EP3593915A1 - Procédé de fabrication d'acier à section en forme de h - Google Patents

Procédé de fabrication d'acier à section en forme de h Download PDF

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Publication number
EP3593915A1
EP3593915A1 EP18806758.1A EP18806758A EP3593915A1 EP 3593915 A1 EP3593915 A1 EP 3593915A1 EP 18806758 A EP18806758 A EP 18806758A EP 3593915 A1 EP3593915 A1 EP 3593915A1
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EP
European Patent Office
Prior art keywords
rolling
rolled
caliber
edging
raised part
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP18806758.1A
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German (de)
English (en)
Inventor
Hiroshi Yamashita
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Nippon Steel Corp
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Nippon Steel Corp
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Publication of EP3593915A1 publication Critical patent/EP3593915A1/fr
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    • 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
    • B21B1/088—H- or I-sections

Definitions

  • the present invention relates to a production method for producing H-shaped steel using, for example, a slab having a rectangular cross section or the like as a raw material.
  • a raw material such as a slab or a bloom extracted from a heating furnace is shaped into a raw blank (a material to be rolled in a so-called dog-bone shape) by a rough rolling mill (BD).
  • BD rough rolling mill
  • a web and flanges of the raw blank are subjected to reduction in thickness by an intermediate universal rolling mill, and flanges of the material to be rolled are subjected to width reduction and forging and shaping of end surfaces by an edger rolling mill close to the intermediate universal rolling mill.
  • an H-shaped steel product is shaped by a finishing universal rolling mill.
  • an H-shaped steel product with a larger size is required. Accordingly, it is studied to produce an H-shaped steel product from a slab raw material with a size larger than a conventional one.
  • a large-size raw material is used as a material to be rolled, various problems such as elongation in a web height direction and deformation of the flange corresponding part may arise, and correction of the shape is sometimes required.
  • Patent Document 1 discloses a technique in which groove parts are formed on a middle part of a flat shaping caliber, and an unreduced portion is provided at the middle of a web corresponding part when performing rolling, thereby reducing a length of a crop part.
  • This Patent Document 1 describes that edging rolling is performed in a state where a protruding part (corresponding to a raised part of the present invention) is formed at the middle of the web corresponding part, and further reduction in the crop part and efficiency of the rolling are realized.
  • Patent Document 2 discloses a width-widening rolling method for performing shaping processing in an advantageous manner on shaped blooms in a production process of shape steel.
  • this Patent Document 2 discloses a rolling method in which local rolling is performed on a web corresponding part, rolling for flattening a protruding part at the middle of the web corresponding part and widening a width is then performed, and after that, a material to be rolled is erected and subjected to edging rolling. It is described that according to this method, a lot of kinds of shaped blooms can be produced by adjusting a flange width, a web thickness, and a web height.
  • Patent Document 1 is a technique of reducing the length of the crop part
  • Patent Document 1 does not disclose at all the technical idea such that a material to be rolled with a large flange width is shaped, and does not mention at all the performance of the above-described "supplementary edging rolling", and the deterioration of the material passing property and the deterioration of the shape of the material to be rolled which become problems when performing the supplementary edging rolling.
  • an object of the present invention is to provide a method for producing H-shaped steel capable of suppressing deterioration of a material passing property and deterioration of a shape of a material to be rolled in "supplementary edging rolling" in which light reduction rolling is performed by returning the material to be rolled to an edging caliber after forming a raised part on a web in flat shaping and rolling, to stabilize the supplementary edging rolling.
  • a method for producing H-shaped steel including: a rough rolling step; an intermediate rolling step; and a finish rolling step, wherein: the rough rolling step includes: an edging rolling step of rolling and shaping a material to be rolled into a predetermined dog-bone shape; a raised part generating step of performing rolling of a web part by making the material to be rolled after completion of the edging rolling step to be rotated by 90° or 270°, and forming a raised part at a middle of the web part of the material to be rolled; a supplementary edging rolling step of performing light reduction rolling by making the material to be rolled after being rolled in one pass or more in the raised part generating step to be rotated by 90° or 270° again and returning the material to be rolled to a final caliber in the edging rolling step; and a raised part eliminating step of reducing and eliminating the raised part formed in the raised part generating step; in upper and lower caliber rolls which perform
  • the light reduction rolling may be performed so as to make the tips of the flange parts of the material to be rolled fill the final caliber in the edging rolling step.
  • the light reduction rolling may be performed so as to make a web height of the material to be rolled to be smaller than a web height of the material to be rolled supplied to a caliber which performs the raised part generating step right before the supplementary edging rolling step.
  • the supplementary edging rolling step may be performed in one chance or two chances when one set of plural passes in which an edging height in a final pass is set to be constant is set to one chance.
  • a width of the raised part formed in the raised part generating step may be set to 25% or more and 50% or less of a web part inner size of the material to be rolled.
  • supplementary edging rolling in which light reduction rolling is performed by returning the material to be rolled to an edging caliber after forming a raised part on a web in flat shaping and rolling, to stabilize the supplementary edging rolling.
  • FIG. 1 is an explanatory view about a production line T for H-shaped steel including a rolling facility 1 according to the present embodiment.
  • a heating furnace 2 As illustrated in FIG. 1 , in the production line T, a heating furnace 2, a sizing mill 3, a rough rolling mill 4, an intermediate universal rolling mill 5, and a finishing universal rolling mill 8 are arranged in order from the upstream side. Further, an edger rolling mill 9 is provided close to the intermediate universal rolling mill 5.
  • a steel material in the production line T is collectively described as a "material to be rolled A" for explanation and its shape is appropriately illustrated using broken lines, oblique lines and the like in some cases in the respective drawings.
  • a rectangular cross-section raw material (a later-described material to be rolled A) being a slab 11 extracted from the heating furnace 2 is subjected to rough rolling in the sizing mill 3 and the rough rolling mill 4. Then, the rectangular cross-section raw material is subjected to intermediate rolling in the intermediate universal rolling mill 5. During the intermediate rolling, reduction is performed on a flange tip part (a flange corresponding part 12) of the material to be rolled by the edger rolling mill 9 as necessary.
  • an edging caliber and a so-called flat shaping caliber of thinning a web portion to form a shape of a flange portion are engraved on rolls of the sizing mill 3 and the rough rolling mill 4.
  • An H-shaped raw blank 13 is shaped by reverse rolling in plural passes through these sizing mill 3 and rough rolling mill 4.
  • the H-shaped raw blank 13 is subjected to application of reduction in plural passes using a rolling mill train composed of two rolling mills of the intermediate universal rolling mill 5 and the edger rolling mill 9, whereby an intermediate material 14 is shaped.
  • the intermediate material 14 is subjected to finish rolling into a product shape in the finishing universal rolling mill 8, whereby an H-shaped steel product 16 is produced.
  • a slab thickness of the slab 11 extracted from the heating furnace 2 is, for example, within a range of 290 mm or more and 310 mm or less. This is the dimension of a slab raw material called a so-called 300 thick slab used when producing a large-size H-shaped steel product.
  • an edging rolling step is first performed as a pre-stage step.
  • rolling and shaping is performed in a state where the raw material having the rectangular cross section (slab 11) is erected, to thereby shape the raw material into a predetermined almost dog-bone shape.
  • a flat shaping and rolling step is performed as a post-stage step.
  • the material to be rolled A after being subjected to the edging rolling step is first rotated by 90° or 270°.
  • the flange parts located at the upper and lower ends of the material to be rolled A (slab 11) in the edging rolling step are located on a rolling pitch line.
  • reduction of a web part being a connecting part connecting the flange parts at two positions is performed.
  • the above pre-stage step and post-stage step are collectively referred to as a rough rolling step.
  • the edging rolling step being the pre-stage step in the rough rolling step is only required to be performed by a conventionally-known general method. Accordingly, detailed explanation regarding the edging rolling step will be omitted in the present description.
  • the flat shaping and rolling step being the post-stage step will be described in detail while referring to the drawings.
  • FIG. 2 and FIG. 3 are schematic explanatory views of a first flat shaping caliber KH1 and a second flat shaping caliber KH2 used in the flat shaping and rolling step.
  • the first flat shaping caliber KH1 is composed of an upper caliber roll 85 and a lower caliber roll 86 which are a pair of horizontal rolls.
  • the material to be rolled A rolled and shaped in the edging rolling step is rotated by 90° or 270°, whereby the flange parts 80 located at the upper and lower ends of the material to be rolled A until the above pre-stage step are located on a rolling pitch line.
  • reduction of a web part 82 being a connecting part connecting the flange parts 80 at two positions is performed.
  • the upper and lower caliber rolls 85, 86 of the first flat shaping caliber KH1 have shapes formed with recessed parts 85a, 86a of a predetermined length L1 at their roll barrel length middle parts.
  • the reduction of the web part 82 is partially performed.
  • reduced portions 82a at both ends in the web height direction and a raised part 82b as an unreduced portion at the middle part thereof are formed.
  • the rolling and shaping of forming the raised part 82b in the web part 82 is performed in a material to be rolled in a so-called dog-bone shape.
  • the step of forming the raised part 82b in the web part 82 in the first flat shaping caliber KH1 is also described as a "raised part generating step".
  • the width length of the raised part 82b after the formation is the same length as the width length L1 of the recessed parts 85a, 86a.
  • the width length L1 of the recessed parts 85a, 86a in the present description is defined as a width length at a depth of 1/2 of a depth hm of the recessed parts 85a, 86a.
  • the later-described escaping amount L1 is also based on the same definition.
  • FIG. 3 is a schematic explanatory view of the second flat shaping caliber KH2.
  • the second flat shaping caliber KH2 is composed of an upper caliber roll 95 and a lower caliber roll 96 which are a pair of horizontal rolls.
  • the rolling and shaping of eliminating the raised part 82b formed in the web part 82 and widening the inner size of the web part 82 is performed on the material to be rolled A rolled and shaped in the first flat shaping caliber KH1.
  • the rolling of bringing the upper and lower caliber rolls 95, 96 into contact with the raised part 82b formed in the web part 82 to reduce (eliminate) the raised part 82b is performed.
  • the step of reducing (eliminating) the raised part 82b in the second flat shaping caliber KH2 is also described as a "raised part eliminating step”.
  • the second flat shaping caliber KH2 eliminates the raised part 82b formed in the web part 82, so that it is also referred to as a "raised part eliminating caliber".
  • the H-shaped raw blank 13 shaped by being passed through these first flat shaping caliber KH1 and second flat shaping caliber KH2 is subjected to application of reverse rolling in plural passes using the rolling mill train composed of two rolling mills of the intermediate universal rolling mill 5 and the edger rolling mill 9, whereby an intermediate material 14 is shaped. Subsequently, the intermediate material 14 is subjected to finish rolling into a product shape in the finishing universal rolling mill 8, whereby an H-shaped steel product 16 is produced (refer to FIG. 1 ).
  • FIG. 4 is a schematic view of a final caliber KE in an edging rolling step (also described as an edging final caliber KE, hereinafter) of a rough rolling step in production of H-shaped steel.
  • the edging final caliber KE is engraved on an upper caliber roll 50 and a lower caliber roll 51 which are a pair of horizontal rolls.
  • a peripheral surface of the upper caliber roll 50 (namely, a caliber upper surface) is formed with a projection 55 protruding toward the inside of the caliber.
  • a peripheral surface of the lower caliber roll 51 (namely, a caliber bottom surface) is formed with a projection 56 protruding toward the inside of the caliber.
  • These projections 55, 56 have tapered shapes, and dimensions such as a protrusion length of the projection 55 and the projection 56 are configured to be equal to each other.
  • FIGS. 5 are schematic explanatory views regarding supplementary edging rolling between the edging final caliber KE and a general flat shaping caliber GH, in which FIG. 5(a) illustrates a state before performing the supplementary edging rolling, and FIG. 5(b) illustrates a state of performing the supplementary edging rolling.
  • FIG. 5(a) illustrates a state before performing the supplementary edging rolling
  • FIG. 5(b) illustrates a state of performing the supplementary edging rolling.
  • FIGS. 6 are schematic explanatory views of the supplementary edging rolling according to the present embodiment, in which FIG. 6(a) illustrates a state before performing the supplementary edging rolling, and FIG. 6(b) illustrates a state of performing the supplementary edging rolling.
  • the raised part 82b is generated when reducing the web thickness. Accordingly, pulldown of the flange parts 80 is difficult to occur, and a decrease rate of the flange width is lowered. For this reason, as illustrated in FIG. 6(b) , the width length of the flange parts 80 does not become small almost at all. Since the change in the flange width is small, restraining force of side wall parts of the caliber when the material to be rolled is returned to the edging final caliber KE and the supplementary edging rolling is performed, is also maintained.
  • the caliber restraining force is desirably set to be as small as possible.
  • an optimum value of the edging amount during the supplementary edging rolling should be set by considering a balance between occurrence of flaws and the rolling stability.
  • the rolling of the web part 82 is supposed to be plate rolling. Based on a dimensional relationship between a roll diameter of a normal shape steel rolling mill and a material to be rolled of large-size H-shaped steel, a plate width ratio is about 3 to 4, and a plate thickness ratio is about 4 to 5. Besides, since flange parts are provided at both ends in the plate thickness, a spread amount is further increased. As a result of this, a rate of spread in the web height direction of the material to be rolled A due to the web reduction is 4% or more of the web height. Namely, when considering the material to be rolled A with a web height dimension of 1000 mm, for example, as large-size H-shaped steel, a rate of spread of the web height is at least 40 mm.
  • the material to be rolled is in a state of being in contact with caliber side walls at a roll outlet side in the flat shaping and rolling, and thus from a viewpoint of material passing property and the like, there is no chance that the material passing property is impaired.
  • the edging amount during the supplementary edging rolling is preferably set to 40 mm or less.
  • a flange width spread in accordance with the edging rolling it is possible to apply a width spread rolling characteristic based on slab edging.
  • a flange width spread characteristic based on a conventional slab edging method performed by a caliber which is a so-called box caliber having a projection at a middle part thereof is applied.
  • FIG. 7 is a graph indicating changes in flange width of the material to be rolled A for each pass when plural passes are completed during the flat shaping and rolling. Note that the example in FIG. 7 indicates data in a case where a FEM calculation is performed by using a slab having a cross section of 2000 mm ⁇ 300 mm as a raw material.
  • flat shaping and rolling in the conventional general flat shaping caliber GH referred to as a "conventional method”, hereinafter
  • flat shaping and rolling in the first flat shaping caliber KH1 according to the present embodiment referred to as a "method of the present invention", hereinafter
  • a flange width decrease rate due to the flat shaping and rolling according to the present embodiment was smaller than a flange width decrease rate based on the conventional method.
  • a difference in flange width between the flat shaping and rolling according to the present embodiment and the conventional flat shaping and rolling was 100 mm or more.
  • the present inventors confirmed, also by experiments, that the material passing property is different according to the filling property in the caliber during the supplementary edging rolling, and there is a problem in the material passing property when the caliber is not filled.
  • Table 1 to be presented below indicates experimental examples showing a relationship between the caliber filling property and the material passing property in the supplementary edging rolling.
  • Table 1 indicates a relationship between the caliber filling property and the material passing property in the conventional method and the method of the present invention under conditions of a case 1 to a case 4. Note that during the supplementary edging rolling, edging rolling with an edging amount of about 40 mm was performed in two passes in all of the cases 1 to 4.
  • the present inventors thought that the effect of suppressing the dimensional error and the shape defect differs depending on a schedule design (a reduction amount, a pass schedule, and so on) of the supplementary edging rolling according to the present embodiment. Accordingly, they verified, based on experiments, changes in flange width caused by the supplementary edging rolling in a case of producing H-shaped steel by using a slab having a cross section of 2000 mm ⁇ 300 mm as a raw material.
  • Table 2 to be presented below indicates changes in flange width for each pass when performing flat shaping and rolling by the first flat shaping caliber KH1 (namely, the web partial rolling caliber). Cases 1 to 3 in Table 2 differ in the number of times of performing the supplementary edging rolling for each pass of the flat shaping and rolling. When the supplementary edging rolling is performed (namely, the case 2 and the case 3), changes in flange width after performing the supplementary edging rolling are indicated. Further, the description of 15th pass to 23rd pass in Table indicates that edging rolling was performed at a previous stage as first to 14th passes before the flat shaping and rolling, and indicates that the 15th pass and thereafter correspond to the flat shaping and rolling.
  • the edging rolling of about 40 mm was performed. Concretely, in the case 2, the edging rolling of about 40 mm was performed one time in two passes. In the case 3, the edging rolling of about 20 mm was performed two times continuously in two passes. As indicated in Table 2, a spread amount of the flange width realized by the supplementary edging rolling was about 24 mm in each pass in the case 2, and it was about 44 mm in each pass in the case 3.
  • case 2 supplementary edging rolling of one time
  • case 3 supplementary edging rolling of two times
  • Table 2 indicate the number of times of the supplementary edging rolling performed in two passes which are set as one set
  • the descriptions of the number of times of the supplementary edging rolling in two passes which are set as one set are also described as "one chance", "two chances”.
  • the number of times of passes of the supplementary edging rolling in one chance may be one or plural such as two or more, but, the pass schedule is designed by setting that the total edging amount satisfies a certain condition (namely, a condition that an edging height in a final pass is set to be constant).
  • Table 2 presents, for reference, changes in flange width in each pass when performing the flat shaping and rolling without performing the supplementary edging rolling, as the case 1.
  • the case 2 in Table 2 indicates flange widths when the supplementary edging rolling under a condition where the spread of the flange width is not restricted is performed by only one chance in each pass indicated in the case 1.
  • the flange width after the supplementary edging rolling was less than the edging caliber width (1010 mm) before the flat shaping and rolling, so that the edging final caliber KE is not filled during the supplementary edging rolling, which may cause the dimensional error and the shape defect.
  • the description of " ⁇ " in Table 2 indicates that the caliber is not filled, and thus there is a problem in the rolling stability.
  • the present inventors also conducted verification regarding a case of performing the supplementary edging rolling in two chances (supplementary edging rolling of two times in Table), as indicated in the case 3 in Table 2.
  • the case 3 indicates flange widths after increasing the number of times of supplementary edging rolling in the 18th pass in which the caliber was not filled in the case 2 and thereafter and performing the supplementary edging rolling under a condition where the spread of the flange width is not restricted in two chances.
  • the filling in caliber in the edging final caliber KE during the supplementary edging rolling can be realized even in a further subsequent-stage pass.
  • the filling in caliber is realized in the edging final caliber KE during the supplementary edging rolling until the 22nd pass, as indicated in Table 2.
  • the supplementary edging rolling is stably performed in further subsequent-stage passes in the flat shaping and rolling. This is because as the supplementary edging rolling is performed more in the subsequent-stage passes of the flat shaping and rolling, the dimensional accuracy of the shape of the material to be rolled which is sent for the intermediate rolling and finish rolling being further subsequent-steps improves, resulting in that the rolling stability and the improvement in product dimension accuracy are realized.
  • Table 3 to be presented below indicates, for reference, changes in flange width after the flat shaping and rolling in the conventional method (case 1) and changes in flange width when a flange width spread during the supplementary edging rolling after the supplementary edging rolling is performed after each pass is taken into consideration (case 2).
  • the flange width after the supplementary edging rolling is greater than the edging caliber width (1010 mm) before the flat shaping and rolling only in the 15th pass, in which the filling in caliber is realized in the edging final caliber KE during the supplementary edging rolling.
  • the flange width after the supplementary edging rolling is less than the flange width (1010 mm) before the flat shaping and rolling, so that the edging final caliber KE is not filled during the supplementary edging rolling, which may cause the dimensional error and the shape defect.
  • [Table 3] CASE 1 ABSENCE OF SUPPLEMENTARY EDGING ROLLING CASE 2 SUPPLEMENTARY EDGING ROLLING OF ONE TIME 15TH PASS 992 1016 ⁇ 16TH PASS 975 999 ⁇ 17TH PASS 951 975 ⁇ 18TH PASS 935 959 ⁇ 19TH PASS 924 948 ⁇ UNIT: mm
  • the raised part 82b is formed at the middle of the web part 82 of the material to be rolled A.
  • the formed raised part 82b is eliminated in the second flat shaping caliber KH2 at the subsequent stage. Then, the widening rolling of the web inner size is performed as needed after the elimination of the raised part, to thereby shape the H-shaped raw blank.
  • the width length L1 of the raised part 82b formed in the first flat shaping caliber KH1 (namely, the escaping amount of the web inner size in the rolling and shaping in the first flat shaping caliber KH1, which is also simply referred to as "escaping amount", hereinafter) is changed to result in a difference in the flange width of the finally obtained H-shaped raw blank.
  • escaping amount the width length L1 of the raised part 82b formed in the first flat shaping caliber KH1
  • the flange thickness amount is more easily ensured with an increase in the width length L1 of the raised part 82b, and, on the other hand, the flange width decreases by the drawing action in the longitudinal direction of the material to be rolled A at the time of the subsequent elimination of the raised part.
  • the present inventors verified the relationship between the escaping amount of the web inner size in the rolling and shaping in the first flat shaping caliber KH1 and the flange width of the finally obtained H-shaped raw blank.
  • FIG. 8 is a graph indicating changes in the flange width for each pass in the case where the H-shaped raw blank is shaped by the rolling and shaping in 18 passes in total using the first flat shaping caliber KH1 and the second flat shaping caliber KH2 according to the present embodiment, and three more widening calibers at subsequent stages. Note that FIG. 8 is data using a raw material slab having a width of about 2000 mm.
  • the horizontal axis in the graph of FIG. 8 indicates 1 to 18 passes, 1 to 13 passes of them correspond to the first flat shaping caliber KH1, 14, 15 passes correspond to the second flat shaping caliber KH2, and 16 to 18 passes correspond to the calibers of the widening rolling.
  • FIG. 8 further illustrates each data in the case of changing the above escaping amount L1.
  • a value expressed in the following Expression (1) is defined as an escaping percentage
  • data regarding the cases of escaping percentages of 12%, 17%, 23%, 28%, 33%, 39%, 44%, 49% is illustrated, and the case of an escaping percentage of 0% is indicated as the conventional method.
  • Escaping percentage % escaping amount L 1 / web inner size L 2 ⁇ 100
  • the thickness decrease amount at the flange part 80 (a decrease amount of the flange thickness amount) in the first flat shaping caliber KH1 is decreased by increasing the escaping percentage. For this reason, the flange width of the finally obtained H-shaped raw blank tends to increase together with the increase in escaping percentage as illustrated in FIG. 8 . This tendency was recognized also by the experiments, as illustrated in FIG. 8 . However, the flange width through the elimination of the raised part and the widening rolling in the second flat shaping caliber KH2 thereafter did not always increase even if the escaping percentage is increased to a predetermined value or more. This is estimated to be attributed to the increase in the flange thickness decrease amount at the time of the elimination of the raised part in the second flat shaping caliber KH2 in the case where an escaping part is made large.
  • FIG. 9 is a graph indicating the relationship between the escaping percentage and the flange width increase/decrease rate after the shaping of the H-shaped raw blank on the basis of the data in FIG. 8 .
  • the flange width increase/decrease rate in FIG. 9 is a value indicating the flange width in the case where the escaping percentage is each value (12% to 55%) using the flange width in the case of the escaping percentage of 0% as a reference (1.000).
  • the flange width of the H-shaped raw blank tends to increase with an increase in the escaping percentage.
  • the flange width increase/decrease rate indicates an almost fixed value (refer to a broken line part in FIG. 9 ).
  • the numerical value range of the escaping percentage is desirably set to 25% to 50%. Further, from the viewpoints of preventing an increase in rolling load and of increasing the production efficiency in the rolling and shaping process, the escaping percentage is preferably set to a value as low as possible, and therefore it is desirable to set the escaping percentage to about 25%.
  • the flat shaping and rolling performed after the edging rolling is carried out by using the first flat shaping caliber KH1 which forms the raised part 82b. Consequently, it becomes possible to suppress deterioration of the material passing property and deterioration of the shape of the material to be rolled in the "supplementary edging rolling" in which the light reduction rolling is performed by returning the material to be rolled A to the edging final caliber KE after the flat shaping and rolling, to thereby stabilize the supplementary edging rolling. Further, it becomes possible to roll and shape the H-shaped raw blank 13 having a larger flange width as compared with the conventional one, resulting in that it becomes possible to produce an H-shaped steel product having a larger flange width as compared with the conventional one.
  • the escaping percentage to fall within a range of 25% to 50% (more preferably about 25%) in the formation of the raised part 82b, it is possible to maximize the flange width of the H-shaped raw blank to be rolled and shaped.
  • the rolling and shaping is performed on the rectangular cross-section raw material (slab) through the edging rolling as a previous stage of performing the flat shaping and rolling using the first flat shaping caliber KH1, and then the flat shaping and rolling is performed, but, the applicable range of the technique of the present invention is not limited to this. Specifically, the technique of the present invention is also applicable to a case where flat shaping and rolling is performed on a material to be rolled which is not subjected to an edging rolling step such as a beam blank.
  • the present invention is applicable to a production method for producing H-shaped steel using, for example, a slab having a rectangular cross section or the like as a raw material.

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EP18806758.1A 2017-05-24 2018-05-23 Procédé de fabrication d'acier à section en forme de h Withdrawn EP3593915A1 (fr)

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CN203030624U (zh) * 2013-01-24 2013-07-03 中冶赛迪工程技术股份有限公司 H型钢的x-i短流程轧制机组
CN205673363U (zh) * 2016-03-29 2016-11-09 中冶华天南京工程技术有限公司 大h型钢精轧机组以及大h型钢轧机系统
JP6434461B2 (ja) * 2016-08-10 2018-12-05 新日鐵住金株式会社 Ｈ形鋼の製造方法

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CN110636908A (zh) 2019-12-31
JP6458917B1 (ja) 2019-01-30

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