WO2010061946A1 - Dispositif de refroidissement dans une ligne de laminage à chaud de profilés en t, installation de fabrication et procédé de fabrication de profilés en t - Google Patents

Dispositif de refroidissement dans une ligne de laminage à chaud de profilés en t, installation de fabrication et procédé de fabrication de profilés en t Download PDF

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Publication number
WO2010061946A1
WO2010061946A1 PCT/JP2009/070085 JP2009070085W WO2010061946A1 WO 2010061946 A1 WO2010061946 A1 WO 2010061946A1 JP 2009070085 W JP2009070085 W JP 2009070085W WO 2010061946 A1 WO2010061946 A1 WO 2010061946A1
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WIPO (PCT)
Prior art keywords
flange
web
rolled
rolling mill
cooling
Prior art date
Application number
PCT/JP2009/070085
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English (en)
Japanese (ja)
Inventor
高嶋由紀雄
高橋英樹
山口陽一郎
中田直樹
Original Assignee
Ｊｆｅスチール株式会社
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Priority to CN200980136813.0A priority Critical patent/CN102159335B/zh
Publication of WO2010061946A1 publication Critical patent/WO2010061946A1/fr

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    • 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
    • B21B45/02—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 for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • 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
    • B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/092—T-sections
    • 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
    • B21B45/02—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 for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • 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
    • B21B45/02—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 for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B2045/0221—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for structural sections, e.g. H-beams

Definitions

  • the present invention relates to a cooling device, a manufacturing facility, and a manufacturing method when manufacturing a T-shaped steel (T-bar) by hot rolling.
  • Fig. 11 shows the cross-sectional shape of the T-section steel.
  • the T-section steel 20 is a section steel having a T-shaped cross section composed of a web 21 and a flange 22 and is widely used in fields such as shipbuilding and bridges.
  • T-shaped steel products are manufactured in various dimensions depending on the application, usage conditions, location, etc. Commonly used dimensions of the T-shaped steel 20 are: web height: about 200 to 1000 mm, web thickness: about 8 to 25 mm, internal web dimension: about 190 to 980 mm, flange width: about 80 to 400 mm, flange thickness: 12 It is about ⁇ 40mm.
  • the web height is often more than twice the flange width.
  • the T-section steel 20 is generally manufactured by welding the web 21 and the flange 22, but a technique of integrally forming by hot rolling has also been proposed.
  • FIG. 12 shows an example of hot rolling equipment.
  • the hot rolling equipment 101 includes a rough shaping rolling mill 102 that reciprocally rolls a raw steel piece carried out of a heating furnace (not shown) to roughly form a cross-section with a substantially T-shaped section, and the rough shaping rolling mill 102 substantially Intermediate rolling mill group 103 for forming a T-shaped steel piece roughly formed into a T shape (see FIG. 14) into a T-shaped steel having a substantially product size, and a T-shaped steel formed into a substantially product size as a product size.
  • a finishing universal rolling mill 106 for forming is provided.
  • the intermediate rolling mill group 103 includes a rough universal rolling mill 104 and an edger rolling mill (edger mill) 105 installed downstream of the rough universal rolling mill 104.
  • the rolling process by the rough shaping rolling mill 102 is a rough shaping rolling process, and the configuration of the rough shaping rolling mill 102 is schematically shown in FIG.
  • the rough shaping rolling mill 102 includes an upper roll 102a and a lower roll 102b in which three sets of perforations are formed. Then, the rough shaping rolling mill 102 sequentially rolls the material steel slabs with these hole molds to obtain a material to be rolled (T-shaped steel slab) H composed of the web 21 and the flange 22 shown in FIG. .
  • FIG. 13B shows the configuration of the rough universal rolling mill 104
  • FIG. 1 schematically shows the configuration of the edger mill 105.
  • the rough universal rolling mill 104 includes a pair of horizontal rolls 141a and 141b and a pair of vertical rolls 142a and 142b as shown in FIG.
  • the edger rolling mill 105 has a pair of edger rolls 151a and 151b each having a large diameter roll part 153 and a small diameter roll part 154, as shown in FIG.
  • the material to be rolled (T-shaped slab) H obtained in the rough shaping rolling process is a rough universal rolling mill 104 and an edger rolling mill 105 that constitute an intermediate rolling mill group 103 installed on the downstream side of the rough shaping rolling mill 102.
  • the thickness of the web 21 and the flange 22 is reduced, and the material to be rolled (T-shaped steel having a substantially product size) H in which the flange width of the flange 22 is adjusted.
  • various roll thicknesses can be adjusted without changing the roll by adjusting the roll opening of the horizontal rolls 141a and 141b, and various by adjusting the roll opening of the reed roll 142a.
  • the flange thickness can be adjusted.
  • the flange width can be adjusted by adjusting the distance between the small diameter portions 154 of the pair of edger rolls 151a and 151b.
  • the rolling process by the finishing universal rolling mill 106 is a finishing rolling process, and the configuration of the finishing universal rolling mill is schematically shown in FIG.
  • the finishing universal rolling mill 106 includes a pair of horizontal rolls 161a and 161b and a pair of trough rolls 162a and 162b as shown in FIG. 13 (D).
  • the to-be-rolled material H obtained by the intermediate rolling process becomes the product cross-sectional shape by the flange 22 standing upright by the finishing universal rolling mill 106.
  • Patent Document 2 discloses that the outer surface of the flange of the T-shaped steel or the inner surface of the flange is conveyed while conveying the T-shaped steel that has been hot-rolled in the longitudinal direction with the web oriented in a substantially horizontal direction. A technique for water-cooling the web side and the outer surface is disclosed.
  • Patent Document 2 describes that the flange of the T-shaped steel that has been hot-rolled is cooled (water cooled) by water cooling.
  • the method described in 1) was found to have the following problems.
  • the T-shaped steel flange contracts by water cooling, so that the T-shaped steel during cooling and immediately after cooling is bent to the flange side (the flange side is A concave bend) occurs.
  • the temperature difference between the flange and the web is about 100 ° C. or more at the end of hot rolling, and it is powerful to prevent bending of the product by cooling the flange so as to eliminate the temperature difference after hot rolling. Cooling needs to be performed, and as a result, there is a possibility that the bending to the flange side becomes excessive and the T-shaped steel jumps out of the rolling line.
  • Patent Document 2 it is necessary to transport the T-shaped web in the longitudinal direction in a posture in which the T-shaped steel is oriented substantially in the horizontal direction. In order to cool while maintaining, it is necessary to provide a mechanism for supporting the tip of the web. In order to perform sufficient cooling, it is necessary to lengthen the cooling equipment, and the cost of the web support mechanism increases as the cooling equipment becomes longer.
  • the techniques described in Patent Documents 1 and 2 have the following problems. That is, the material of the T-shaped steel produced by hot rolling is not only a general mild steel, but a high-strength steel having a yield stress of 325 MPa or more, for example, a so-called high-tensile material for a ship-shaped T-shaped steel used for shipbuilding. (High tense strength steel) is required.
  • controlled rolling is performed in which the temperature of the material to be rolled is rolled in a non-recrystallization region or a two-phase region (austenite and ferrite two-phase region).
  • the present invention has been made to solve the above-described problems, and its object is to provide a T-shaped steel by hot rolling that can minimize the cooling bend caused by the temperature difference between the flange and the web. It is providing the manufacturing equipment and manufacturing method of this.
  • An outer surface water-cooling nozzle that cools the outer surface of the rolled material consisting of a web having a substantially T-shaped cross section and a flange by water cooling, and the inner surface of the flange of the rolled material are cooled by water cooling. At least one of an inner surface water-cooling nozzle and at least one of the outer surface water-cooling nozzle and the inner surface water-cooling nozzle with respect to an upper surface of a roller table on which the web of the material to be rolled conveys the material to be rolled.
  • a cooling device for a T-shaped steel hot rolling line which is provided at a possible position and orientation.
  • an inner surface water cooling nozzle for cooling the flange inner surface of the material to be rolled cools the upper flange inner surface above the web.
  • the lower flange inner surface water-cooled nozzle is set to an angle ⁇ that is upward with respect to the upper surface of the roller table, and the lower flange inner surface water-cooled nozzle has an injection angle ⁇ higher than the jet angle ⁇ of the upper flange inner surface water-cooled nozzle.
  • a cooling device for a T-section hot rolling line characterized in that the injection angle ⁇ is set large ( ⁇ ⁇ ).
  • a group of intermediate rolling mills for rolling the material to be rolled comprising a web and flange having a substantially T-shaped cross section roughly rolled by a machine into a material to be rolled comprising a web and flange having a substantially product size;
  • a T-section steel manufacturing facility, wherein the cooling device for the T-section hot rolling line according to (1) or (2) above is installed on at least one of the front and rear surfaces of the intermediate rolling mill group.
  • the cooling device is disposed outside a rolling mill main body of the intermediate rolling mill group.
  • the rolling mill main body is provided with the main body of the foremost rolling mill of the intermediate rolling mill group and the cooling apparatus on the rear surface of the intermediate rolling mill group.
  • the outside of the rolling mill body means the outside of a housing that contains a roll chock or the like that supports the rolling roll of the rolling mill, or guides that are extended into the housing.
  • cooling of the T-section hot rolling line according to (1) or (2) above the finish rolling mill A T-section steel manufacturing facility characterized by the installation of equipment.
  • the cooling device is disposed outside a rolling mill body of the finishing mill.
  • the outside of the rolling mill body means the outside of a housing that contains a roll chock or the like that supports a rolling roll of the rolling mill, or guides that are extended into the housing.
  • the intermediate rolling mill group has a cross-sectional shape in which a width of a roll outer peripheral surface is roughly rolled by the rough shaping rolling mill.
  • the first rough universal rolling mill having upper and lower horizontal rolls wider than the inner dimension of the rolled material (inner height of web) consisting of a T-shaped web and a flange, and the flange end face of the rolled material being rolled down
  • the edger rolling machine the upper and lower horizontal rolls whose width of the outer peripheral surface of the roll is equal to or less than the in-web dimension of the material to be rolled, and one of which presses down the flange in the thickness direction and the other is the web end face
  • a second rough universal rolling mill having left and right side rolls that are rolled down in the direction.
  • a rough shaping rolling process in which a raw steel slab conveyed from a heating furnace is roughly rolled by a rough shaping rolling mill into a material to be rolled consisting of a web having a substantially T-shaped cross section and a flange, and is roughly rolled by the rough shaping rolling process.
  • An intermediate rolling step of rolling the material to be rolled comprising a web and a flange having a substantially T-shaped cross section into a material to be rolled comprising a web and a flange having a substantially product size by a group of intermediate rolling mills
  • the intermediate rolling step at least one of the front and rear surfaces of the intermediate rolling mill group, the web of the material to be rolled is substantially water with respect to the upper surface of the roller table that conveys the material to be rolled.
  • a method for producing a T-shaped steel characterized in that:
  • the cooling device of the T-section hot rolling line according to the above (1) of the present invention is an outer surface water-cooling nozzle that water-cools the flange outer surface of the T-shaped steel that is a material to be rolled and / or an inner surface water-cooled nozzle that water-cools the flange inner surface.
  • the outer surface water-cooling nozzle and / or the inner surface water-cooling nozzle is configured so that the web tip and the lower end of the flange are at the same height from a substantially horizontal state with respect to the upper surface of the roller table on which the web of the material to be rolled conveys the material to be rolled.
  • the web When the web is tilted up to this state, the web is provided at a position and orientation in which water can be poured toward the outer surface and the inner surface of the flange in any tilted state of the web. For this reason, even when a plurality of outer surface water cooling nozzles and inner surface water cooling nozzles are arranged in the rolling direction (conveyance direction) of the material to be rolled to form a cooling device, the height of the nozzles is not affected by the difference in the inclined state of the web at each nozzle installation position. Since the vertical position and the cooling water injection angle are the same, the equipment structure can be simplified and the equipment cost can be reduced. Further, since it is not necessary to transport the web of the material to be rolled in the longitudinal direction in a posture oriented in a substantially horizontal direction, a mechanism for supporting the web tip of the material to be rolled becomes unnecessary, and the equipment cost can be reduced.
  • the cooling apparatus of the T-shaped steel hot rolling line according to the above (2) of the present invention is an inner surface water-cooling nozzle for water-cooling the inner surface of the flange of the T-shaped steel that is the material to be rolled, and the inner surface of the upper flange above the web.
  • the upper flange inner surface water cooling nozzle for cooling the lower flange inner surface water cooling nozzle for cooling the lower flange inner surface below the web, and the jet angle of the upper flange inner surface water cooling nozzle is downward with respect to the upper surface of the roller table.
  • the injection angle of the lower flange inner surface water-cooled nozzle is set to an angle ⁇ that is upward with respect to the upper surface of the roller table, and the lower flange inner surface water-cooled nozzle injection angle ⁇ is greater than the upper flange inner surface water-cooled nozzle injection angle ⁇ . Since it is set large ( ⁇ ⁇ ), the cooling water sprayed on the inner surfaces of the upper and lower flanges will collide at a more nearly perpendicular angle in any inclined state of the web. Ability can be improved. Also, the difference in cooling state between the upper and lower flanges is reduced, and the temperature difference between the upper and lower flanges can be reduced.
  • the flange of the material to be rolled on the front surface and / or the rear surface of the intermediate rolling mill group Since the material is cooled by water cooling during rolling, the amount of bending generated in the material to be rolled by one water cooling can be reduced by rolling the material to be rolled during water cooling. In addition, it is possible to straighten the bending generated by water cooling for each flange by plastic processing in the next rolling, and even if the flange is water cooled so as to reduce the temperature difference between the flange and the web, the rolled material flange The bending to the side can be reduced. For this reason, the bending produced during the rolling by the flange water cooling is small, and the T-section steel can be rolled without causing problems such as jumping of the material to be rolled out of the line due to the bending.
  • the cooling device is arranged outside the rolling mill main body of the intermediate rolling mill group, there is no space and the cooling device is installed. Compared with the case where the cooling device is arranged in the rolling mill main body of the difficult intermediate rolling mill group, a large cooling capacity can be obtained with a small equipment cost. Also, since the web is generally inclined outside the rolling mill main body, the cooling water sprayed toward the inner surface of the upper flange is drained without staying on the upper surface of the web, and uneven cooling is performed on the upper and lower surfaces of the web. Can be suppressed.
  • the flange of a to-be-rolled material is water-cooled by the front surface of a finishing mill. Since cooling is performed, the cooling bend caused by the temperature difference between the flange and the web can be further reduced.
  • the manufacturing apparatus of the T-section steel according to the above (6) of the present invention since the cooling device is disposed outside the rolling mill main body of the finish rolling mill, there is no space and it is difficult to install the cooling device. Compared with the case where the cooling device is arranged on the rolling mill main body of a finishing mill, a large cooling capacity can be obtained with a small equipment cost.
  • the cooling water sprayed toward the inner surface of the upper flange is drained without staying on the upper surface of the web, and uneven cooling is performed on the upper and lower surfaces of the web. Can be suppressed.
  • the intermediate rolling mill group has a substantially T-shaped cross section in which the width of the outer peripheral surface of the roll is roughly rolled by the rough shaping rolling mill.
  • a first rough universal rolling mill having upper and lower horizontal rolls wider than the in-web dimension of the rolled material comprising a web and a flange, an edger rolling mill for rolling down the end surface of the flange of the rolled material, and an outer peripheral surface of the roll.
  • the upper and lower horizontal rolls whose width is equal to or less than the in-web dimension of the material to be rolled, and the left and right horizontal rolls that press down the flange in the plate thickness direction and the other presses down the end face of the web in the web height direction.
  • a second rough universal rolling mill Therefore, it is possible to obtain a web having a web height that satisfies the target value while maintaining the hot rolling, and it is not necessary to cut the web tip after the hot rolling. Since the cutting process becomes unnecessary, the manufacturing process can be shortened and the manufacturing cost can be reduced. Furthermore, by changing the balance between the web and flange reduction ratio in the first and second rough universal rolling mills, the bending of the exit side of the material to be rolled can be controlled by rolling, so water-cooled bending control is easy. Can be.
  • FIG. 1 is a schematic configuration diagram of an embodiment of a T-section steel manufacturing facility according to the present invention.
  • FIG. 2 is a view showing a state in which the cooling device according to the present invention is arranged outside the rolling mill main body of the first rough universal rolling mill constituting the intermediate rolling mill group.
  • FIG. 3 (a) is a schematic diagram for explaining the configuration of the cooling device of the present invention and the cooling state by the cooling device when the material to be rolled is in the vicinity of the rolling roll.
  • FIG. 3 (b) and FIG. c) is a schematic diagram for explaining a cooling state by the cooling device until the material to be rolled is separated from the rolling roll and the web is inclined and is placed on the roller table.
  • FIG. 1 is a schematic configuration diagram of an embodiment of a T-section steel manufacturing facility according to the present invention.
  • FIG. 2 is a view showing a state in which the cooling device according to the present invention is arranged outside the rolling mill main body of the first rough universal rolling mill constituting the intermediate rolling mill group.
  • FIG. 4 is a schematic diagram for explaining another configuration of the cooling device of the present invention.
  • FIG. 5 is a schematic view for explaining still another configuration of the cooling device of the present invention.
  • FIG. 6 is a schematic diagram for explaining a first rough universal rolling mill used in the T-section steel manufacturing facility shown in FIG. 1.
  • FIG. 7 is a schematic diagram for explaining an edger rolling machine used in the T-shaped steel manufacturing facility shown in FIG.
  • FIG. 8 is a schematic diagram for explaining a second rough universal rolling mill used in the T-shaped steel manufacturing facility shown in FIG. 1.
  • FIG. 9 is a schematic diagram for explaining a modification of the second rough universal rolling mill used in the T-section steel manufacturing facility shown in FIG.
  • FIG. 10 is a schematic diagram for explaining a finishing mill used in the T-section steel manufacturing facility shown in FIG.
  • FIG. 11 is a cross-sectional view of a T-section steel.
  • FIG. 12 is a schematic configuration diagram showing a conventional T-shaped steel manufacturing facility.
  • FIG. 13A is a schematic diagram for explaining a rough shaping rolling machine used in a conventional T-shaped steel manufacturing facility
  • FIG. 13B is a rough universal used in a conventional T-shaped steel manufacturing facility.
  • a schematic diagram for explaining a rolling mill
  • FIG. 13C is a schematic diagram for explaining an edger rolling mill used in a conventional T-shaped steel manufacturing facility
  • FIG. 13D is a conventional T-shape. It is a schematic diagram for demonstrating the finishing universal rolling mill used for the steel manufacturing equipment.
  • FIG. 14 is a cross-sectional view of a T-shaped steel piece having a substantially T-shaped cross section.
  • FIG. 15 is a partial perspective view for explaining a bending state toward the flange side during the cooling of the T-shaped steel.
  • FIG. 1 is a schematic configuration diagram of an embodiment of a production facility for T-section steel according to the present invention.
  • the T-shaped steel manufacturing facility 1 shown in FIG. 1 sequentially includes a rough shaping rolling mill 2, an intermediate rolling mill group 3, and a finishing rolling mill 7 from the upstream side to the downstream side, that is, from the front side to the rear side. It is arranged.
  • the rough shaping rolling mill 2 reciprocally rolls a material to be rolled (raw steel slab, not shown) conveyed on a roller table (not shown) from a heating furnace (not shown), and has a substantially T-shaped cross section. And a material to be rolled (T-shaped steel slab, see FIG. 14) H which is roughly rolled (rough modeling rolling process).
  • known equipment can be used, for example, a double rolling mill equipped with a roll having a hole shape.
  • the intermediate rolling mill group 3 is installed in the subsequent stage of the rough shaping rolling mill 2, and the material to be rolled H composed of the web 21 and the flange 22 having a substantially T-shaped cross section that is roughly rolled by the rough shaping rolling mill 2.
  • the intermediate rolling mill group 3 includes a first rough universal rolling mill 4 shown in FIG. 6 and an edger rolling mill shown in FIG. 7 installed at a stage subsequent to the first rough universal rolling mill 4. 5 and the second rough universal rolling mill 6 shown in FIG. 8 installed at the subsequent stage of the edger rolling mill 5.
  • the intermediate rolling mill group 3 is composed of two rough universal rolling mills and one edger rolling mill, but this is an example, and the number of rolling mills in the intermediate rolling mill group 3 is the same. There is no restriction, and for example, it may be composed of one rough universal rolling mill and one edger rolling mill. Further, the configuration may be such that there are three or more rough universal rolling mills and two or more edger rolling mills.
  • the first rough universal rolling mill 4 includes a pair of upper and lower horizontal rolls 41a and 41b that rotate about a horizontal axis, and a pair of left and right ridge rolls 42a that rotate about a vertical axis. , 42b.
  • the pair of upper and lower horizontal rolls 41a and 41b and the pair of left and right heel rolls 42a and 42b are arranged to face each other.
  • the width W1 of the outer peripheral surfaces of the horizontal rolls 41a and 41b is set to be larger than the internal dimension L (the distance from the flange inner surface to the web tip) of the web 21 of the material H to be rolled.
  • the width W1 of the outer peripheral surface of the horizontal rolls 41a and 41b is preferably 105 to 150% of the internal dimension L of the web 21.
  • the entire surface in the height direction of the web 21 is crushed in the plate thickness direction by the horizontal rolls 41a and 41b, and the flange 22 is formed on the side surface of the roll roll 42a and the horizontal rolls 41a and 41b. Roll down in the direction.
  • the thickness of the web 21 is adjusted by adjusting the opening of the horizontal rolls 41a and 41b
  • the thickness of the flange 22 is adjusted by adjusting the opening of the flange roll 42a and the side surfaces of the horizontal rolls 41a and 41b.
  • the edger rolling mill 5 includes edger rolls 51 a and 51 b including a large diameter roll portion 53 and a small diameter roll portion 52 in the horizontal axis direction, and the large diameter roll portion 53 is the material to be rolled H.
  • the web 21 is guided, and the roll surface 52a of the small-diameter roll portion 52 reduces the end face of the flange 22 in the width direction.
  • the roll diameter of the large-diameter roll portion 53 and the roll diameter of the small-diameter roll portion 52 are such that the roll surface of the large-diameter roll portion 53 is the upper and lower surfaces in the thickness direction of the web 21 during rolling of the end face of the flange 22 by the small-diameter roll portion 52.
  • the gap is preferably 2 mm or less.
  • the second rough universal rolling mill 6 includes a pair of upper and lower horizontal rolls 61a and 61b that rotate about a horizontal axis, and a pair of left and right ridge rolls 62a that rotate about a vertical axis. 62b.
  • the pair of upper and lower horizontal rolls 61a and 61b and the pair of left and right heel rolls 62a and 62b are opposed to each other.
  • the width W2 of the roll outer peripheral surfaces of the horizontal rolls 61a and 61b is set to be equal to or less than the internal dimension L (the distance from the flange inner surface to the web tip) of the web 21 of the material H to be rolled.
  • the width W2 of the outer peripheral surfaces of the horizontal rolls 61a and 61b is preferably about 70 to 100% of the internal dimension L of the web 21. Furthermore, it is preferable to secure a difference of 30 mm or more between W1 and W2.
  • the width W2 of the roll outer peripheral surface of the horizontal rolls 61a and 61b of the second rough universal rolling mill 6 when making the width W2 of the roll outer peripheral surface of the horizontal rolls 61a and 61b of the second rough universal rolling mill 6 the same as the internal dimension L of the web 21 of the material H to be rolled, as shown in FIG. It is preferable to use a material obtained by processing the corner portion c on the tip end side of the web 21 into a shape that does not roll the web surface. Since the width W2 of the roll outer peripheral surface of the horizontal rolls 61a and 61b is the same dimension as the internal dimension L of the web 21, the tip of the web 21 can be crushed by the heel roll 62b and the web surface is not rolled.
  • corner portion c Since a space is created between the vicinity of the front end portion of the web 21 and the horizontal rolls 61a and 61b by the corner portion c processed into a shape, it is possible to absorb an increase in web thickness due to the reduction of the front end portion of the web 21. .
  • processing of the corner portion c for example, arc processing, chamfering processing, step processing or the like may be performed.
  • the roll opening degree of the horizontal rolls 61a and 61b is adjusted, the plate
  • the height of the web 21 and the shape of the end portion are adjusted by adjusting the opening of the flange 22b and the other side of the horizontal rolls 61a and 61b.
  • the finishing mill 7 is installed behind the intermediate rolling mill group 3, and the rolled material H rolled to a substantially product size by the intermediate rolling mill group 3 is a T-shaped steel made up of a web 21 and a flange 22 of product dimensions. 20 is finish-rolled (finish rolling step).
  • the finish rolling mill 7 is composed of a finish universal rolling mill. As shown in FIG. 10, a pair of upper and lower horizontal rolls 71a and 71b rotating around a horizontal axis and a pair of left and right rotating around a vertical axis. It includes scissors rolls 72a and 72b. The side surfaces of the horizontal rolls 71a and 71b are orthogonal to the roll surface.
  • the flange 22 of the material H to be rolled is lightly rolled with the roll 72a, the flange 22 is formed perpendicular to the web 21.
  • the horizontal rolls 71a and 71b can be prevented from moving in the axial direction by pressing the scissors roll 72b against the side surfaces of the horizontal rolls 71a and 71b on the side not facing the flange 22.
  • the web 21 is hardly crushed or lightly crushed so as to adjust the shape and dimensions.
  • the width of the pressed surface of the horizontal rolls 71a and 71b is made larger than the in-web dimension. Preferably, it is about 105 to 150% of the internal dimension L of the web 21.
  • the finishing universal rolling mill and the rough universal rolling mill are generally different in the shape of the flange roll on the flange 22 side. That is, in the rough universal rolling mill, as shown in FIG. 8, the peripheral surface of the scissors roll 62 a has a mountain shape in accordance with the inclination of the flange, but in the finishing universal rolling mill, as shown in FIG. 10.
  • the peripheral surface of the heel roll 72a has a linear shape.
  • Cooling devices 8 and 9 are installed on the front surface of the first rough universal rolling mill 4 and the rear surface of the second rough universal rolling mill 6.
  • FIG. 2 shows the cooling device 8 installed on the front surface of the first rough universal rolling mill 4.
  • the first rough universal rolling mill 4 includes a housing 11 containing a roll chock or the like that supports a pair of upper and lower horizontal rolls 41a and 41b and a pair of left and right side rolls 42a and 42b (not shown), horizontal rolls 41a and 41b, Web guides 12a to 12d fixed to the housing 11 so as to guide the material to be rolled H to the center of the pass line in the space surrounded by the rolls 42a and 42b.
  • the cooling device 8 is installed in the outer side of the front surface with respect to the rolling mill main body including the housing 11 and the web guides 12a to 12d, and has a plurality of water cooling nozzles arranged along the rolling line, The outer surface and the inner surface of the H flange 22 are configured to be cooled.
  • the cooling device 8 has an outer surface water cooling nozzle 8a that injects cooling water toward the outer surface of the flange 22 of the material H to be rolled, as shown in FIG.
  • the to-be-rolled material H exists in the vicinity of the horizontal rolls 41a and 41b of the 1st rough universal rolling mill 4, and the rolls 42a and 42b, and a rolling attitude
  • the web 21 is substantially parallel to the upper surface of the roller table 13.
  • the web 21 of the material to be rolled H leaves the first rough universal rolling mill 4
  • the web 21 of the material to be rolled H is substantially horizontal with respect to the upper surface of the roller table 13 that conveys the material to be rolled H. As shown in FIG.
  • the tip of the web 21 is lowered and the web is inclined.
  • the tip of the web 21 comes into contact with the roller table 13 as shown in FIG. Tilt to the same height.
  • the distance from the state of FIG. 3A to the state of FIG. 3C at this time also varies depending on the size and strength of the material H to be rolled.
  • the outer surface water-cooling nozzle 8a of the cooling device 8 has a position and orientation in which water can be poured toward the outer surface of the flange 22 in any inclined state of the web 21. Is provided.
  • the cooling device 8 includes a pair of upper and lower inner surface water cooling nozzles 8b and 8c (hereinafter referred to as upper flange inner surface water cooling nozzles 8b) that inject water toward the inner surface of the flange 22 of the material H to be rolled. And a lower flange inner surface water-cooling nozzle 8c). As shown in FIGS. 3 (a) to 3 (c), the upper flange inner surface water cooling nozzle 8b and the lower flange inner surface water cooling nozzle 8c are similar to the outer surface water cooling nozzle 8a.
  • the nozzle height direction position and the cooling water injection angle are the same, and the equipment structure can be simplified and the equipment cost can be reduced. Moreover, since the to-be-rolled material H can cool the flange of the to-be-rolled material H even if it is in the state conveyed away from the 1st rough universal rolling mill 4 and the web 21 in the inclined state, the web The equipment for supporting the web tip that is held horizontally is unnecessary, and the equipment cost can be reduced. Moreover, a cooling facility can be installed to a position away from the rolling mill, and the degree of freedom to enhance the cooling capacity is increased by increasing the cooling length.
  • the outer surface water cooling nozzle 8a, the upper flange inner surface water cooling nozzle 8b, and the lower flange inner surface water cooling nozzle 8c are only selected according to the required cooling capacity (only the outer surface water cooling nozzle 8a or the upper flange inner surface water cooling nozzle 8b and lower Only the flange inner surface water cooling nozzle 8c) may be installed, or only one of them may be used depending on the required cooling capacity.
  • the inner surface of the flange 22 of the material to be rolled H is often higher than the outer surface. This is because the inner surface of the flange receives radiant heat from a high-temperature web, whereas the outer surface of the flange does not have a high-temperature object nearby, and thus the temperature tends to decrease. Also, since the inner surface of the flange has a different rotational movement direction on the side surface of the horizontal roll and the traveling direction of the material to be rolled, slippage between the roll and the surface of the rolled material is large, and heat generation due to friction is large. Since the traveling direction of the material to be rolled is the same, the fact that frictional heat generation is small also contributes. Therefore, when only one of them is cooled, it is preferable to install or use only the upper flange inner surface water cooling nozzle 8b and the lower flange inner surface water cooling nozzle 8c so as to cool the flange inner surface having a high temperature.
  • the cooling device 8 may be installed such that the cooling angle of the cooling water from the upper flange inner surface water cooling nozzle 8b is downward from the horizontal.
  • the cooling angle of the cooling water from the upper flange inner surface water cooling nozzle 8b is downward from the horizontal.
  • the jetting angle is downward, the cooling water for cooling the inner surface of the upper flange with water is less likely to hit the web when the web is horizontal.
  • the upper flange inner surface water-cooling nozzle 8b can be installed on the left and right side guides (not shown) for guiding the material to be rolled H to the rolling mill, and there is an advantage that the equipment cost for installing the nozzle can be reduced. .
  • the lower flange inner surface water-cooling nozzle 8c has a jetting angle upward from the horizontal at a position below the upper surface of the table roller for the purpose of effectively cooling the inner surface of the lower flange without disturbing the operation of the left and right side guides. It is preferable to install so that it becomes.
  • the cooling device 8 has a horizontal upward injection angle ⁇ of the lower flange inner surface water-cooled nozzle 8 c larger than the horizontal downward injection angle ⁇ of the upper flange inner surface water-cooled nozzle 8 b. It is preferable to install in. This is because the web 21 as shown in FIG. 3 (a) is substantially horizontal in the posture of the material H to be rolled only in the vicinity of the horizontal rolls 41a and 41b and the rolls 42a and 42b. This is because the web 21 is in an inclined state on the outside. That is, in the production of T-shaped steel by hot rolling, the state in which the web 21 of the material to be rolled H is inclined is generally effective, and water cooling equipment suitable for this state is effective.
  • the lower flange inner surface water-cooling nozzle 8c is installed so that the upward upward injection angle ⁇ from the horizontal of the upper flange inner surface water-cooled nozzle 8b is larger than the horizontal downward spray angle ⁇ , the lower flange inner surface of the flange 22 of the material H to be rolled
  • the angle formed between the direction of the cooling water that cools the water and the web increases, making it difficult for the cooling water to hit the web, and thus reducing the temperature of the web that does not require cooling.
  • the angle at which the cooling water collides with the inner surface of the lower flange 22 of the material to be rolled H becomes nearly vertical, so that the cooling capacity is improved. is there.
  • each water-cooled nozzle can be determined as appropriate according to the specifications of the material to be rolled and the equipment. ⁇ is about 5 to 50 °, ⁇ is about 15 to 60 °, and the outer surface water-cooled nozzle 8a is inclined downward. The angle is preferably about 0 to 45 °. Further, ⁇ is preferably about 10 to 40 ° larger than ⁇ . As shown in FIGS. 4 and 5, the injection angle means an angle formed by a horizontal line of the center line (usually the nozzle direction) of the jet from the nozzle.
  • both the upper flange inner surface water cooling nozzle 8b and the lower flange inner surface water cooling nozzle 8c are located outside the tip of the web 21 of the material to be rolled H, and the material to be rolled H and the inner surface of the upper flange are The water cooling nozzle 8b and the lower flange inner surface water cooling nozzle 8c are in a positional relationship that hardly collides. Further, as shown in FIG. 4, as shown in FIG.
  • each water cooling nozzle of the cooling device 8 shown in FIGS. 3 to 5 is preferably a mechanism that can adjust the injection angle and can set an appropriate injection angle according to the dimensions of the T-shaped steel to be manufactured.
  • the cooling device 9 installed on the rear surface of the second rough universal rolling mill 6 also has a housing and a web guide (not shown) constituting the second rough universal rolling mill 6. And has the same configuration as the cooling device 8 shown in FIGS. 3 to 5 (outer surface water cooling nozzle 9a, upper flange inner surface water cooling nozzle 9b, lower flange inner surface water cooling nozzle 9c, etc.). Yes.
  • These cooling devices 8 and 9 cool the flange 22 of the material to be rolled H by water cooling during rolling on the front and rear surfaces of the intermediate rolling mill group 3 in the intermediate rolling process by the intermediate rolling mill group 3. Specifically, the cooling devices 8 and 9 perform the water cooling of the flange 22 in a plurality of times during the reciprocating rolling passes by the intermediate rolling mill group 3.
  • the cooling devices 8 and 9 perform the water cooling of the flange 22 in a plurality of times during the reciprocating rolling passes by the intermediate rolling mill group 3.
  • T-section steel can be smoothly manufactured while avoiding troubles caused by large cooling bends in the prior art in which the flange is cooled at once after hot rolling at the rear surface of the finish rolling mill (finish universal rolling mill) 7. .
  • the material to be rolled H bends to the flange 22 side similarly to the problem of the prior art, which hinders the rolling operation. There is. For this reason, it is necessary to cool the flange 22 in a plurality of times during rolling, and for this purpose, it is preferable to provide cooling devices 8 and 9 on the front and rear surfaces of the intermediate rolling mill group 3, respectively. However, when a necessary cooling capacity is obtained, the cooling device 8 or 9 may be provided on either the front surface or the rear surface of the intermediate rolling mill group 3.
  • cooling devices 8 and 9 it is not always necessary to use these cooling devices 8 and 9 between all the reciprocating rolling passes, and a cooling pass is appropriately selected according to the temperature of the material H to be rolled, the capacity of the cooling devices 8 and 9, etc. However, cooling may be performed between a plurality of arbitrary passes.
  • the cooling device 10 of any one of the present invention shown in FIGS. 3 to 5 is provided on the front surface of the finishing mill (finishing universal rolling mill) 7.
  • the cooling device 10 is configured to cool the flange 22 of the material to be rolled H by water cooling on the front surface of the finish rolling mill 7 in the finish rolling process.
  • the flange 22 of the material to be rolled H can be cooled even in the finish rolling step, so that it is more effective than the case where only the cooling devices 8 and 9 are provided on the front and rear surfaces of the intermediate rolling mill group 3. Cooling bend can be prevented.
  • the cooling device 10 is not necessarily provided.
  • a cooling device (not shown) for cooling the flange 22 of the rolled material H by water cooling may be provided on the rear surface of the finish rolling mill 7.
  • the length in the rolling direction of the cooling devices 8 and 9 installed on the front surface and the rear surface of the intermediate rolling mill group 3 in consideration of cooling capacity, productivity, equipment cost, and the like. For example, if the cooling device is too short and the cooling capacity is insufficient, slowing the rolling speed and making up for it will increase the rolling time and reduce productivity, so ensure that the cooling capacity is not short. It is preferable to do. On the other hand, if the cooling device is too long, the time required to pass through the cooling devices 8 and 9 is increased, so that the cooling capacity is improved. Since the distance from 3 is moved to a place far away from each other and the moving time of the material to be rolled H in the reciprocating rolling is long, productivity is lowered.
  • the length of the cooling devices 8 and 9 in the rolling direction can be set to, for example, 5 m or more and 20 m or less, but is not limited thereto. It may be determined as appropriate.
  • the rolling in the finishing mill 7 is usually one pass, and even if the rolling speed is slowed, there is little influence on the productivity, so the length of the cooling device 10 installed on the front surface of the finishing mill 7 is as follows.
  • the circumstances such as the cooling devices 8 and 9 installed on the front surface and the rear surface of the intermediate rolling mill group 3 need not be considered much. Therefore, from the viewpoint of securing the cooling capacity, it is preferable that the cooling devices 8 and 9 have a length of, for example, 5 m or more as well as the length of the cooling devices 8 and 9, but there is no particular problem even if it is less than 5 m.
  • the maximum length of the cooling device 10 may be a distance between the rear surface of the intermediate rolling mill group 3 and the front surface of the finishing mill 7.
  • the cooling devices 8 and 9 installed on the front surface and the rear surface of the intermediate rolling mill group 3 and the cooling device 10 installed on the front surface of the finish rolling mill 7 are arranged outside the rolling mill main body. Yes. This is because there is no space in the rolling mill body and it is usually difficult to install an effective cooling device. In addition to this, when the inner surface of the upper flange is cooled in the immediate vicinity of the rolling mill, the web is horizontal, so that cooling water may stay on the upper surface of the web and cause uneven cooling on the upper and lower surfaces of the web.
  • the installation of the cooling device is easy, and since the web is in a generally inclined posture, the cooling water sprayed on the inner surface of the upper flange stays on the upper surface of the web. It drains without. Therefore, it is desirable to arrange the cooling devices 8, 9, and 10 outside the rolling mill body.
  • the cooling devices 8, 9, and 10 of the present invention can be installed close to the rolling mill body because the flange can be cooled even in a posture in which the same web as the rolling posture in each rolling mill of the material H to be rolled. Can do.
  • the distance D is preferably 10 m or less. More preferably, the distance D is 5 m or less.
  • the web of the material to be rolled which is a feature of the present invention, is inclined from a substantially horizontal state with respect to the upper surface of the roller table that conveys the material to be rolled, to a state in which the front end of the web and the lower end of the flange are at the same height.
  • the cooling device and the cooling method of the present invention have the web height used for shipbuilding and the like having a flange width. This method is particularly suitable when producing a T-shaped steel of twice or more.
  • T-shaped steel with a web height of less than twice the flange width is in a state where the flange on the roller table is greatly inclined, so that the collision angle between the cooling water and the flange surface of the material to be rolled greatly deviates from the vertical, Cooling capacity may decrease.
  • the web height is T-shaped steel that is twice or more the flange width
  • a plurality of outer surface water cooling nozzles 8a, upper flange inner surface water cooling nozzles 8b, and lower flange inner surface water cooling nozzles 8c are arranged side by side to form the cooling device 8. Even if the nozzle height direction position and the cooling water injection angle are constant for each nozzle 8a, 8b, and 8c, the collision angle between the cooling water and the flange surface of the material to be rolled is appropriate in any inclined state of the web. Range.
  • each nozzle 8a, 8b, 8c has a nozzle height direction.
  • the position and the injection angle of the cooling water are constant, the present invention is not limited to this.
  • the nozzle height direction position is increased as the distance from the rolling mill body increases, and the cooling water injection angle is increased.
  • each nozzle may be installed so as to have a different position in the height direction and an injection angle according to the inclination state of the flange at the nozzle installation position.
  • the upper flange inner surface water cooling nozzle 8b and the lower flange inner surface water cooling nozzle 8c are installed at equal intervals in the rolling direction, but the arrangement is not limited thereto. That is, the nozzles 8a, 8b and 8c may be separately arranged at appropriate intervals and numbers. For example, the arrangement intervals of the nozzles in the rolling direction do not need to be equal, and it is not necessary to align the positions in the rolling direction with other nozzles. Furthermore, not only the direction of the nozzle but also the shape and size may be appropriately selected for each position in the rolling direction. However, from the viewpoint of cooling control capability, it is preferable to install the nozzles 8a to 8c between the rolls as shown in FIG. 2, and this arrangement is also adopted in the examples described later.
  • controlled rolling In order to produce a so-called high-tensile material having a high yield stress (high-tensile steel with a yield stress of 325 MPa or more), generally controlled rolling is applied in which the temperature of the material to be rolled is rolled in an unrecrystallized region or a two-phase region. .
  • controlled rolling it is necessary to perform rolling with a reduction rate (thickness reduction rate) of a certain degree or more in these temperature ranges, for example, about 30%, and accumulate strain in the material.
  • the thickness of the flange 22 and the web 21 is slightly reduced, but the reduction ratio is at most about 2 to 3%, and the reduction ratio required for controlled rolling. Can not be satisfied.
  • the temperature of the material H to be rolled needs to be lowered to the non-recrystallized region or the two-phase region during the intermediate rolling process.
  • the temperature of the flange 22 is lowered by air cooling, there is a problem that it takes a long time to reduce the productivity.
  • the flange 22 is cooled by water cooling and the temperature of the flange 22 is lowered, the waiting time is shortened and the productivity is improved, and the flange 22 is cooled faster than the cooling rate at which the web 21 is air-cooled.
  • the effect of reducing the temperature difference between the web 21 and the flange 22 is obtained, and it is effective in preventing cooling bending after rolling.
  • the flange cooling devices 8 and 9 by water cooling are installed on the front surface and the rear surface of the intermediate rolling mill group 3, respectively. Is desirable.
  • flange cooling devices 8 and 9 by water cooling are installed on the front and rear surfaces of the intermediate rolling mill group 3, and flange cooling by water cooling is performed on the front surface of the finish rolling mill 7.
  • the apparatus 10 is installed.
  • the intermediate rolling mill group 3 includes two rough universal rolling mills and one edger rolling mill, but this is an example, There is no restriction
  • the intermediate rolling mill group (UEU) 3 in which the first rough universal rolling mill 4 is disposed on the front side of the edger rolling mill 5 and the second rough universal rolling mill 6 is disposed on the rear side of the edger rolling mill 5,
  • the second bending universal rolling mills 4 and 6 can generate rolling bends on both the flange 22 side and the web 21 side, the bending 22 can be adjusted and the flange 22 can be cooled by water cooling.
  • a group of intermediate rolling mills (UE) with one stand and one edger rolling mill there is an advantage that bending control of water cooling becomes easy.
  • the first and second rough universal rolling mills 4 and 6 respectively reduce the web thickness with upper and lower horizontal rolls 41a, 41b, 61a and 61b, and the flange thickness with a horizontal roll. Since the rolls are reduced by the side surfaces of 41a, 41b, 61a, 61b and the scissors rolls 42a, 62a, the reduction ratio of the web 21 and the flange 22 can be adjusted independently. Generally, if the rolling reduction ratio of the web 21 ⁇ the rolling reduction ratio of the flange 22, the extension of the flange 22 becomes larger than that of the web 21, so that the material to be rolled H bends to the web 21 side, and conversely, the rolling reduction ratio of the flange 22 ⁇ the web 21.
  • the material to be rolled H bends to the flange 21 side.
  • the first and second rough universal rolling mills 4 and 6 can control the bending of the outlet side of the material H to be rolled.
  • the edger rolling mill 5 reduces only the end face of the flange 22, so that the bending toward the web 21 always occurs due to the reduction. Also, the flange width reduction amount of the edger rolling mill 5 needs to be an appropriate amount in order to make the flange width the target dimension, and there is little room for adjusting the reduction amount in order to control bending. From this, the intermediate rolling mill group (UEU) in which the first rough universal rolling mill 4 is disposed on the front side of the edger rolling mill 5 and the second rough universal rolling mill 6 is disposed on the rear side of the edger rolling mill 5. It is more preferable for the production of T-section steel than the intermediate rolling mill group (UE) of one rough universal rolling mill and one edger rolling mill.
  • a T-shaped steel manufacturing facility 1 shown in FIG. 1 from a bloom having a rectangular cross section with a thickness of 250 mm and a width of 310 mm, a web height of 300 mm, a flange width of 100 mm, a web thickness of 9 mm, a flange A T-shaped steel having a target thickness of 16 mm was rolled.
  • the cooling devices 8, 9, and 10 are installed before and after the intermediate rolling mill group 3 and on the front surface of the finishing rolling mill (finishing universal rolling mill) 7. These cooling devices were installed close to the outside of the rolling mill main body, and the distance D between the rolling mill main body and the cooling device was 3 m.
  • the injection direction of the flange outer surface water cooling nozzles (8a, 9a, etc.) was 10 ° downward with respect to the horizontal direction.
  • a side guide on the flange 22 side that guides the material H to be rolled into the rolling mill, and has a structure that moves in the left-right direction (web height direction) following the side guide, and the outer surface of the flange 22 of the material H to be rolled It was set as the structure by which the distance of a flange outer surface water cooling nozzle was kept constant irrespective of the cross-sectional dimension of the to-be-rolled material H.
  • the upper flange inner surface water-cooling nozzle (8b, 9b, etc.) has a structure in which the injection direction is 10 ° downward with respect to the horizontal direction and is mounted on the side guide on the tip side of the web 21 of the material to be rolled H and moves in the left-right direction.
  • Each cooling device has a structure in which a number of cooling nozzles in FIG. 5 are arranged in the rolling direction, and the entire cooling length is 10 m.
  • the rough shaping rolling mill 2 a double rolling mill having upper and lower rolls provided with a plurality of perforations was used.
  • 1st rough universal rolling mill 4 which comprises an intermediate rolling mill group, the thing of the structure shown in FIG. 6 was used.
  • the horizontal rolls 41a and 41b those having an angle from the vertical direction of the side surface (an angle formed by the vertical direction line and the side surfaces of the horizontal rolls 41a and 41b) of 7 ° were used.
  • the left and right saddle rolls 42a and 42b are arranged so as to face each other and have a vertically symmetrical mountain shape having a hypotenuse inclined at an angle of 7 ° from the vertical with the center in the width direction of the roll surface as a vertex in the cross-sectional shape.
  • those that press the side surfaces of the horizontal rolls 41a and 41b are adjusted to prevent the horizontal rolls 41a and 41b from moving in the horizontal axis direction by rolling the flange 22. .
  • the edger rolling mill 5 the one shown in FIG. 7 was used.
  • the inclination angle of the step portion was set to 7 ° from the vertical.
  • the second rough universal rolling mill 6 one having the structure shown in FIG. 8 was used.
  • the horizontal rolls 61a and 61b were inclined at an angle of 7 ° from the vertical side surface on the side where the flange 22 was rolled.
  • the left and right saddle rolls 62a and 62b one of the saddle rolls 62a that rolls the flange 22 is vertically symmetric having a hypotenuse inclined at an angle of 7 ° from the vertical with the center in the width direction of the roll surface as the apex in the cross-sectional shape.
  • the other scissor roll 62b that squeezes the tip of the web 21 in the height direction is a cylindrical shape with a flat roll surface.
  • a finishing universal rolling mill having a structure shown in FIG. 10 was used.
  • the cooling devices 8 and 9 installed on the front and rear surfaces of the intermediate rolling mill group 3 have a structure capable of cooling both the outer surface and the inner surface of the flange 22 by water cooling over a length of 10 m by a plurality of nozzles arranged in the rolling direction.
  • the cooling device 10 installed on the front surface of the finishing mill 7 has a structure in which both the outer surface and the inner surface of the flange 22 can be cooled by water cooling over a length of 10 m by a plurality of nozzles arranged in the rolling direction.
  • the bloom first heated in the heating furnace was rolled by the rough shaping rolling mill 2 to obtain a T-shaped steel piece having a substantially T-shaped cross section as shown in FIG.
  • the obtained T-shaped billet had a web thickness of 40 mm, a flange thickness of 75 mm, a web height of 375 mm, and a flange width of 130 mm.
  • the first rough universal rolling mill 4, the edger rolling mill 5, and the second rough universal rolling mill 6 are reciprocated in five passes by the intermediate rolling mill group 3 in which the first rough universal rolling mill 6 and the second rough universal rolling mill 6 are arranged in this order from the upstream side to the downstream side. Rolling was performed to reduce the web 21 and the flange 22.
  • the flange 22 of the material to be rolled H passing through the cooling devices 8 and 9 installed on the front and rear surfaces of the intermediate rolling mill group 3 was cooled by water cooling.
  • the cooling was performed on both the outer surface and the inner surface of the flange 22.
  • the finishing mill 7 rolled one pass, and the flange 22 was lightly pressed to shape the inclination vertically.
  • both the flange outer surface and the inner surface of the material to be rolled H were cooled by water cooling using the cooling device 10 installed on the front surface of the finish rolling mill 7.
  • the web part was slightly reduced.
  • the surface temperature of the material to be rolled H was measured on the rear surface of the finish rolling mill 7, the surface temperature of the flange 22 was 720 ° C, and the surface temperature of the web 21 was 725 ° C.
  • the amount of bending per length of 10 m after cooling the material to be rolled H to room temperature was as small as 5 mm or less.
  • the cooling device 10 is not installed on the front surface of the finish rolling mill 7, and the cooling devices 8 and 9 are installed only on the front surface and the rear surface of the intermediate rolling mill group 3 to roll the T-section steel.
  • the T-shaped steel was rolled in the same process as in the first example, and the flange 22 of the material to be rolled H passing through before and after the intermediate rolling mill group 3 was cooled by water cooling. ⁇ Finish rolling was carried out without water cooling in front of the finishing mill 7.
  • the surface temperature of the material to be rolled H was measured on the rear surface of the finish rolling mill 7, the surface temperature of the flange 22 was 741 ° C, and the surface temperature of the web 21 was 729 ° C.
  • the material to be rolled H after cooling was bent about 9 mm per 10 m length.
  • the bending amount of the shape steel is set to 1 mm or less per 1 m, and it was possible to make the product within the tolerance by bending it slightly to the part beyond this.
  • the cooling by water cooling of the flange 22 before and after the intermediate rolling mill group 3 and in front of the finish rolling mill 7 is not performed, but the water is cooled at the rear surface of the finishing mill 7 and the same hot rolling process is performed.
  • the shape steel was rolled.
  • the surface temperature of the material H to be rolled immediately after the finishing mill 7 was measured, the surface of the flange 22 was 833 ° C., and the web 21 was 735 ° C.
  • T-section steel manufacturing equipment and manufacturing method of the present invention it is possible to manufacture a large amount of T-section steel at low cost by hot rolling while preventing bending due to cooling that hinders productivity. It becomes possible.

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Abstract

L’invention divulgue un dispositif de refroidissement (8) dans une ligne de laminage à chaud de profilés en T qui est capable de minimiser le cambrage dû au refroidissement, qui est provoqué par la différence de température entre une aile et une âme, le dispositif de refroidissement comprenant une buse de refroidissement à l’eau pour surface extérieure (8a) pour refroidir la surface extérieure de l'aile d’un matériau à laminer (H), laquelle buse comprenant une âme à section transversale approximativement en forme de T (21) et une aile (22), par refroidissement à l’eau, et/ou une buse de refroidissement à l’eau pour surface intérieure pour refroidir la surface intérieure de l'aile du matériau à laminer par refroidissement à l’eau. La buse de refroidissement à l’eau de surface extérieure et/ou la buse de refroidissement à l’eau de surface intérieure est/sont disposée(s) dans la position et la direction dans lesquelles la/les buse(s) peu(ven)t injecter de l’eau en direction de la surface extérieure et/ou de la surface intérieure de l'aile dans n’importe quel état incliné de l'âme du matériau à laminer lorsque l'âme est inclinée à partir de l’état dans lequel l'âme est approximativement horizontale sur une table à rouleaux (13) qui porte le matériau à laminer jusqu’à l’état dans lequel la pointe de l'âme et l’extrémité inférieure de l'aile se trouvent au même niveau.
PCT/JP2009/070085 2008-11-28 2009-11-24 Dispositif de refroidissement dans une ligne de laminage à chaud de profilés en t, installation de fabrication et procédé de fabrication de profilés en t WO2010061946A1 (fr)

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JP2009263785A JP4623230B2 (ja) 2008-11-28 2009-11-19 Ｔ形鋼熱間圧延ラインの冷却装置、ｔ形鋼の製造設備及び製造方法

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CN113245381B (zh) * 2020-03-24 2022-11-18 宝山钢铁股份有限公司 一种无缝钢管定径后的在线冷却系统及其冷却方法
CN113059004A (zh) * 2021-03-16 2021-07-02 攀钢集团攀枝花钢铁研究院有限公司 一种型钢的轧制方法

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