge heater.
Figure 20 is the view that is used to illustrate the temperature profile of the front portion of a rough bar before rolling.
Figure 21 is the view that is used to illustrate the temperature profile at the middle part of a rough bar before rolling.
Figure 22 (a) is the view that is used to illustrate the temperature profile of the afterbody of a rough bar before rolling.
Figure 22 (b) is the temperature difference of a finishing mill feed side and through the view of the relation between the difference of the percentage elongation of the steel plate of finish rolling.
Figure 23 is the perspective view of lateral type induction heater of the present invention.
Figure 24 is the schematic diagram of one group of equipment of hot rolling of the present invention.
Figure 25 is the perspective view of the faradic situation that generates in the rough bar when using the lateral type induction heater, wherein (a) be illustrated in rough bar foremost near situation, (b) situation of stable state part is shown.
Figure 26 is at the view of the front end of rough bar and near the temperature rise situation the tail end when using the lateral type induction heater.
Figure 27 (a) is the view in the clipped position at the front end place of a rough bar, (b) is near the view of the clipped position tail end.
Figure 28 is at the front end of next the rough bar of situation that exist/does not have the heating of lateral type induction heater and near the view of the rough bar temp the tail end, wherein (a) is the view of the front end temperature of this rough bar, (b) is the view of the tail end temperature of this rough bar.
Figure 29 is the perspective view of the solenoid type induction heater of a routine.
Figure 30 is asymmetric this true view of temperature that is used to illustrate on the width of this slab when using heating furnace heating slab.
Figure 31 is the view that is used for illustrating the temperature profile on the width of the slab that heating furnace is reheated, wherein (a) is the view that there is the situation of low temperature part in the center that is illustrated in slab, (b) is to be illustrated in the view that temperature profile on the width of slab is asymmetric and have the situation of low temperature part at the center of width.
Figure 32 is the view of the temperature profile on the width of steel plate after roughing and the finish rolling, wherein (a) is the view of a rough bar, (b) being the view of the asymmetric temperature profile in the left and right sides on width after the roughing, (c) is the view of the asymmetric temperature profile in the left and right sides on width after the finish rolling.
Figure 33 is the view of the temperature profile on the width when using an induction heater heating of moving and hot rolling one rough bar on width, wherein (a) is the view of the temperature profile on the width of a slab, (b) being by at mobile induction heater on the width and the view of the temperature profile of heated rough bar on width, (c) is the view of (use the rolling back of finishing mill steel plate on width) temperature profile.
Figure 34 is when when making a lateral type induction heater tilt to change clearance distance, the view of the relation between this gap and the temperature rise.
Figure 35 is the view that the example of the different tiltable lateral type induction heater of two width unshakable in one's determination is set on roll line.
Figure 36 is the view of the Distribution of temperature rise figure of lateral type induction heater, wherein (a) is the view of the Distribution of temperature rise figure of the less lateral type induction heater of width, (b) be the view of the Distribution of temperature rise figure of the bigger lateral type induction heater of width, (c) be the view of total Distribution of temperature rise figure of two lateral type induction heaters.
Figure 37 is the view that is used to illustrate the leaning device of a lateral type induction heater.
Figure 38 is used to illustrate the view that the temperature rise on the width of lateral type induction heater is controlled.(a) be to utilize a plurality of views that are arranged on the example of the lateral type induction heater rising temperature on the width, (b) be on width, the iron core of a lateral type induction heater to be divided into a plurality of parts and to utilize the raise view of example of temperature of these parts, (c) be the view that control is arranged on the example of the heating of a plurality of lateral type induction heaters on the width and temperature rise, and (d) be that the view of a barricade with the example that changes the magnetic flux between this a lateral type induction heater and the rough bar is set.
The specific embodiment
First embodiment:
Known to obtaining on width, to have predetermined material behavior, promptly the material on the width (characteristic) not have to change hot rolled steel plate the time, must make the temperature profile on the width of the rough bar of finishing mill feed side keep even.In the past, thought once that if the temperature of the temperature drop part at two edges of the rough bar that uses an edge heater to raise to cause, then the temperature profile on the width of this rough bar will become even when roughing.
But, using an edge heater can be changed by the material behavior of the hot rolled steel plate of finish rolling on width after heating two edges of rough bar.
Therefore, the inventor has carried out various experiments to seek reason, found that reason is present in when heating slab in heating furnace.
That is, because heating furnace heats slab under high-temperature atmosphere, so shown in Fig. 3 (a), heated slab 2 circumferentially comprises the highest part of temperature 14 at it, but there is a low temperature part 13 in the center on the width that comprises 1/2 width inevitably.In addition, if measure temperature profile on the surface of this slab of roughing mill feed side, shown in Fig. 3 (b), then the temperature of the center of center line (CL) (1200 ℃) is lower than the mean temperature on the width, and towards the edge time temperature become higher (1230 ℃).
Shown in Fig. 4 (a), if roughing has the slab of this temperature profile in a roughing mill, then because two edges of rough bar 4 are parts 15 of significantly cooling off naturally, shown in Fig. 4 (b), the temperature profile of this rough bar is lower than the mean temperature on the width in the temperature (1033 ℃) of the center of 1/2 width of center line, temperature between this center and this edge higher (1056 ℃), and in temperature lower (1002 ℃), thereby to the temperature profile of a M shape up to distance 100mm place, two edges.If finish rolling has the rough bar of this temperature profile, then shown in Fig. 4 (c), though steel plate because finish rolling and attenuation also can keep this M shape temperature profile, the final temperature at center is 842 ℃, the temperature of mid portion the highest (865 ℃), and the temperature at edge is 800 ℃.
Fig. 5 (a) and (b) and (c) shown in above-mentioned after using heating furnace to heat slab, the rough bar after the roughing and at the temperature profile of steel plate on width of finishing mill exit side.In each case, all obtain M shape temperature profile on the width.
In conventional hot-rolling method, use an edge heater to heat the situation at the edge of rough bar with reference to Fig. 6 explanation below.
Shown in Fig. 6 (a), the temperature profile of the surface of a slab on its width is such temperature profile before carrying out roughing, and wherein, the temperature at the center of center line (CL) is 1200 ℃, and is elevated to 1230 ℃ towards lip temperature.If use two edges that an edge heater heats this rough bar temperature drop with two edges of the rough bar that compensates this process roughing, then shown in Fig. 6 (b), temperature at dashed area raises, thereby the temperature of two edges is elevated to 1056 ℃.But the temperature (1033 ℃) of center low temperature part does not raise, so the temperature profile on the width is inhomogeneous.In the past, this state is considered to the even temperature distribution map on the width of rough bar.
If the rough bar that utilizes an edge heater to heat two edge is carried out finish rolling, even then this steel plate attenuation still can keep temperature profile on the width of this rough bar.Shown in Fig. 6 (c), the temperature profile on the width of this hot rolled steel plate of finishing mill exit side is that the temperature of center (842 ℃) is lower than the mean temperature on the width.
Below, with reference to Fig. 7 the lateral type induction heater situation of this rough bar of heating as the heater of rough bar and on the whole width of rough bar of using is described.
Temperature profile shown in Fig. 7 (a) on the width of this slab.Shown in Fig. 7 (b), the center low-temp. portion that has the temperature profile of rough bar on its width that the slab of this temperature profile obtains by roughing is divided into 1033 ℃, and the maximum temperature of mid portion is 1056 ℃, and lip temperature is 1002 ℃.If use a solenoid type induction heater evenly to heat this rough bar on width, then the final temperature at center is 1046 ℃, and the temperature of mid portion is 1069 ℃, and the temperature at edge is 1015 ℃.But in the case, the temperature profile on the width is similarly a M shape temperature profile.Therefore, if use the rolling rough bar that is evenly heated by the solenoid type induction heater of a finishing mill on its whole width, then shown in Fig. 7 (c), the temperature profile that can obtain on the width is the hot rolled steel plate of M shape.
Illustrate as mentioned, the discovery that the inventor must make new advances, promptly be heated the slab of stove heating when hot rolling, and adopt and in the operation of rolling, use edge heater to heat the conventional method at two edges of rough bar, or use the solenoid type induction heater to heat rough bar so that when on width, raising its method of temperature equably, opposite with the idea of routine, temperature profile on the width of the steel plate of finishing mill feed side must not be that result's material behavior on the width of hot rolled steel plate can change uniformly.
In addition, also find since use heating furnace heating slab and when rolling the edge to cool off the temperature profile of rough bar on width that causes naturally inhomogeneous, be the reason that causes the changes in material properties on the width of steel plate.
Therefore, in the present invention, the temperature profile on the width that makes rough bar for feed side and exit side at finishing mill is even, changes temperature rise on the width so that the temperature profile of this rough bar on width is even.At this moment, preferably heat rough bar so that the temperature rise that comprises the center low temperature part on the steel plate width of 1/2 width at least greater than the temperature rise of the mid portion (comprising 1/4 width and 3/4 width) between the center on the width and two edges, more preferably, begin the temperature that raises in the low temperature at two edges on width part (there is 100mm at the two ends from the width towards the center of width at least) from the mid portion of steel plate width, thereby make the temperature profile of rough bar on width even.Should point out, in the present invention, on the width of rough bar or other rolling stock " " center " or " center low temperature part " be meant in the zone at the width center of steel plate, and this zone comprises the low temperature position of maximum temperature 1/2 width in the temperature profile on the above-mentioned width of distance.In addition, " mid portion " on the steel plate width is meant this zone: remove " the " center "; but comprise maximum temperature part in the temperature profile on the width, and comprise the position of (apart from this maximum temperature) 1/4 width and 3/4 width on the above-mentioned width.
For heater, can use anyly provides temperature and the heater of Distribution of temperature rise figure width that towards end reduce on very high at the center.Can use the gas heater of concentrating the center that is arranged on width, perhaps can only add the electric heater of thermal center (-tre), but most preferably use the lateral type induction heater to heat.That is, though the cost of investment of gas heater is not high, the surface of (using gases heater) rough bar forms oxide layer easily.In addition, if produce spark between rough bar and the electrode, then electric heater may make in the rough bar and crackle occur.The difference of lateral type induction heater and solenoid type induction heater is, it has can be according to width unshakable in one's determination and the privileged site on width heats the characteristic of rough bar equably, if thereby the lateral type induction heater of a plurality of width less than the width of rough bar is set along roll line, and use the lateral type induction heater of two or more its width together less than the width of rough bar, then can heat the privileged site on the needed width.In addition, as shown in Figure 8, the lateral type induction heater is made up of the coil 19 that is wrapped on unshakable in one's determination 18.This heater can be arranged on the top and following position of steel plate 18, thus easy operating.Owing to can on the surface of rough bar, not cause crackle and can not make the surface overheated, so without limits for the setting of relevant roughing mill, descaler and other device.
Below, the present invention will be described with reference to the accompanying drawings.
In hot-rolling arrangement shown in Figure 1,, between roughing mill and finishing mill, be provided with an induction heater and an edge heater so that form a hot-rolling arrangement as schematically showing among Fig. 9 (a).Place a feed side width thermometer 22 with as the width temperature monitoring at the feed side of three lateral type induction heaters 23,24 and 25, the width unshakable in one's determination of these three heaters is basic identical less than width and its width unshakable in one's determination of rough bar, places an exit side width thermometer 26 at exit side simultaneously.Use the rough bar 4 of conveying roller along direction of arrow conveying one rolling mistake in roughing mill.Use this feed side width thermometer 22 to measure temperature profile on the width of these rough bars 4, and, determine because the temperature rise of the rough bar that the heating of lateral type induction heater 23,24 and 25 causes by the temperature rise controller according to the temperature profile on the width.Utilize near lateral type induction heater 23 this rough bar of heating this center low temperature part, use lateral type induction heater 24 comprising that near the mid portion 1/4 width at this center heats this rough bar then, use lateral type induction heater 25 comprising that near the mid portion 3/4 width at this center heats this rough bar then.In addition, use two edge low temperature parts (there is the part of 100mm end at least from the width direction towards the steel plate center) of the rough bar of an edge heater 6 heating, and make its temperature rising (greater than the temperature rise of the mid portion on the width).The amount that adds heat and temperature rise is controlled by the temperature rise controller.The width thermometer 26 of use exit side is measured the temperature profile of rough bar on width after the heating.When the temperature profile on the width that the width thermometer measure by exit side goes out is inhomogeneous, measurement data is fed back to the temperature rise controller of lateral type induction heater 23 and edge heater 6.Then, the controller control heater is to change the output of temperature rise, so that the temperature profile on the width of this rough bar is even.In order to make the temperature profile on the width even, most preferably be that the temperature difference in the temperature profile on the width is reduced to 0 ℃, but in the present invention, if the temperature difference in the temperature profile on the width is no more than 10 ℃, preferably be no more than 5 ℃, then also allow.
Here, these a plurality of induction heaters are not to have identical width unshakable in one's determination.Their width unshakable in one's determination can suitably change according to the temperature profile on the width.For example, shown in Fig. 9 (b), the induction heater 24 and 25 among Fig. 9 (a) can be set also, but induction heater 27 and induction heater 23 are set, the width unshakable in one's determination of this induction heater 27 is twices of the width unshakable in one's determination of induction heater 24 and 25.
A plurality of lateral type induction heaters and edge heater must not be confined to Fig. 9 (a) and (b) shown in be provided with the order, if but consider overall Controllable Temperature, preferably its position is close.
Should point out, one as mentioned above width thermometer preferably is set as temperature monitoring near the lateral type induction heater, but a device that is used to monitor the temperature profile on the width can be set also at the feed side of lateral type induction heater, this device is according to the internal temperature of heating furnace, the board briquette of the exit side of heating furnace, near and conveying situation (the roughing situation of the rough bar other temperature measured and the arrival induction heater, transporting velocity, time from the heating furnace to the induction heater etc.) carry out numerical computations, to carry out described monitoring.Perhaps, a width thermometer can be set with the temperature profile on the width of the feed side of monitoring lateral type induction heater at the exit side of finishing mill.
Below the example of the temperature characteristic of a lateral type induction heater will be described according to Figure 10.
Figure 10 (a) to (c) is illustrated in the temperature profile of the rough bar 4 that heats under the situation of using the identical heater 23,24 of three width unshakable in one's determination and 25 and form.Figure 10 is with raise the equably example of maximum 40 ℃ situations of the temperature of rough bar corresponding to the width unshakable in one's determination of heater.Should point out that during away from width unshakable in one's determination, temperature rise descends gradually.
Three formed temperature profiles of lateral type induction heater are summations of three temperature rises, therefore as shown in Figure 10 (d), heater 23,24 and 25 temperature rise 28,29 and 30 overlaids, thus the level and smooth peak shape Distribution of temperature rise figure that a temperature rise on width changes obtained.
Therefore, total temperature rise (40 ℃) by three lateral type induction heaters as shown in Figure 10 (e), can make that to have the center minimum temperature be that the maximum temperature of 1060 ℃ and mid portion is that the rough bar of 1100 ℃ M shape temperature profile obtains the even temperature distribution map, wherein the central temperature on the width is 1100 ℃.In addition, use two edges of edge heater heating, thereby the temperature rise of edge heater 16 can make the temperature at edge raise.As a result, can make the temperature difference on the width of rough bar even, this temperature difference is reduced to and is no more than 5 ℃.Like this, difference in the resulting material behavior (for example, tensile strength TS) is reduced to and is no more than 5%.
Should point out that the width unshakable in one's determination of the lateral type induction heater that the width that uses among the present invention is the narrowest preferably arrives in the scope of 700mm 400.Its reason is that the typical plate of hot rolled steel plate is wide to be 550 to 800mm, and therefore in order to reduce the edge heating and to add the thermal center (-tre), the width of lateral type induction heater is necessary than this width little 100 to 150mm.
In addition, hereinbefore, this example is illustrated: when the material on obtaining width (characteristic) does not have the hot rolled steel plate of variation, make at the temperature profile of rough bar on width of finishing mill feed side even.But on the contrary, obtain the different steel plate of material behavior on the width, can heat according to the material behavior on the width certainly so that produce the temperature difference on the width.
Second embodiment:
In addition, the inventor also finds, if carrying out finish rolling with before producing characteristic difference on the width at steel band, the especially reaming characteristic special steel plate different with elongation property, carry out finish rolling so that have the temperature difference on the width of steel plate, then by hot rolling, the reaming characteristic of steel plate is utilized this hot finishing temperature and is improved effectively.
For example, when the high-tensile steel band that will comprise 0.09 to 0.11% carbon, 1.30 to 1.50% silicon, 1.25 to 1.45% manganese, be no more than 0.010% phosphorus and be no more than the 590MPa grade of 0.002% sulphur was applied to crossbeam or other automobile component, this part intercepted on the width of this steel band.From the shape (drawing) of this part, main processing is to carry out ream forming near the width center of strip coil, and carries out punching stretch at 1/4 width of steel band to the edge of whole width and be shaped.
In this processing, for ream forming, the hole expansibility of steel band must be not less than 70%, preferably is not less than 80%.Be shaped for punching stretch, the extensibility of steel band must be at least 31%, preferably is at least 34%.
Below research is used to obtain the condition of above-mentioned mechanical performance.
Figure 11 (a) be the high-tensile steel band of 590Mpa grade the hot finishing temperature (℃) and hole expansibility (%) between the view of relation, and Figure 11 (b) be the high-tensile steel band of 590Mpa grade the hot finishing temperature (℃) and percentage elongation EL (%) between the view of relation.Shown in Figure 11 (a), along with the rising of hot finishing temperature, the hole expansibility of steel band also increases, but shown in Figure 11 (b), along with the rising of hot finishing temperature, the percentage elongation of steel band reduces.That is, with respect to the hot finishing temperature, reaming characteristic and elongation property present opposite tendency.
Therefore, from Figure 11 (a), as seen, be at least 70%, require the hot finishing temperature to be at least 878 ℃ shown in the arrow in order to make hole expansibility.In addition, from Figure 11 (b), as seen, be at least 31%, require this temperature to be no more than 860 ℃ shown in the arrow in order to make percentage elongation.As seen both required temperature ranges are different.The steel band that is had this two specific character simultaneously need be controlled at the hot finishing temperature in 860 to 880 ℃ the very narrow scope (hatched scope).But it is very difficult satisfying this temperature conditions, and, even satisfy this temperature conditions, because the characteristic of target material must not obtain this two specific character yet.
In the present invention, by specifying at least 20 ℃ at the center (elevating the temperature) of heating width of steel band so that the different hot finishing condition of the hot finishing temperature of steel band on width, can obtain near the center of width of steel band, being at least 870 ℃ hot finishing temperature, be no more than 860 ℃ hot finishing temperature to whole widthwise edges place at 1/4 width of steel band with obtaining, can find, can easily produce different " the special steel bands " of mechanical performance on the width, thereby make near the hole expansibility in center of width of steel band surpass 70%, and arrive the percentage elongation at whole widthwise edges place above 31% at 1/4 width of steel band.
But, produce the uniform steel plate of material behavior on the width, perhaps the special steel plate that the material behavior on the width is different does not need heater, promptly, up to the present also nobody proposes freely to control the temperature profile of steel plate on width, so that the temperature profile on the width evenly or effectively makes the different heater of temperature on the width.
The inventor has furtherd investigate the method and apparatus that can freely control the heating steel plate of the temperature profile on the steel plate width direction, and find, by on vertical (roll line) of steel plate, a plurality of bar heaters of being made up of the lateral type induction heater being set, move on the width this bar heater be controlled at steel plate vertically on the lap of bar heater, and operate this bar heater and heat this steel plate, then can freely control the temperature profile on the width.
Figure 12 (a) be on the width of steel plate, be provided with a bar heater with and the view of temperature rise, and Figure 12 (c) to (e) be when steel plate vertically on three bar heaters are set and make this bar heater view of the temperature rise on the width of steel plate during mobile scheduled volume on width.
Shown in Figure 12 (a), if a bar heater (lateral type induction heater) is set at the center of steel plate 21 and operates this bar heater to heat this steel plate, then the Distribution of temperature rise Figure 23 on the width of this steel plate becomes the peak shape Distribution of temperature rise figure of a width corresponding to this bar heater (width unshakable in one's determination).If steel plate vertically on three bar heaters with this temperature characteristic are set, and make this bar heater on the width of steel plate mobile scheduled volume (with the datum mark of the center on the width as displacement, the situation that also comprises zero shift), for example, Figure 12 (b) illustrates the example that displacement is zero situation, these three bar heaters are overlapping fully, therefore the temperature rise addition of three bar heaters, center Distribution of temperature rise figure at the width of steel plate is very high, shown in the bottom of this figure.Figure 12 (c) illustrates does not have the bar at Mobility Center place heater, and make the example of these two situations about moving round about at the bar heater in upstream side and downstream, reduced the lap of bar heater so a little, thereby the temperature rise of these three heaters addition under the state of its generation certain displacement amount, and shown in the bottom of this figure, Distribution of temperature rise figure become one on the width of steel plate the peak shape curve of broad, and Figure 12 (d) illustrates and makes these two in the displacement of the bar heater in upstream side and the downstream example greater than the situation of the displacement among Figure 12 (c), thereby further reduce the lap of bar heater, so the Distribution of temperature rise figure of these three bar heaters becomes a peak shape curve wideer than the distribution map among Figure 12 (c).In addition, mobile generally bar heater is shown Figure 12 (e) so that they have the example of the situation of certain intervals on width, with the lap of eliminating the bar heater and heat whole width, thereby Distribution of temperature rise figure becomes the peak shape curve of a width greater than the width of the distribution map among Figure 12 (c).
Should point out that the bar heater that is subjected to displacement is not limited to downstream bar heater.Can move any bar heater to obtain similar Distribution of temperature rise figure.In above-mentioned example, the example of three bar heaters is shown, if but further increase the quantity of bar heater, then can improve total temperature rise and can accurately control Distribution of temperature rise figure on the width of steel plate.Promptly, because can on the width of steel plate, move a plurality of (two or more) bar heater, and by moving the distribution map that can change the temperature rise load of steel plate on width, so can improve the temperature in any zone on the width of steel plate, and can control the temperature profile on the width.In addition, can during hot rolling, move this bar heater.In addition, can use the combination of the bar heater that width is identical and/or width is different.In addition, these a plurality of bar heaters can change the distance between iron core in heat or the strip coil of adding of bar heater independently, thereby can further improve the controllability of temperature.
For example, will illustrate below when temperature when the center of steel plate (rough bar) is low, and use three identical bar heaters of width to reduce the example of the temperature difference on the width.
Shown in Figure 13 (a), width is that the temperature profile of rough bar on width of 1500mm is M shape figure, the temperature of the center (than two edges) low 40 ℃ (shown in dotted line).Therefore,, and make the temperature profile on the width even, can use three bar heater heating and its temperature that raises (hatched area is temperature rise) for the temperature that makes the steel plate center in an inverted M shape curve raises 40 ℃.Total temperature rise (being illustrated by solid line) of three bar heaters must be a mild peak shape Distribution of temperature rise figure (inverted M shape), and its central temperature (than two edges) is high 40 ℃.In order to obtain this Distribution of temperature rise figure, shown in Figure 13 (b), make the iron core distance of these three bar heaters all identical with temperature rise.In the bar heater (No.1 to 3) that three width are 600mm, two bar heaters (No.1 and No.3) move ± 150mm with respect to the center (distance of broad ways is the position of 750mm) of width, and are used to heat steel plate.Promptly, distance on the width be 600mm to the position of 900mm (with respect to the center of width for ± 150mm) be the unshakable in one's determination overlapping position of the bar heater of all No.1 to 3, distance on the width be 450mm to the position of 600mm (with respect to the center of width for-300mm to-150mm) be the unshakable in one's determination overlapping position of two bar heaters of No.1 and 2, and the distance on the width be 750mm to the position of 900mm (center with respect to width is+150mm to+300mm) be the unshakable in one's determination overlapping position of two bar heaters of No.2 and 3.As a result, the Distribution of temperature rise figure of bar heater (No.1 is to No.3) forms a mild peak shape curve.These three total temperature rises of heater are peak shape Distribution of temperature rise figure, and the temperature of the center (than the edge) is high 40 ℃.
The method of determining the temperature rise of steel plate is, will be by the width of steel plate (rough bar), moving and being stored in the computer by the bar heater by the heating curves of the determined bar heater of the temperature rise of bar heater on width, use is arranged on the temperature profile of width thermometer monitoring steel plate on width of the upstream side of bar heater, select needed immediate displacement and temperature rise with the temperature difference in the temperature profile on heating (compensation) width, and these information are indicated to displacement (overlapping part of bar heater) and the heating of an electric timer to set the bar heater.Like this, can make the temperature in any zone on the width of the steel plate scheduled volume that raises.
For the method for mobile bar heater, this bar heater can be arranged on the trailer that can slide in orbit with promoting, and use drive unit to move this trailer so that on the width of steel plate, move this bar heater.In addition, can raise and reduce the bar heater of upper and lower to regulate the gap between the bar heater.
The 3rd embodiment:
In the hot-rolling arrangement shown in Fig. 1, be provided with two lateral type induction heaters 2 with different width unshakable in one's determination, promptly a width unshakable in one's determination is greater than the lateral type induction heater 23 of the width of rough bar 4 and a width unshakable in one's determination lateral type induction heater 24 less than the width of this rough bar, and be provided with an edge heater 6, to form a hot-rolling arrangement.
Feed side at two different lateral type induction heaters of width unshakable in one's determination is provided with a feed side width thermometer 22, and is provided with an exit side width thermometer 25 at exit side.Use conveying roller to carry through the rolling rough bar 4 of a roughing mill along the direction of arrow.Use this feed side width thermometer 22 to measure temperature profile on the width of these rough bars 4, according to the temperature profile on this width, use the temperature rise controller to determine then because the temperature rise of caused this rough bar of heating of lateral type induction heater 23,24.In addition, use the bigger lateral type induction heater 23 of this width on the whole width of rough bar, to heat this rough bar, but especially heat two end low temperature parts so that their temperature raises, use the less lateral type induction heater 24 of this width only to heat this center low temperature part then.
In addition, when using the bigger lateral type induction heater of this width that the temperature of two (end) low temperature parts of rough bar is fully raise, then can use this this low temperature part of edge heater 6 heating in addition so that its temperature raises as required.The temperature profile that uses this exit side width thermometer 25 to measure on the width that heats the rough bar in back.When the temperature profile on the width that is measured by this exit side width thermometer 25 is inhomogeneous, measurement data is fed back to the temperature rise controller of lateral type induction heater.This controller control heater is to change the output of temperature rise, so that the temperature profile of rough bar on width is even then.In order to make the temperature profile on the width even, most preferably be that the temperature difference in the temperature profile on the width is reduced to 0 ℃, but in the present invention, the temperature difference in the temperature profile on the width is no more than 10 ℃, preferably is no more than 5 ℃ and allows.The lateral type induction heater of this less width and big width and the order that edge heater must not be confined to this setting, if but consider whole Controllable Temperature, preferably its position should be close.
Should point out, one as mentioned above width thermometer preferably is set as temperature monitoring near the lateral type induction heater, but a device that is used to monitor the temperature profile on the width can be set also at the feed side of this lateral type induction heater, this device is according to the internal temperature of heating furnace, the board briquette of the exit side of heating furnace, near and conveying situation (the roughing situation of the rough bar other temperature measured and the arrival induction heater, transporting velocity, time from the heating furnace to the induction heater etc.) carry out numerical computations, to carry out described monitoring.Perhaps, a width thermometer can be set at the exit side of finishing mill and monitor temperature profile on the width of feed side of lateral type induction heater.
Below, the example of the temperature characteristic of lateral type induction heater will be described according to Figure 19.
Figure 19 (a) and the different lateral type induction heater of (b) schematically illustrated use width heat the temperature profile of formed rough bar.(a) temperature profile for the temperature rise 26 of the lateral type induction heater of a narrower width is shown, this induction heater uses the lateral type induction heater 24 of a width unshakable in one's determination less than the width of the rough bar shown in Figure 18, and (b) temperature profile for the temperature rise 26 of the lateral type induction heater of big width being shown, this induction heater uses the lateral type induction heater 23 of a width unshakable in one's determination greater than the width of the rough bar shown in Figure 18.
Shown in Figure 19 (a), the lateral type induction heater 24 with iron core of narrower width makes the temperature at rough bar center raise maximum 40 ℃ equably according to this iron core width.In addition, outside this iron core width because temperature is to raise by heat conduction, thus temperature rise reduce gradually, thereby form level and smooth peak shape Distribution of temperature rise figure.
In addition, shown in Figure 19 (b), its width unshakable in one's determination can make the temperature of the whole width of rough bar raise maximum 40 ℃ greater than the lateral type induction heater 23 of the width of rough bar, and because bigger this characteristic of electric current of two edges of rough bar can make the temperature at two edges of about 150mm raise maximum 150 ℃.
Therefore, as shown in Figure 19 (c),, can make the temperature profile on the width of rough bar even by total temperature rise of two lateral type induction heaters 23,24.In addition, by the different lateral type induction heater of a large amount of width being set along roll line and using these heaters together, can fine regulate the Distribution of temperature rise figure of rough bar.In addition, add heat and temperature rise by changing the output of lateral type induction heater, can changing.
In addition, if use one can heat the edge heater at the edge of 150mm at least, then shown in Figure 19 (d), the temperature rise 16 at the edge of the rough bar that is produced by this edge heater can make the temperature of two edges raise maximum 150 ℃.Therefore, if the lateral type induction heater of big width to two edges add heat and temperature rise is not enough, then preferably, use the temperature at above-mentioned edge heater compensation and these two edges that raise in addition.
Should point out that the width unshakable in one's determination of the lateral type induction heater that the width that uses among the present invention is the narrowest preferably arrives in the scope of 700mm 400.Its reason is that the typical plate of hot rolled steel plate is wide to be 550 to 800mm, and therefore in order to reduce the edge heating and to add the thermal center (-tre), the width of lateral type induction heater is necessary than this width little 100 to 150mm.
In addition, the width unshakable in one's determination of the lateral type induction heater of big width arrives in the scope of 2500mm 800, preferably arrives in the scope of 2000mm 800.Its reason is, the edge adds that heat request (heater) width unshakable in one's determination equals the width of steel plate or than the big 500mm of width of steel plate, therefore, heat steel plate with typical minimum widith in the hot rolled steel plate, be that width is 550 to the steel plate of 800mm, the lateral type induction heater about preferably using width as 800mm, and to heat common hot rolled steel plate, be that width is 1500 to the steel plate of 2000mm, the lateral type induction heater about preferably using width as 2500mm.
The 4th embodiment:
As shown in figure 24, for the heater of the rough bar 201 between heating roughing mill 202 and the finishing mill 203 in course of hot rolling, be to use the heater of the whole width of solenoid type induction heater 231 these rough bars of conduct heating as shown in Figure 29 in the past.The lateral type induction heater is only as the edge heater that heats the edge on the rough bar width.If use the heater of a lateral type induction heater as the whole width of rough bar, then the edge of this heated rough bar is overheated easily, and inductor is complex-shaped, and big electric current can not pass through, and therefore has the problem that is difficult to make high-power device.For above reason, horizontal system is difficult to the device as the whole width of the rough bar of heating.In a solenoid type induction heater 231, coil 232 is provided with around this rough bar 201, and unshakable in one's determination 233 be arranged on the top of rough bar 201 and below.
The present invention adopts a kind of lateral type induction heater 204, this heater is as the heater that the whole width of rough bar 201 is carried out eddy-current heating, so that fully the raising with the temperature of the temperature drop of caudal end part foremost of rough bar 201, and can only the shape defect part be excised as crop.
Shown in Figure 25 (b), when the use one lateral type induction heater 204 that is used for the whole width of rough bar is carried out eddy-current heating as shown in figure 23, and when the part of the stable state in the heating (this bar) vertically rather than front end and tail end, induced-current 222 flow through rough bar 201 very on a large scale, thereby can evenly heat this rough bar vertically.On the other hand, when rough bar vertically on front end and tail end when for example the state as Figure 25 (a) is shown in time passes through heater, promptly, the front end of rough bar 201 is by this lateral type induction heater 204, induced-current 222 flows through concentrating near 223 foremost, and then the temperature rise of 223 (and caudal end) foremost of the rough bar 1 that caused by induced-current 222 of result increases greatly.For example, when using one can make the lateral type induction heater that the temperature of the stable state part of rough bar raises about 30 ℃, shown in the solid line among Figure 26, in the approximately temperature rise increase in the scope of 100mm of 223 (or caudal end) foremost of the rough bar of distance, and the temperature rise of whose forwardmost end portions 223 (or caudal end part) can be above 200 ℃.If use (lateral type induction) heater that can make this stable state temperature partly raise about 60 ℃, then shown in the dotted line among Figure 26, the temperature rise of this rough bar 223 (or caudal end) foremost can be above 400 ℃.
In the present invention, can use lateral type induction heater 4 so that the whole width of rough bar 201 is carried out eddy-current heating, thereby, when the front end of the rough bar 201 of heating and tail end, do not need to stop the motion of rough bar 201.By stable state part this end is passed through with constant speed, can be obtained big temperature rise at front end and tail end as mentioned above with rough bar 201.
Shown in Figure 24 (a), in first embodiment, the setting of hot-rolling arrangement of the present invention comprises roughing mill 202 and finishing mill 203, and between them, set gradually lateral type induction heater 204 and that the whole width that is useful on rough bar 201 carries out eddy-current heating can excise this rough bar vertically on front end and the cutter 208 of tail end.Usually use a crop(ping)shears as cutter 208.In this embodiment, after finishing roughing, at first, then it is cut with cutter 208 with the front end and the tail end of the rough bar of induction heater 204 heating.Should point out that heating furnace 207 is arranged on before the roughing mill 202, and coiling machine 209 is arranged on after the finishing mill 203.
Shown in Figure 24 (b), in a second embodiment, the setting of hot-rolling arrangement of the present invention comprises roughing mill 202 and finishing mill 203, and between them, be disposed with one can excise this rough bar vertically on front end and the cutter 208 and of the tail end lateral type induction heater 204 that is used for the whole width of rough bar is carried out eddy-current heating.Usually use a crop(ping)shears as cutter 208.In this embodiment, after finishing roughing, at first cut the front end and the tail end of rough bar, use induction heater 204 (to bar) to heat then with cutter 208.
As mentioned above, the temperature rise of the rough bar 201 by lateral type induction heater 204 in a longitudinal direction reach the highest with caudal end foremost.Therefore, if after wiping out front end and tail end, heat, then can effectively utilize very much the highest part of temperature rise as the stable state part of not wiped out.
For first embodiment owing to during eddy-current heating, do not shear this rough bar, so when this rough bar foremost or the temperature drop of caudal end than greatly the time, can not fully compensate this temperature drop by eddy-current heating sometimes.On the other hand, in a second embodiment, owing to be to shear this rough bar in the optimum position, carry out eddy-current heating then, so can shear this bar in the optimum position of temperature drop part at the front end of induction heater and the heating efficiency of tail end, as a result, second embodiment compares with first embodiment and can reduce the amount of wiping out sometimes.
If make rough bar bigger at the thickness of finishing mill feed side, and improve finish rolling speed, then can improve the toughness of product by meticulousr structure, therefore, when the increase of rough bar thickness is subjected to the restriction of the shearing moment that cutter allows, then can be as first embodiment, at the rough bar of condition of high temperature down cut, so that relatively improve the permission ability of the shearing moment of cutter, and reduce the toughness that deformation drag further improves product by the rising temperature.
In hot-rolling method of the present invention, use has the hot-rolling arrangement of setting of the hot-rolling arrangement of first or second embodiment, and uses the lateral type induction heater to locate to heat at least a portion that is no more than 1m apart from this end at one of the front end of rough bar and tail end or both.The part that this end is no more than 1m if adjust the distance is carried out eddy-current heating, then can fully heat the temperature drop part of this front end and tail end and its temperature is raise, and can reduce the amount of wiping out.Here, if heated rough bar before shearing, then " end " of the front end of this rough bar and tail end is meant the fishtail trench 216 (fish tail end) of the shape defect 215 shown in Figure 27, the i.e. position of datum mark 217.
Certainly, also can use the entire longitudinal length of identical lateral type induction heater with the rough bar of eddy-current heating.If employing the method even then before roughing slab heating temperature is set at a low value, still can be brought up to optimum temperature with final rolling temperature.
In inside heating furnace, be difficult to change off and on temperature to heat each adjacent slab.Owing to the heating furnace of at low temperatures slab being packed into, with some slabs is that unit makes several 10 ℃ of temperature change, and be higher than target temperature and slab is unloaded from heating furnace, therefore in heating furnace, be heated to above the target unloading temperature waste of material that high temperature around the material that low temperature will inevitably be packed into is packed into, thereby can cause the waste of fuel of heating furnace.Therefore, by using a lateral type induction heater that is used for the entire longitudinal length of the rough bar of eddy-current heating, can pack at low temperature unloads this material when material is in low temperature, thereby has reduced the waste of fuel of heating furnace.
In addition, when at high temperature from heating furnace unloading slab, can generate the secondary oxidation layer, and this oxide layer can be brought into when rolling, thereby can destroy the good looking appearance of final roll coil of strip material on the surface of product.Can reduce power consumption by reducing the bar cooling power, this bar cooling power is used for cooling off the bar surface to guarantee surface aesthetic from roughing to finish rolling the time, perhaps reduce the productivity ratio that causes by the air cooling that is used for the bar cooling and descend and loss, perhaps increase the roughing flow.
In hot-rolling method of the present invention, can heat in this way, so that raise in the temperature of the temperature drop part at one of the front end of rough bar and tail end or both places, thereby and reduce the amount of wiping out of rough bar by heating.
Past, when do not heat rough bar vertically on front end and during tail end, wipe out the front end of this rough bar so that remove temperature drop part except shape defect.That is, among near the Figure 27 (a) the front end 213 that rough bar 201 is shown, shear this bar at the shearing position 219 of routine.
On the other hand, the thickness of hot-rolled coil material and difference after the shearing position of rough bar tail end is according to finish rolling.Be no more than the thin material of 3mm for roll coil of strip material thickness, partly shear at the temperature drop except shape defect, and for the thick material of roll coil of strip material thickness greater than 3mm, no matter the temperature drop state of tail end how, is all sheared at the position of shape defect inside.That is, among the Figure 27 (b) in (zone), thin material is sheared at the shearing position of routine 219a near the tail end 214 that rough bar 201 is shown, and thick material is sheared at the shearing position of routine 219b.At the tail end place of roll coil of strip material thickness, may appear at when shearing and to remove all shape defects, thereby when being rolled, can leave the situation of these parts above the thick material of 3mm.To illustrate below, at input front end and discharge the rear end so that leaving the rolling mode that is rolled in the shape defect, and under this pattern to the influence of the thickness of the roll coil of strip material of product.
When input front end, and when the remainder of the shape defect of steel plate is transfused to working roll, this foremost can replication, thereby can form two-layer (steel plate) and form defective in working roll.This is very tangible, and the degree of defective is bigger when roll coil of strip material is thin, even but when roll coil of strip material was thicker, the scar of the low temperature foremost of steel plate part also can be imprinted on the working roll, and this working roll can be damaged equally.In addition, when staying most of fish tail end or other shape defect after wiping out, the sharp-pointed part of this front end can be clashed into flipper guide, and, can be by the feeding of roughing mill with a kind of folding mode replication between the roughing mill frame.For the above reasons, when input front end, if left over shape defect then be breakneck.
When discharging end, this shape defect will be rolled over by drawing 10 to 20 on rolling direction according to predetermined compression ratio (reduction rate), and the fishtail unstable state part of therefore being given an example will be crossed over a plurality of frames and is rolled.When roll coil of strip material is thin, the caudal end of the difference limit in the draught pressure distribution map that is not subjected to cause by uneven temperature profile on the width, be subjected to torque and on width, reverse, thereby contact and by replication promptly so-called " tail end fold (tail pinching) " with flipper guide.When material was thin, shape defect can break sometimes.This can cause production line to pause with the replacing working roll, thereby has reduced productivity ratio.Therefore, it is breakneck having left over shape defect.
But when roll coil of strip material is thicker (the thick material that surpasses 3mm), this tail end draws and can take place hardly.This be because, steel plate is thick and hard, therefore can replication even contact with flipper guide also not, its compression ratio is less, thereby the fish tail shape unstable state in the roughing mill is partly shorter, load is lower, and torque is less.In addition, even steel billet temperature is low, but steel plate is thick and be difficult to break, and therefore in some cases, is not all removing but leaves rolled plate under the situation of partial shape defective.Preferably, select not add alloy and wait the low ordinary steel of tensile strength that strengthens mechanical performance.In addition, if twine the fish tail shape part of caudal end of the roll coil of strip material of product with belt, then with its binding, then during the conveyer belt coiled material, this belt fluffs sometimes or the fish tail shape that is left partly staves.Preferably, bondage multi-ribbon or at this belt of product width direction adjusted, so that this belt can partly not intersect with the fish tail shape that stays.
Therefore, surpass in the thick material of 3mm,, also can not obtain to reduce the effect of the amount of wiping out at the tail end 214 of rough bar even carry out eddy-current heating of the present invention at roll coil of strip material thickness.That is, be no more than under the situation of 3mm, reduce the amount of wiping out to rough bar (effect) in the hot-rolling method of the present invention at roll coil of strip material thickness after the finish rolling, be applicable to one of the front end 213 of rough bar and tail end 214 or all both.
Lateral type induction heater 204 for the whole width that is used for the rough bar of eddy-current heating that uses among the present invention, as shown in figure 23, preferably use the lateral type induction heater of following type: it has the U-iron heart 5 as iron core 205, this iron core has two vertical components 211 and a horizontal component 212, make these two vertical components 211 point to the surface of rough bar 201, make unshakable in one's determination 5 width can cover the whole width of rough bar 201, with this U-iron heart (205a, 205b) be arranged to upper surface or lower surface towards rough bar 201, and be provided with coil 6 around this vertical component (211a, 211b).Coil 6 around vertical component 211 generates a magnetic field.This magnetic field forms between two opposed U-shaped iron cores to form a loop magnetic field.Because the end face of vertical component 211 unshakable in one's determination toward each other, then at these two end faces be arranged between the rough bar 201 between these two end faces and can generate a magnetic field, this magnetic field vertically forms in the surface of rough bar.Because unshakable in one's determination 205 width can cover the whole substantially width of bar 201, then on the whole substantially width of rough bar 201, can form the magnetic field perpendicular to rough bar 201.Give the coil 206 indirect currents stream around unshakable in one's determination 205, then the magnetic field by rough bar 201 can become an AC magnetic field, and forms a vortex flow as induced-current in this rough bar.
Relation between the width of heated rough bar and unshakable in one's determination 205 the width W be preferably make rough bar width greater than width W unshakable in one's determination.When using the lateral type induction heater, the edge of heated rough bar (end on the width) is overheated easily, but by making the width of width W unshakable in one's determination less than rough bar, can suppress edge overcurrent takes place, thereby it is overheated to suppress the edge.Like this, can evenly heat the whole width of rough bar.
The heating of rough bar and intensification ability change according to the gap between the iron core of the end face of facing this rough bar and bottom surface setting.Narrower gap between the iron core, the temperature rise of the rough bar that is caused by heating is big more.Therefore, the gap between the iron core should be set to narrow as far as possible usually.But the front end 213 of rough bar is a warpage sometimes.If the interferric space of induction heater 204 is very narrow, then the front end of the rough bar of warpage can not enter gap unshakable in one's determination, and may bump.Therefore, when the front end 213 of rough bar entered induction heater 204, interferric space enlarged.After this front end entered, interferric space narrowed down to improve heating and intensification ability.When taking this measure, interferric space is bigger when the front end 213 of rough bar passes through, therefore the heating and the intensification ability of induction heater are low, and the tail end 214 of rough bar by the time interferric space narrow down so the heating of induction heater and intensification ability height.For example, in an induction heater, its tail end of rough bar by the time interferric space be 130mm, and be 500 ℃ to the heating and the intensification ability of caudal end, and the front end of rough bar by the time interferric space expand 340mm to, the result becomes 250 ℃ to heating and intensification ability foremost.
Can connect and a plurality of lateral type induction heaters are set to form a whole full duration induction heater.Each induction heater can have mid power (heating efficiency) to guarantee all required power.Past exists high-power induction heater to be difficult to make this problem, but by the heater of a plurality of mid power is set, can address this problem.In course of hot rolling, have the rough bar that leniently arrives narrow multiple width.The width unshakable in one's determination of a plurality of induction heaters that are provided with by connecting is set to the width unshakable in one's determination for rough bar the best of narrower width, and when the rough bar of hot rolling one big width, make on the width of independent induction heater at rough bar and move respectively, then can heat the whole width of this rough bar.
The frequency of oscillation of lateral type induction heater is preferably about 100 to 500Hz.The solenoid type induction heater uses the frequency of about 1500Hz, but preferably, is about 100 to 500Hz by the frequency that makes the lateral type induction heater, increases the degree of depth that heat penetrates and prevents because the localized heat of himself element is accumulated to cause breaks.
The 5th embodiment:
The known material behavior that will obtain on the width does not have the hot rolled steel plate that changes, must make the temperature profile on the width of the rough bar of finishing mill feed side even.Past, considered temperature by the temperature drop part of using edge heater to raise when the roughing to be formed on rough bar two ends (edge), and the left and right sides in the elimination temperature profile is asymmetric, can make the temperature profile on the width of rough bar become even.
But, when furtheing investigate this, the inventor finds, to eliminate the asymmetric hot rolled steel plate that obtains by finish rolling afterwards in the temperature profile on the width, the material behavior on its width can change in two ends of using edge heater to heat rough bar.
Therefore, the inventor has carried out various experiments to seek reason, found that reason is present in when heating slab in heating furnace.
That is, as shown in figure 30, the temperature that is heated and raises under the high-temperature atmosphere of slab heating furnace preheating section 313 and bringing-up section 314 from loading side along the direction of arrow, and be removed after in soaking zone 315, reaching a predetermined temperature.This heating to slab makes that the heating of the end A of the loading side on the width of this slab is less in heating furnace, and more in the heating of the end of discharge side B.In addition, when opening Dump gate and when soaking zone takes out slab, heated slab is higher than temperature at the end of exit side B in the temperature of the end of feed side A.Therefore, heated slab on width the left side and the temperature on right side differ about 20 ℃ sometimes.In addition, shown in Figure 31 (a), heated slab 2 upwards has high-temperature part 316 in its week, but inevitably therein the heart one low temperature part 317 is arranged.In addition, if measure board briquette distribution map at the roughing mill feed side, shown in Figure 31 (b), the temperature profile left and right sides on (can find) width is asymmetric, wherein the temperature at the center of center line (CL) (1200 ℃) is lower than the mean temperature on the width, and uprises (1240 ℃ and 1220 ℃) towards lip temperature.
If roughing has the slab of this temperature profile in a roughing mill, as shown in Figure 32 (a), because two edges of rough bar are the parts of significantly cooling off naturally 18, then shown in Figure 32 (b), the temperature profile of this rough bar in the temperature (1033 ℃) of centerline less than the mean temperature on the width, and the temperature between center and end higher (1063 ℃ and 1049 ℃), and towards the end region temperature reduction, thereby form a M shape temperature profile.If finish rolling one has the rough bar of this temperature profile, then shown in Figure 32 (c), even this steel plate meeting attenuation because of finish rolling, also can keep this M shape temperature profile, central temperature finally is 842 ℃, the temperature the highest (872 ℃) of the mid portion in left side, and the temperature of the mid portion on right side is 858 ℃.
Below, illustrate that with reference to Figure 33 use one induction heater moves this induction heater to heat the situation of this rough bar as the heater of rough bar and on width.
Figure 33 (a) illustrates the temperature profile of slab on width that unloads from heating furnace.Have the temperature profile of a rough bar on width that the slab of this temperature profile obtains as shown in Figure 33 (b) by roughing one, the temperature that its center low-temp. portion divides is 1033 ℃, and the maximum temperature of left side mid portion is 1063 ℃.If heat this rough bar by on width, moving this induction heater, then the whole temperature rise that is just produced by temperature rise 19 is shown in shade 319, the temperature of this center becomes 1063 ℃, (the highest) temperature of left side mid portion is 1083 ℃, and (the highest) temperature of right side mid portion is 1069 ℃.But in the case, the temperature profile on the width also becomes M shape temperature profile.Therefore, if move this induction heater and use a finishing mill rolling should be on whole width heated rough bar, then shown in Figure 33 (c), can obtain a hot rolled steel plate with the temperature profile on the width of M shape.
Illustrate as mentioned, the discovery that the inventor must make new advances, promptly be heated the slab of stove heating when hot rolling one, and adopted the past during rolling, to utilize edge heater to heat the heating means at two edges of rough bar, or by induction heater is tilted when heating the method for this rough bar at width, opposite with former idea, the temperature profile on the width of this steel plate after the finish rolling is not uniform.
In addition, also find, by the center low temperature part of the slab that is heated stove heating, temperature profile asymmetric on the width, and when rolling the air at edge to cool off these three temperature profiles of rough bar on width that factor caused inhomogeneous, be the vicissitudinous main cause of the material behavior of steel plate on width.
Therefore, in the present invention, use the lateral type induction heater to heat the center low temperature part of rough bar and the low temperature part at two ends, so that the temperature profile on the width of the rough bar of finishing mill feed side is even, simultaneously, by the lateral type induction heater is tilted with heating and rising temperature, and use the temperature of the low temperature part at edge heater compensation and rising two ends as required in addition, so that the temperature profile of rough bar on width is even, thereby the temperature profile on the elimination width is asymmetric.
For the center low temperature heater partly of rough bar, can use any only heater of the temperature of the Distribution of temperature rise figure on center heating and rising width.The lateral type induction heater is different with the solenoid type induction heater, and has the characteristic that can heat equably corresponding to the privileged site on the width of the rough bar of width unshakable in one's determination.That is, its width unshakable in one's determination can heat center corresponding to the steel plate of width unshakable in one's determination less than the lateral type induction heater of steel plate width.In addition, its width unshakable in one's determination can heat the whole width of steel plate greater than the lateral type induction heater of steel plate width, and can make the temperature rise of the temperature rise of (steel plate) end greater than the center.
In addition, the feature of lateral type induction heater is, the gap between temperature rise basic in theory and iron core and the steel plate is inversely proportional to.That is, as shown in figure 34, if lateral type induction heater 320,321 widths at steel plate (direction of arrow) tilt, the then iron core of lateral type induction heater and the space change between the steel plate, and temperature rise also changes.For example, Figure 34 (b) illustrates a lateral type induction heater in the temperature rise example under the following situation: the position shown in the solid line of this lateral type induction heater in Figure 34 (a) is output as 20MW.Be appreciated that from Figure 34 temperature rise reduces if the gap becomes greatly if gap smaller then temperature rise become big.In addition, temperature rise the size basic and gap is inversely proportional to.
Therefore, this lateral type induction heater of tiltable is to change the size in gap, thereby, if heating and rising temperature in according to the temperature profile inclination lateral type induction heater on the width, then add heat and temperature rise on the adjustable width direction, thereby can eliminate the asymmetric of temperature profile on the width.
If the different lateral type induction heater of a plurality of width unshakable in one's determination is set along roll line, and be used in combination at least one its width unshakable in one's determination less than the lateral type induction heater of the width of rough bar and at least one its width unshakable in one's determination greater than the lateral type induction heater of the width of rough bar with heating and rising temperature, then can heat the low temperature part of this rough bar on width, and the low temperature at the two ends part privileged site on width, and can eliminate asymmetric in the temperature profile on the width.In addition, as shown in figure 23, the lateral type induction heater of being made up of the iron core 18 with coil 19 20 is arranged on the top and following position of steel plate (rough bar) 21 usually, so that easy operating.The surface of rough bar can not form crackle, and this surface can be not overheated because of this characteristic yet, and the distance of rough bar and roughing mill, descaler and other device is also unrestricted.
Below, the present invention will be described with reference to the accompanying drawings.
In hot-rolling arrangement shown in Figure 1, as schematically shown in Figure 35 shown in the property, between roughing mill and finishing mill, tiltedly be provided with two lateral type induction heaters that width is different in the width updip of steel plate, be the lateral type induction heater 325 of width unshakable in one's determination greater than the width of rough bar, with the lateral type induction heater 324 of width unshakable in one's determination less than the width of rough bar, and be provided with an edge heater 306, thereby form a hot-rolling arrangement.
Feed side at the different lateral type induction heater of these two width unshakable in one's determination is provided with a feed side width thermometer 326, and is provided with an exit side width thermometer 327 at exit side.Use a bench roller to carry the rough bar 304 that in roughing mill, is rolled along the direction of arrow.Measure the temperature profile of rough bars 304 on width with this feed side width thermometer 326, determine the temperature rise of the rough bar that the heating by lateral type induction heater 324 and 325 causes simultaneously according to the temperature profile on this width.In addition, the lateral type induction heater is tilted with given one predetermined clearance distance.Use the less lateral type induction heater 324 of this width only partly to heat this rough bar at center low temperature, use the bigger lateral type induction heater 325 of this width on whole width, to heat this rough bar then, but especially heat the low temperature part at two ends and its temperature is raise.In addition, when the bigger lateral type induction heater of this width can not make the low temperature temperature partly at the two ends of rough bar fully raise, can use this edge heater 306 heating this low temperature part and its temperature that raises as required in addition.When the temperature profile on the width of this rough bar after the heating that exit side width thermometer 327 measures is inhomogeneous, measurement data is fed back to the temperature rise controller of lateral type induction heater.This controller control heater is to change temperature rise output, so that the temperature profile of this rough bar on width is even then.
Below, the temperature characteristic of lateral type induction heater is described according to Figure 36.
Figure 36 (a) illustrates the Distribution of temperature rise figure that is heated formed rough bar by the different lateral type induction heater of width with (b).(a) be illustrated in the temperature rise during for parallel posture (solid line) and inclination attitude (dotted line) of its width unshakable in one's determination less than the lateral type induction heater 324 of the width of the rough bar shown in Fig. 9, and the temperature rise of the lateral type induction heater 325 that (b) is illustrated in the width of the rough bar shown in the about Figure 35 of its width unshakable in one's determination when being parallel posture (solid line) and inclination attitude (dotted line).
Shown in Figure 36 (a), when being parallel to rough bar and gap and being 200mm, the less lateral type induction heater 324 of its width unshakable in one's determination can make the temperature at rough bar center raise maximum 40 ℃ corresponding to this iron core width, and can elevate the temperature maximum 53 ℃ when tilting.In addition, outside this iron core width because temperature raises by heat conduction, thus the temperature rise meeting descend gradually, thereby form a level and smooth peak shape temperature rise curve.
In addition, shown in Figure 36 (b), its width unshakable in one's determination is at least the lateral type induction heater 325 of width of rough bar in (be parallel to rough bar and) when being spaced apart 200mm, the bigger characteristic of electric current in view of rough bar two ends, can make the temperature at center of the whole width of rough bar raise 40 ℃, and being the temperature of the part of about 150mm, the width that makes two ends raises about 150 ℃, and when tilting so that the gap, right side becomes 250mm that the gap, left side becomes 150mm, can make the temperature of left part raise maximum 200 ℃, (right part) temperature rising (at most) 120 ℃.
Therefore, as shown in Figure 36 (c),, can make the temperature profile of rough bar on width even by the different lateral type induction heater 324 of these two width and total temperature rise of 325.In addition, by a plurality of lateral type induction heaters being set along roll line and using these heaters together, can fine regulate the Distribution of temperature rise figure of rough bar.
Should point out that the width unshakable in one's determination of the lateral type induction heater that the width that uses among the present invention is the narrowest preferably arrives in the scope of 700mm 400.Its reason is that the typical plate of hot rolled steel plate is wide to be 550 to 800mm, and therefore in order to reduce the edge heating and to add the thermal center (-tre), the width of lateral type induction heater is necessary than this width little 100 to 150mm.
In addition, the width unshakable in one's determination of the lateral type induction heater of big width arrives in the scope of 2000mm 1000.Its reason is that the edge adds heat request width unshakable in one's determination and is equal to or greater than the width of the 1000mm of ordinary hot rolled steel plate to 2000mm.
For example, as shown in Figure 37 (a), the leaning device that is used to tilt the lateral type induction heater among the present invention is the axle 329 that can make lateral type induction heater 320 inclinations of being hung by a supporting member 328, and the hoisting mechanism 330 that is positioned at the end of this lateral type induction heater.When using hoisting mechanism 330 to promote or reducing the end of lateral type induction heater, this lateral type induction heater is tilted by this lateral type induction heater is pivoted around axle 329.In addition, if fix this axle and this heater machinery is pivoted or the armature commentaries on classics,, this heater is tilted even then an end of this heater is kept by this hoisting mechanism.
As another example, shown in Figure 37 (b), can use the two ends of two hoisting mechanisms, 330 supporting lateral type induction heaters 320, and use these hoisting mechanism 330 liftings and reduce this end, thereby this lateral type induction heater is tilted.Should point out that the lateral type induction heater that is arranged on below the steel plate also can tilt by similar means.
In above-mentioned example of the present invention, the example that the lateral type induction heater is tilted has been described, but except tilting, be arranged on lateral type induction heater on the width by lifting, also can obtain same effect.
That is, shown in Figure 38 (a), a plurality of lateral type induction heaters 320 can be set on width, and use hoisting mechanism 333 to promote these heaters individually, thereby add heat and temperature rise on the control width with control gap.
In addition, following method also can obtain same effect: the lateral type induction heater with the iron core that can promote separately is set, this iron core that can promote separately is to obtain by on width the iron core of this heater being divided into a plurality of parts, and make these iron cores on rough bar and below toward each other, and promote and reduce these iron cores.
Promptly, by using a hoisting mechanism 333 to promote and reducing by on width, being divided into the iron core that can promote separately that a plurality of parts obtain with unshakable in one's determination 322, shown in Figure 38 (b), can control gap unshakable in one's determination, thereby add heat and temperature rise on the control width.
Should point out,, can use normally used hoisting mechanism, for example hydraulic pressure, pneumatic or other piston mechanism elevator, crank mechanism elevator, use the elevator of motor etc. for hoisting mechanism 330,331.
In addition, a plurality of lateral type induction heaters are set and change their output, can realize same effect.
That is, shown in Figure 38 (c), a plurality of lateral type induction heaters 320 can be set on width, and use o controller 331 their outputs of control, so as control lateral type induction heater 320 add heat and temperature rise.
Perhaps, shown in Figure 38 (d), can insert and extract out a barricade 32 that is used for changing the magnetic flux between (reducing) lateral type induction heater and the rough bar, with control lateral type induction heater add heat and temperature rise, thereby obtain same effect.Should point out in Figure 38 (d), barricade 332 can insert between upper portion heater and the lower heater and therefrom along vertical (opposite with rolling direction) of rough bar 304 and extract out, with blocking-up and change magnetic flux, but also can insert and extract out barricade 332 along the width of rough bar.
According to hot-rolling method of the present invention, its significant effect is, the Temperature Distribution of rough bar on width attempted to change evenly, this rough bar temperature profile on its width before by finish rolling is inhomogeneous, and can obtain mechanical performance on a kind of width or other material behavior by finish rolling and do not have the hot rolled steel plate that changes.In addition, according to hot-rolling arrangement of the present invention, its significant effect is, can use the left and right sides of the temperature profile of lateral type induction heater on the width of eliminating rough bar before the finish rolling asymmetric, and optionally add the low temperature part at thermal center (-tre) low-temp. portion branch and two ends and the temperature of these parts is raise, thereby can make the temperature profile on the width even.
Example
(example 1)
The inventor uses a roughing mill that one thickness that is heated to 1200 ℃ in heating furnace is 250mm, the width slab as 1250mm, and it is the rough bar of 30mm that roughing becomes thickness.Then, the inventor uses three these rough bars of lateral type induction heater heating shown in Fig. 9 (a), the width of this heater is less than the width of this rough bar, so that the temperature rise maximum of (rough bar) center, and use an edge heater to concentrate its edge of heating.Then, the inventor uses this bar of finishing mill finish rolling, is that 2mm and width are the hot rolled steel plate of 1250mm to generate a thickness.
At this moment, finish rolling speed is 1000mpm.For guaranteeing 860 ℃ target temperature at the finishing mill exit side, the temperature that must make the finishing mill feed side is 1100 ℃.
The temperature profile of finishing mill feed side changes because of the temperature profile on the width and by the temperature drop that heat dissipation caused of roll coil of strip material on vertically.This can compensate by these three lateral type induction heaters and edge heater.The temperature profile of the heating front spring that is obtained by a feed side width thermometer measure is, the temperature of center is 1080 ℃, and the temperature of the peak of mid portion is 1100 ℃, and the temperature of the cold spot of edge is 1040 ℃.Use these three lateral type induction heaters to heat so that up to maximum 20 ℃ of the total rising of the temperature at 1/2 place at center, with reduce because of should in the temperature rise of the mid portion from the center to the edge that is formed centrally, and the temperature difference at the center of elimination.In addition, use edge heater that the temperature Centralized ground at edge is raise 60 ℃.Like this, the difference before rolling in (rough bar) temperature profile on width is reduced to 3 ℃, and the result can obtain the steel plate that material (intensity) on its width and the longitudinal direction only has very little variation.
According to hot-rolling method of the present invention, its significant effect is, before finish rolling, can obtain the even temperature distribution map on the width of rough bar, and can obtain the hot rolled steel plate that mechanical performance on the width and other material behavior not have variation by finish rolling.In addition, according to hot-rolling arrangement of the present invention, can optionally heat the center low temperature part of rough bar and its temperature is raise before finish rolling, therefore significant effect is to obtain the even temperature distribution map on width.
(example 2)
Below, the inventor will describe the present invention in detail according to example.
The inventor has carried out hot rolling test (a) to (e), lateral type bar heater (BH1, BH2 and the BH3) width of heating that uses three width to be 600mm before finish rolling is respectively four types the steel plate (rough bar) through roughing of 900mm, 1200mm, 1500mm and 1800mm in test, on this width, move this bar heater simultaneously, to obtain the even temperature distribution map on the steel plate width direction.Should point out that the inventor changes the distance (gap) between the iron core of upper and lower bar heater in (1) 210mm, (2) 160mm and (3) 130mm Three Estate.In addition, the inventor has found the poor of temperature rise when these grades and temperature rise.In addition, in test (e), the inventor uses the edge heater supplementary heating of width as 900mm.
Table 1 illustrates experimental condition and temperature rise.As shown in table 1, the distance (gap) between the iron core of upper and lower bar heater is narrow more, and then the difference of temperature rise and temperature rise is big more.In addition, the lap of bar heater is big more, and then the difference of temperature rise and temperature rise is big more.Should point out, as shown in figure 14, three bar heaters (BH1 is to BH3) be moved to WS (active side) or DS (driving side).Figure 17 (a) to (e) illustrate with heat run a to the situation of movement of the corresponding bar heater of e on width." temperature rise " that cause by the bar heater in the table 1, as Figure 15 (a), be meant temperature raise before and the minimum temperature on width poor afterwards.In addition, " temperature rise poor " in the table 1 shown in Figure 15 (b), is meant apart from poor with respect to the temperature rise at the center on the width of steel plate of the temperature rise of the position of steel plate edge 150mm.
(table 1)
Displacement (mm) BH lap (mm) Temperature rise (℃) Temperature rise poor (℃)
The a width is 900mm Distance between the BH iron core (mm) (1)210 (2)160 (3)130 ?BH1＝0 ?BH2＝WS150 ?BH3＝DS150 Two of all BH1-BH3:300 BH1 and BH2: two of 150 BH1 and BH3: 150 ?37 ?6
?44 ?7
?48 ?8
EH - ?- ?- ?- ?-
The b width is 1200mm Distance between the BH iron core (mm) (1)210 (2)160 (3)130 ?BH1＝0 ?BH2＝0 ?BH3＝0 Two of all BH1-BH3:600 BH1 and BH2: two of 0 BH1 and BH3: 0 ?41 ?26
?51 ?35
?52 ?40
EH - ?- ?- ?- ?-
The c width is 1500mm Distance between the BH iron core (mm) (1)210 (2)160 (3)130 ?BH1＝0 ?BH2＝WS150 ?BH3＝DS150 Two of all BH1-BH3:300 BH1 and BH2: two of 150 BH1 and BH3: 150 ?34 ?34
?39 ?47
?40 ?54
EH - ?- ?- ?- ?-
The d width is 1800mm Distance between the BH iron core (mm) (1)210 (2)160 (3)130 ?BH1＝0 ?BH2＝WS300 ?BH3＝DS300 Two of all BH1-BH3:0 BH1 and BH2: two of 300 BH1 and BH3: 300 ?31 ?29
?34 ?34
?36 ?37
EH - ?- ?- ?- ?-
The e width is 900mm Distance between the BH iron core (mm) (1)210 (2)160 (3)130 ?BH1＝0 ?BH2＝WS150 ?BH3＝DS150 Two of all BH1-BH3:600 BH1 and BH2: two of 150 BH1 and BH3: 150 ?37 ?6
?44 ?7
?48 ?8
EH - ?- ?- ?30 ?-
Figure 16 illustrates, when using the heating of bar heater and improve four types the temperature of steel plate (distance between the iron core of bar heater=210mm), at the comparative result (to there being the comparison of bar heater heating) of temperature rise that causes by the bar heater before the finish rolling (BH temperature rise) and the temperature profile on the width of finishing mill exit side.As shown in figure 16, the steel plate of process roughing has M shape temperature profile shown in dotted line,, but its temperature raises because of three bar heaters, and total temperature rise of this temperature profile is illustrated by fine line.As a result, shown in heavy line, the temperature profile of steel plate on width becomes even substantially.
Have the steel plate of the temperature profile on this width by finish rolling by this way, can obtain the uniform hot rolled steel plate of material behavior on the width of steel plate.
According to the present invention, can heat any zone on the width of steel plate and improve its temperature, therefore in course of hot rolling, can obtain the even temperature distribution map on the width of steel plate (rough bar), thereby can on the width of hot rolled steel plate, obtain uniform material behavior.In addition, can also make the temperature profile difference on the width of steel plate (rough bar) wittingly, and can obtain the different special steel plate of material behavior on the width by hot rolling.
(example 3)
The thickness that the inventor uses a roughing mill will be heated to 1200 ℃ in heating furnace is 250mm and the width slab as 1250mm, and being rolled into thickness is the rough bar of 30mm.Then, as shown in figure 18, the inventor uses its width to concentrate this rough bar of heating greater than the lateral type induction heater 23 of the width of rough bar 4 at the whole width and the edge of rough bar, use its width to concentrate heating this rough bars (center), and use edge heater 6 to concentrate and heat these edges less than the lateral type induction heater 24 of the width of rough bar 4.Then, the inventor uses this rough bar of finishing mill finish rolling, is that 2mm and width are the hot rolled steel plate of 1250mm to generate a thickness.
At this moment, finish rolling speed is 1000mpm.In order to ensure 860 ℃ target temperature at the finishing mill exit side, the temperature that must make the finishing mill feed side is 1100 ℃.
The temperature profile of finishing mill feed side changes because of the temperature profile on the width and by the temperature drop that heat dissipation caused of roll coil of strip material on vertically.This can compensate by these two heaters and this edge heater.
As shown in figure 20, in the front portion of rough bar, the temperature profile that obtains according to feed side width thermometer is, the temperature of center is 1080 ℃, and the temperature of peak is 1100 ℃, and the temperature of the cold spot of edge is 1040 ℃.The inventor uses the less lateral type induction heater heating of width and the temperature 28 of center is raise maximum 20 ℃, to eliminate the temperature difference at center, uses edge heater simultaneously so that the temperature 29 at edge is concentrated 60 ℃ of risings.Like this, the inventor to make the temperature profile on the width before rolling be uniform.
In addition, as shown in figure 21, at the middle part of rough bar, temperature descends because of heat dissipation comprehensively, and according to feed side width thermometer, the temperature profile before heating is, the temperature of center is 1060 ℃, and the temperature of peak is 1080 ℃, and the temperature of the cold spot of edge is 1000 ℃.The inventor uses the less lateral type induction heater heating of width and the temperature 28 of center is raise maximum 20 ℃, to eliminate the temperature difference at center, use the lateral type induction heater of big width to make 20 ℃ of central temperature risings and the temperature 30 at edge is raise 40 ℃ simultaneously.In addition, the inventor uses edge heater so that the temperature 31 at edge is concentrated 40 ℃ of risings.Like this, the inventor make rolling before temperature profile on width be uniform.
In addition, shown in Figure 22 (a), tail end at rough bar, temperature further descends because of heat dissipation, according to feed side width thermometer, this temperature profile is that the temperature of center is 1040 ℃ before the heating, the temperature of peak is 1060 ℃, and the temperature of the cold spot of edge is 1000 ℃.The inventor uses the less lateral type induction heater heating of width and the temperature 28 of center is raise maximum 20 ℃, to eliminate the temperature difference at center, use the lateral type induction heater of big width to make 40 ℃ of central temperature risings and the temperature 32 at edge is raise 80 ℃ simultaneously.In addition, the inventor uses edge heater so that the temperature 33 at edge is concentrated 20 ℃ of risings.Like this, the inventor can make rolling before temperature profile on width be uniform.
The inventor makes on whole length and whole width that (rough bar) is anterior, middle part and rear portion are 1100 ℃ in the temperature of finishing mill feed side, temperature at the finishing mill exit side is 860 ℃, thereby the material (ductility difference) that obtains on width and the longitudinal direction changes very little steel plate.
That is, if can find the relation of the intensity TS of the temperature difference of finishing mill exit side and finish rolling front spring, shown in Figure 22 (b), then when the temperature difference of finishing mill exit side was 20 ℃, the difference of intensity TS was 10%.Therefore, when adopting the method at conventional heating edge, because the temperature of the center low temperature part of rough bar is than low 20 ℃ of the mean temperature on the width, so the difference of the intensity TS at the width center of the steel plate that obtains (with mean intensity) is 10%, so the material behavior on the width is not uniform.In contrast, in the present invention, because the temperature difference on the width of finishing mill exit side is about 3 ℃, then the difference of the material behavior on the width of resulting steel plate is about 1.5%, so material becomes even.
According to hot-rolling method of the present invention, its significant effect is, the even temperature distribution map on the width of rough bar can be before finish rolling, obtained, and the hot rolled steel plate that mechanical performance on width and other material behavior not have variation can be obtained by finish rolling.In addition, according to hot-rolling arrangement of the present invention, can optionally heat the center low temperature part of rough bar and its temperature is raise before finish rolling, therefore significant effect is to obtain the even temperature distribution map on the width.
(example 4)
The inventor installs one and is used for the lateral type induction heater 204 of the whole width of eddy-current heating one rough bar as shown in figure 23 between a roughing mill 202 and a finishing mill 203, and the front end of this rough bar of eddy-current heating and tail end are with the temperature of this temperature drop part that raises by heating, so that how research reduces the amount of wiping out of this rough bar.The inventor has studied and set gradually this lateral type induction heater 204 and crop(ping)shears 8 between this roughing mill 202 and finishing mill 203, and two kinds of situations that are provided with opposite order.The thickness of rough bar 201 is 30mm.
When the front end 213 of rough bar 201 passes through this induction heater 204, interferric space is made as 340mm, even this makes the rough bar 201 of warpage also can stably pass through.The front end 213 of rough bar add heat and temperature rise 24a shown in the solid line among Fig. 4.When the stable state of rough bar 201 part and tail end 214 passed through this induction heater 204, interferric space narrowed down to 130mm.As a result, the tail end 214 of rough bar adds heat and temperature rise 224b shown in the dotted line among Fig. 4.
For the front end 213 of rough bar and tail end 214 both, datum mark 217 on the longitudinal direction of rough bar is as Figure 27 (a) and the position of the fish tail shape trench 216 (b), and is " with the distance of datum mark " with the distance of this datum mark 217 in the vertical.In Figure 28, abscissa is represented the distance with datum mark, and ordinate is represented the temperature of rough bar 201.(a) state of the front end 213 of rough bar is shown, and the state of the tail end 214 of rough bar (b) is shown.
The clipped position that the inventor determines crop(ping)shears in the mean value X and the standard deviation of the temperature of wiping out the rough bar in position before according to finish rolling.For the front end 213 of rough bar, the inventor is that wipe out 1010 ℃ position at X-2 σ, and at the tail end 214 of rough bar, is that wipe out 924 ℃ position at X-2 σ.The target temperature of front end 213 is higher, and this is because when the low temperature partial rupture of rough bar, situation about going wrong is more serious at the front end of rough bar.
At first, the inventor will illustrate and use the lateral type induction heater to heat rough bar after roughing, and use crop(ping)shears to wipe out the situation of end then.
Figure 28 (a) is near the view of the rough bar temp the front end 213 of rough bar before the finish rolling, and Figure 28 (b) is near the view of the rough bar temp the tail end 214 of rough bar before finish rolling.Stain among the figure represents not carry out the situation of eddy-current heating, and white point represents to exist the situation of eddy-current heating.
The inventor is the front end 213 that this rough bar is sheared in 1010 ℃ position at the X-2 of rough bar temp σ.Shown in Figure 28 (a), the inventor is not carrying out under the situation of eddy-current heating shown in the stain, in the distance with this datum mark 217 is that wipe out the position 219 of wiping out of 171mm, and under the situation that has eddy-current heating shown in the white point, be that the position 218-1 that wipes out of 113mm wipes out in distance with datum mark 217.
The inventor is the tail end 214 that this rough bar is sheared in 924 ℃ position at the X-2 of rough bar temp σ.Shown in Figure 28 (b), the inventor is not carrying out under the situation of eddy-current heating shown in the stain, in the distance with datum mark 217 is that the position 219a that wipes out of 87mm wipes out, under the situation that has eddy-current heating shown in the white point, even at datum mark 217, the X-2 σ of the temperature of rough bar also can be elevated to and surpass 924 ℃ high temperature.As a result, the inventor the distance with datum mark 217 be 12mm wipe out position 218a, that is, wiping out near the position of the datum mark of shape defect (part) almost.
Below, the inventor will illustrate and use crop(ping)shears to shear rough bar after roughing, use the situation of lateral type induction heater heating then.
The inventor is the front end 213 that position 218-2 wipes out rough bar of wiping out of 15mm in the distance with datum mark 217.The same with this first kind of situation then, the inventor expresses under the situation that has eddy-current heating the temperature of rough bar before finish rolling with the white square among Figure 28 (a).When carrying out eddy-current heating, the inventor has finished and has wiped out, thereby can be that the position 218-2 that wipes out of 15mm obtains enough temperature rises (250 ℃) in the distance with datum mark 217.As a result, (with the distance of datum mark 217 for) 15mm wipe out position 218-2, the X-2 σ of the temperature of rough bar becomes 1010 ℃.Therefore, the inventor can wipe out in a position near the datum mark of shape defect.
Should point out, under first kind of situation of after eddy-current heating, wiping out, obtain enough temperature rises at tail end 214 places of rough bar.Even after wiping out, carry out must obtaining enough temperature rises under the situation of eddy-current heating, and can with first kind of mode that situation is identical, wipe out at a position 218a that wipes out apart from this datum mark 12mm.
The present invention installs a lateral type induction heater that is used for the whole width of eddy-current heating one rough bar between a roughing mill and a finishing mill, with this rough bar of heating, thereby can make fully raising with the temperature of the temperature drop of caudal end part foremost of this rough bar, and need the time not stop the motion of this rough bar in heating, and do not need the great amount of investment cost, and can reduce the amount of wiping out of rough bar.

Claims (24)

1. the hot-rolling method of a steel plate, the hot-rolling method of described steel plate is characterised in that, the heating rolling material, change the temperature rise on the width of this rolling stock simultaneously, so that the temperature on the width of this rolling stock of the feed side of a finishing mill or exit side becomes a predetermined temperature profile.
2. method that heats steel plate, it is characterized in that, a plurality of bar heaters on the longitudinal direction that is arranged on steel plate are moved on the width of steel plate, operate this bar heater heating, and be controlled at the temperature profile on the width of steel plate.
3. method that heats steel plate, it is characterized in that, the a plurality of bar heaters that are arranged on the steel plate longitudinal direction are moved on the width of steel plate, so that have lap on the longitudinal direction of steel plate, and the amount of controlling this lap is with the temperature profile on the width of control steel plate.
4. method according to the heating steel plate of claim 2 or 3, it is characterized in that, after the center on the width that will these a plurality of bar heaters moves to this steel plate, heat center on the width of concentrating this steel plate of heating by operating these a plurality of bar heaters.
5. method according to the heating steel plate of claim 2 or 3, it is characterized in that, after will these a plurality of bar heaters moving to position, by operating all parts on the width that these a plurality of bar heaters heat this steel plate with constant interval.
6. method according to the heating steel plate of any one in the claim 2 to 5, it is characterized in that, use a temperature profile that is arranged on the width of this steel plate of width thermometer measure of upstream side of this bar heater, and determine the displacement of this bar heater according to the described temperature profile that measures.
7. the method according to the heating steel plate of any one in the claim 2 to 6 is characterized in that, can carry out moving in the roll coil of strip material.
8. the hot-rolling arrangement of a steel plate, the hot-rolling arrangement of described steel plate is characterised in that, between the roughing mill on the roll line, between roughing mill and the finishing mill or a heater is set between the finishing mill, change the temperature rise on the width of the rolling stock of roughing mill feed side simultaneously to heat.
9. the hot-rolling arrangement of a steel plate according to Claim 8, it is characterized in that this heater is that the temperature rise of the center on a kind of width that makes this rolling stock at least becomes greater than the heater of the temperature rise of the mid portion between two edges on described center and this width.
One kind according to Claim 8 or the hot-rolling arrangement of 9 steel plate, it is characterized in that this heater is that the temperature rise of two edges on a kind of width that makes this roughing mill becomes greater than the heater of the temperature rise of the mid portion on this width.
11. hot-rolling arrangement of the steel plate of any one in 10 according to Claim 8, the hot-rolling arrangement of described steel plate is characterised in that, this hot-rolling arrangement has a heater that only is used to heat the temperature rise on the width that changes this rolling stock one through the center low temperature part of the rough bar of roughing, simultaneously, and an edge heater that is used to heat two edge low temperature parts of this rough bar.
12. hot-rolling arrangement of the steel plate of any one in 11 according to Claim 8, it is characterized in that, this hot-rolling arrangement have one be arranged on a finishing mill feed side be used for the heating, change the heater of the temperature rise on the width of this rolling stock on the width of this rolling bar simultaneously, one is used to heat the edge heater of two edge low temperature parts on the width of this rough bar, with a temperature monitoring that is used to monitor the temperature profile on the width of this rough bar, the maximum of the temperature on the width that will be monitored by described temperature monitoring is as the reference temperature, seek the temperature of the difference on this width and the temperature difference between this reference temperature, and determine the temperature rise that this difference is required, thereby make the temperature of this width become a predetermined temperature profile according to the described temperature difference.
13. the hot-rolling arrangement of the steel plate of any one in 12 according to Claim 8 is characterized in that, is provided with at least two heaters along this roll line.
14. the hot-rolling arrangement of the steel plate of any one in 13 according to Claim 8 is characterized in that, described heater is one can heat and change simultaneously the lateral type induction heater of the temperature rise on the width of this rolling stock.
15. the hot-rolling arrangement according to the steel plate of claim 14 is characterized in that, described lateral type induction heater is at least two lateral type induction heaters that the width unshakable in one's determination on this width is different.
16. a material behavior that is used on width does not have the hot-rolling arrangement of the steel plate of variation, this hot-rolling arrangement has a bar plate heating stove, one roughing mill and a finishing mill, the hot-rolling arrangement of described steel plate is characterised in that, have the lateral type induction heater at the center that can only heat steel plate and can heat this steel plate whole width and can make the lateral type induction heater of the temperature rise of edge greater than the temperature rise of center.
17. hot-rolling arrangement that material behavior on the width does not have the steel plate that changes that is used for according to claim 16, it is characterized in that, at least one can only heat the width unshakable in one's determination of lateral type induction heater at center of this steel plate 400 in the scope of 700mm, and at least one temperature rise that can heat the whole width of this steel plate and can make edge greater than the width unshakable in one's determination of the lateral type induction heater of the temperature rise at this center 800 in the scope of 2500mm.
18. one group of equipment of hot rolling, it is characterized in that, on the longitudinal direction between a roughing mill and the finishing mill, set gradually a lateral type induction heater and that is used for the whole width of eddy-current heating one rough bar and can wipe out the front end of this rough bar and the cutter of tail end.
19. one group of equipment of hot rolling, it is characterized in that, on the longitudinal direction between a roughing mill and the finishing mill, set gradually the lateral type induction heater that the cutter and that can wipe out the front end of a rough bar and tail end is used for the whole width of this rough bar of eddy-current heating.
20. hot-rolling method, it is characterized in that, use one group of equipment of hot rolling, and use one of the front end of this rough bar of described lateral type induction heater heating distance and tail end or both ends to be no more than at least one part of 1m according to claim 18 or 19.
21. the hot-rolling method according to claim 20 is characterized in that, by the heating temperature of one of the front end of this rough bar and tail end or both temperature drops part that raises, thereby reduces the amount of wiping out of this rough bar.
22. the hot-rolling arrangement of a steel plate, this hot-rolling arrangement has a heating furnace that is used to heat slab, one roughing mill and that is used for this slab of roughing is used for the finishing mill of the rough bar of this process roughing of finish rolling, the hot-rolling arrangement of described steel plate is characterised in that, between this roughing mill and this finishing mill, be provided with the big and lateral type induction heater vertically respect to one another of the temperature rise that to heat the center that makes this steel plate, and have a leaning device that is used to make the top of described lateral type induction heater or bottom or both to tilt along the width of this roll line.
23. the hot-rolling arrangement of a steel plate, this hot-rolling arrangement has a heating furnace that is used to heat slab, one roughing mill and that is used for this slab of roughing is used for the finishing mill of the rough bar of this process roughing of finish rolling, the hot-rolling arrangement of described steel plate is characterised in that, width along this roll line is provided with a plurality of lateral type induction heaters vertically respect to one another between this roughing mill and this finishing mill, and has the output controller that can regulate the output of this lateral type induction heater.
24. the hot-rolling arrangement of a steel plate, this hot-rolling arrangement has a heating furnace that is used to heat slab, one roughing mill and that is used for this slab of roughing is used for the finishing mill of the rough bar of this process roughing of finish rolling, the hot-rolling arrangement of described steel plate is characterised in that, between this roughing mill and this finishing mill, be provided with lateral type induction heater vertically respect to one another, and have one and be used to change the barricade extracted of described lateral type induction heater with respect to the magnetic flux of the width of this roll line.
CNB038187701A 2002-06-07 2003-06-06 Hot rolling method and apparatus for hot steel sheet Expired - Lifetime CN100333846C (en)

Applications Claiming Priority (13)

Application Number Priority Date Filing Date Title
JP167512/2002 2002-06-07
JP2002167512 2002-06-07
JP193300/2002 2002-07-02
JP2002193300A JP4133042B2 (en) 2002-07-02 2002-07-02 Steel sheet hot rolling method and apparatus
JP206831/2002 2002-07-16
JP2002206831A JP2004050183A (en) 2002-07-16 2002-07-16 Method and device for hot-rolling steel sheet
JP365867/2002 2002-12-17
JP2002365867A JP3793503B2 (en) 2002-12-17 2002-12-17 Steel plate heating method
JP034808/2003 2003-02-13
JP2003034808A JP3793512B2 (en) 2003-02-13 2003-02-13 Hot rolling equipment arrangement and hot rolling method
JP2003070030A JP3793515B2 (en) 2002-06-07 2003-03-14 Steel sheet hot rolling method and apparatus
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PCT/JP2003/007229 WO2004000476A1 (en) 2002-06-07 2003-06-06 Hot rolling method and apparatus for hot steel sheet

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CN109794506A (en) * 2019-04-04 2019-05-24 哈尔滨工业大学（威海） A kind of hot forming steel plate rolling formation device and method
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