KR101840690B1 - Production method of h-shaped steel with a roll mark - Google Patents

Production method of h-shaped steel with a roll mark Download PDF

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KR101840690B1
KR101840690B1 KR1020160008586A KR20160008586A KR101840690B1 KR 101840690 B1 KR101840690 B1 KR 101840690B1 KR 1020160008586 A KR1020160008586 A KR 1020160008586A KR 20160008586 A KR20160008586 A KR 20160008586A KR 101840690 B1 KR101840690 B1 KR 101840690B1
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web
steel material
height
roll
flange
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KR1020160008586A
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Korean (ko)
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KR20160092499A (en
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하야토 마에노
린야 고조
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제이에프이 스틸 가부시키가이샤
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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
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/227—Surface roughening or texturing
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/005—Rolls with a roughened or textured surface; Methods for making same
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)

Abstract

[PROBLEMS] To provide a method of producing an H-shaped steel to which a clear roll mark is added.
A method of manufacturing an H-shaped steel sheet with a roll mark is characterized in that the engraved portion C having a shape corresponding to a target roll mark is formed on one vertical roll 5a And a pair of vertical rolls 5a and a pair of vertical rolls 5b which are paired with one of the vertical rolls 5a are arranged at predetermined intervals, The width of the web 2 of the steel material 1 is reduced and the height of the web 2 is reduced and at the same time the engraved portion C is pressed against one side of the steel material 1 The roll mark is formed on the outer surface of one of the flanges 3a.

Figure R1020160008586

Description

Technical Field [0001] The present invention relates to a method of manufacturing an H-

The present invention relates to a method of manufacturing an H-shaped steel with a roll mark.

In the United States and South Korea, it is required to display the manufacturer name or the manufacturer's mark thereof in the form of a roll mark on the section steel products in the form of roll marks. In response to this, for example, Is known.

However, even if a roll mark is added to the H-shaped steel using the technique of Patent Document 1, there is a case that the roll mark actually imprinted is unclear, and further improvement technique has been demanded.

Japanese Patent Application Laid-Open No. 2000-51902

SUMMARY OF THE INVENTION The present invention has been made in view of the above problem, and it is an object of the present invention to provide a method of manufacturing an H-shaped steel sheet with a roll mark capable of adding a clear roll mark to an H-shaped steel.

In order to solve the above problems, in any of the embodiments according to the method for producing an H-shaped steel sheet with a roll mark of the present invention, the engraved portion of the shape corresponding to the target roll mark is located at the height of the center in the vertical direction of the peripheral surface A vertical roll formed on one side and a pair of vertical rolls paired with one of the vertical rolls are arranged at predetermined intervals and a steel material serving as an H-shaped steel product is passed between the pair of vertical rolls, A step of reducing the width of the web of the steel material to reduce the height of the web and bringing the engraved portion into contact with the outer surface of the flange of the steel to form a roll mark on the outer surface of the flange It is essential to include.

Therefore, according to the present invention, it is possible to provide a method for producing an H-shaped steel to which a clear roll mark is added.

1 is a perspective view schematically illustrating a state in which a steel material passes through a finishing mill in a method of manufacturing an H-shaped steel sheet with a roll mark according to an embodiment of the present invention.
2 is a perspective view schematically showing an equipment for manufacturing an H-shaped steel sheet with a roll mark according to an embodiment of the present invention.
3 is a cross-sectional view showing a state in which a steel material passing through a finishing mill is sectioned in a plane orthogonal to a traveling direction of the steel material.
4 is a cross-sectional view showing a state in which a steel material passing through a finishing mill is sectioned in a plane parallel to the traveling direction of the steel material at a height in the vertical direction of the pair of flanges.
Fig. 5 (a) is a front view showing a state in which a steel material before being fed into a finishing mill is viewed from the front in a traveling direction of the steel material, Fig. 5 (b) Fig. 5C is a front view showing a state in which the steel material fed out of the finishing mill is viewed from the front in the traveling direction of the steel material. Fig.
6 is a diagram showing the positional relationship between the steel material before and after finish rolling and the horizontal roll in finish rolling.
7 (a) is an enlarged perspective view of a part of a flange of a steel material obtained by the method of manufacturing an H-shaped steel sheet with a roll mark according to an embodiment of the present invention, and Fig. 7 Fig. 2 is an enlarged perspective view of a part of a flange of a steel material obtained by the method of manufacturing a steel according to the present invention.
8 is a cross-sectional view showing a state in which a steel material passing through a finishing mill is subjected to a flattening in a plane parallel to the progressing direction of the steel material at the height of the center of the pair of flanges in the vertical direction .

(Mode for carrying out the invention)

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. It should be noted, however, that the drawings are schematic and that the relationship between the thickness and the planar dimensions, the ratio of the thicknesses of the respective devices and the respective members, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be judged based on the following description. It is needless to say that the drawings also include portions where the relationship and the ratio of the dimensions are different from each other. Further, the directions of "left and right" and "up and down" in the following description are merely definitions for convenience of explanation, and do not limit the technical idea of the present invention. Therefore, for example, when the paper surface is rotated 90 degrees, "left and right" and "up and down" are read in exchange. When the paper is rotated 180 degrees, "left" Of course.

A method of manufacturing an H-shaped steel sheet with a roll mark according to an embodiment of the present invention includes a pair of separable widthwise horizontal rolls 4a and 4b symmetrically disposed on upper and lower sides of a steel material, And a pair of vertical rolls 5a and 5b symmetrically arranged on the right and left sides of the steel material, respectively. The finish rolling is performed using a universal finish rolling mill 10. 1, the structure of a housing, a bearing, and the like other than the horizontal roll and the vertical roll of the finishing mill 10 is omitted for the sake of explanation. First, the rolling equipment of the H-shaped steel including the finishing mill 10 will be described.

As shown in Fig. 2, the rolling equipment of the H-shaped steel is provided on the upstream side (left side in Fig. 2) of the equipment, and the steel material 1 such as a bloom or a beam blank, A break-down rolling mill 7 for rolling the intermediate rolling mill 8, a universal intermediate rolling mill 8 provided at the rear end of the brake-down rolling mill 7 for performing intermediate rolling on the steel 1, An edging mill 9 provided at the rear end and a finishing mill 10 installed at the rear end of the edge mill 9 for performing finish rolling on the steel 1.

The steel material 1 charged into the rolling facility is subjected to the heating treatment and the descaling treatment first and then the shape of the cross section of the steel material 1 in the plane orthogonal to the traveling direction of the steel material 1 is changed to the H- Rolled so that the web and flange are further shaped by the intermediate mill 8 and the edge mill 9 so that the web and flange are close to the product dimensions. The steel material 1 is thereafter subjected to hot rolling by the finishing mill 10 to have a target dimension of the product before cooling and a desired roll mark is added. The finished steel material 1 is cooled and is subjected to a predetermined treatment for calibrating the shape, and is then completed as a rolled H-shaped steel sheet as a final product.

The intermediate rolling mill 8 has a pair of horizontal rolls 4a and 4b and a pair of vertical rolls 5a and 5b in the same manner as the finish rolling mill 10. The respective main surfaces of the pair of vertical rolls 5a and 5b of the intermediate rolling mill 8 contacting the steel 1 prevent scratches on the inner surface of the flange when the steel 1 is rolled, Is formed so as to be inclined with respect to a plane parallel or vertically arranged with respect to the traveling direction of the steel material (1) in order to improve the meshing property at the time of transmission to the finishing mill (10).

The side surfaces of the pair of horizontal rolls 4a and 4b of the intermediate rolling mill 8 that are in contact with the inner surface of the flange are also formed to be inclined in the same manner as the pair of vertical rolls 5a and 5b. Therefore, the pair of flanges 3a and 3b of the steel material 1 having passed through the intermediate rolling mill 8 are arranged such that the upper half of the flange 3a and the upper flange 3a of the steel material 1 As shown in Fig. 4A. As shown in Fig. The lower half of the pair of flanges 3a and 3b of the steel material 1 is formed symmetrically with respect to the upper half so as to protrude outwardly as it goes downward from the central position in the vertical direction of the steel material 1. [ Therefore, the pair of flanges (3a, 3b) before being rolled with the finishing mill (10) are inclined outward at an approximately constant angle (? 1) at the upper half and lower half, respectively.

Next, the finishing mill 10 will be described. The main surfaces of the pair of vertical rolls 5a and 5b of the finish rolling mill 10 are formed such that the cross sections of the flanges 3a and 3b pressed down by the vertical rolls 5a and 5b are approximately And are formed to have substantially the same diameter in the vertical direction so as to be in the vertical state. As shown in Figs. 1, 3 and 4, one of the pair of vertical rolls 5a and 5b is provided on the main surface of one of the vertical rolls 5a shown on the left side of the figure, 3a, the engraved portion C engraved in the shape of the roll mark is formed in order to add and mark the target roll mark. 3, the hatching of the pair of horizontal rolls 4a and 4b and the pair of vertical rolls 5a and 5b is omitted for the sake of explanation.

A part of the material of the flange portion of the steel material 1 enters into the groove of the engraved portion C at the time of finish rolling so that a portion of the flange portion corresponding to the position of the engraved portion C is formed on the outer surface of the flange corresponding to the position of the engraved portion C, Depending on the shape, an embossed portion that protrudes outward from the outer side surface is formed. 1, on the outer surface side of one of the flanges 3a of the steel material 1, "J" and "J" are provided on the leading end side of the region of the exit side (right lower side in FIG. 1) of the finishing mill 10 of the steel material 1 A first embossing portion 1a in which a series of three alphabetic characters "F" and "E" are embossed and a first embossing portion 1a which is spaced apart from the first embossing portion 1a, And the second embossed portion 1b embossed on the side of the finish rolling mill 10 is formed by the finish rolling mill 10.

As shown in Figs. 3 and 4, grooves constituting the engraved portions C are formed at a set depth hw from the main surface of the pair of vertical rolls 5a. The depth of the engraved portion C is set within a range of 500 탆 or more, preferably 1000 탆 or more. When the depth is less than 500 mu m, the embossed portion becomes unclear and there is a high possibility that it can not be used as a roll mark.

3, the central position of the engraved portion C in the vertical direction is formed to coincide with the central position of the pair of vertical rolls 5a and 5b on the main surface of one of the vertical rolls 5a have. By doing so, the vertical center position of the engraved portion C is matched with the center position of the web 2 in the thickness direction. The height hc of the engraved portion C in the vertical direction is formed to have a length equal to or greater than the thickness h2 of the web 2 so as to overlap the thickness h2 of the web 2 of the steel material 1 . The height hc of the engraved portion C is preferably set within a range of 2.6 times or less the thickness h2 of the web 2. [ Therefore, for example, when the thickness h2 of the web 2 is about 13 mm, the height hc of the engraved portion C is preferably set to a value up to about 34 mm.

The raised portions 1a and 1b may be formed on the outer surface of the other flange 3b of the steel material 1 or may be formed on both the flanges 3a and 3b. In the case where the embossed portions 1a and 1b are formed on the outer surface of the other flange 3b of the steel material 1, the configuration equivalent to the engraved portion C shown in the figure is formed on the other vertical roll 5b, And the steel material 1 may be rolled.

4 is a view showing the relationship between the vertical position D L of the flange 3a of the steel material 1 before the finish rolling and the center position D R of the other flange 3b, And shows a state in which the steel material 1 is sectioned in a plane parallel to the traveling direction and horizontally arranged. In the present specification, the "height of the web 2" of the steel material 1 will be described as "the length between the upper and lower central portions of the outer side surfaces of the pair of flanges 3a, 3b". The height w1 of the web 2 of the steel material 1 before it is fed into the finishing mill 10 is equal to the height w1 of the central portions D L and D R of the pair of flanges 3a and 3b of the steel material 1 ). In the steel material 1 shown in Figs. 1 to 8, the " height of the web 2 " is the minimum length between the outer surfaces of the pair of flanges 3a and 3b.

As shown in Fig. 4, the pair of vertical rolls 5a and 5b are arranged such that the interval between the pair of vertical rolls 5a and 5b, which form the height w2 of the web 2 after the finish rolling, Is shorter than the height (w1) of the web (2) of the steel material (1). The pair of vertical rolls 5a and 5b are formed by pressing down the height of the web 2 at one side (left side in the figure) of the steel material 1 by a constant reduction amount? W L , The height of the web 2 at the other side (right side in the drawing) is reduced by the same amount of reduction? W R as in the one side. The total height of the web 2 of the steel material 1 is reduced by the sum of the sum of the downward pressing amount on one side and the downward pressing amount on the other side (Δw L + Δw R ) w2 is reduced from the height w1 of the web 2 before finish rolling to a predetermined reduction amount w1-w2. Wherein w1-w2 = Δw is the L + R Δw. If the set rolling reduction amount (w1-w2) is at least 4.5 mm or more, the engraved roll mark can be clearly identified. When the set down amount is less than 4.5 mm, there is a high possibility that the roll mark to be imprinted becomes unclear.

A pair of vertical rolls 5a and 5b are fixed to the pair of flanges 3a and 3b of the steel material 1 by the steel material 1 when the steel material 1 is rolled by the finishing mill 10, The flange is brought into contact with the outer surface of the flange in such a manner that the main surface having a vertical section is press-fitted in from the outside to the inside. Therefore, as shown in the sectional view of Fig. 5 (b), a load is applied from the outside to the inside of the flange of the steel material 1 from the pair of the vertical rolls 5a and 5b. The side surfaces of the pair of horizontal rolls 4a and 4b (i.e., the vertically arranged side surfaces parallel to the main surfaces of the pair of vertical rolls 5a and 5b) are covered by the vertical rolls 5a and 5b from the outside to the inside So as to support the inner side surfaces of the flanges 3a and 3b of the steel material 1 press-fitted into the flange 3a.

The steel material 1 is pressed down in a state in which the pair of flanges 3a and 3b are sandwiched between the pair of the vertical rolls 5a and 5b and the pair of horizontal rolls 4a and 4b, (2) is reduced. Then, the pair of flanges 3a, 3b rise from the inclined state at a certain angle? 1 toward the inside, and become a substantially vertical state as shown in the sectional view of FIG. 5 (c).

In Fig. 5 (b), the arrows shown in three stages in the vertical direction schematically show the vectors of the loads applied from the outside to the pair of flanges 3a and 3b. At this time, of the loads applied from the outside to the pair of flanges 3a and 3b, the load applied to both ends of the flange in the vertical direction, indicated by two small arrows at the upper and lower ends in Fig. 5 (b) 1) is used exclusively as a force for standing up the flange of the apparatus.

On the other hand, the load applied to the center in the up-and-down direction of the flange as shown by one large arrow in FIG. 5 (b) is smaller than the load applied to the upper and lower flanges, 3a can be mainly used as a force for forming the embossed portions 1a, 1b in the region corresponding to the thickness of the web 2 on the outer side surface of the webs 3a, 3a.

This will be described in detail.

Fig. 6 shows the positional relationship between the steel material 1 before and after finishing rolling and the horizontal rolls 4a and 4b in finishing rolling. Before the finish rolling, the width of the steel material 1 in the width of the web 1 is wider than the width of the horizontal rolls 4a and 4b, and the width of the web 2 is reduced by the finish rolling.

The load applied to the center reduces the width of the web 2, thereby reducing the web height. In order to reduce the web height, the rolling reaction force acting on the engraved portion at the center in the height direction of the vertical roll increases and the surface pressure to the engraved portion of the vertical roll increases. As the surface pressure increases, it becomes a favorable condition for forming a clear roll mark.

The area between the positions of the inner side faces of the flanges 3a and 3b and the contact positions of the horizontal rolls 4a and 4b is the vicinity of the attachment portion of the flanges 3a and 3b of the left web 2 in Fig. And the regions W and W at both ends of the web 2 are further pressed down by the width of the web 2 due to the reduction of the width of the web 2. This causes the material of the portions W and W to flow in the flange direction So-called " metal flow " occurs. A suitable range he in the flange height direction, in which this metal flow can be used in particular, is centered at the same height position as the center in the thickness direction of the web 2 and has a length approximately 2.6 times the web thickness in the flange height direction (Region) having the above. This metal flow effect also increases with the reduction of the web height, so that a clear high roll mark can be obtained.

Further, in finish rolling, it is possible to positively apply the thickness reduction of the flange, thereby making the roll mark more clear. Fig. 8 is a diagram showing the positional relationship between the steel material 1 and the vertical rolls 5a and 5b when the reduction in the thickness of the flange is applied, in addition to the reduction in the web height due to the reduction of the web inner width. As the thickness of the flange is reduced, there is an effect of raising (raising) the rolling surface pressure and promoting the metal flow of the material, and the material tends to flow into the engraved portion C of the vertical rolls 5a and 5b, The more favorable the condition becomes.

5 (c), the pair of flanges 3a and 3b of the steel material 1 after having passed through the finishing mill 10 stand at an angle that allows them to be regarded as substantially vertical. At this time, the value of the inclination angle? 1 before finishing rolling is, for example, in the range of about 2 ° 25 '?? 1? 5 ° 00'. Further, the angle considered to be substantially vertical after the finish rolling may include an angle in the range of, for example, about 0 ° 15 'to 0 ° 05'. Further, the thickness (h2) of the web after the finish rolling can be also rolled so as to be the set finish thickness. The thickness h2 of the web after finish rolling shown in Fig. 5 (c) is substantially the same as the thickness h1 before the finish rolling, but here, the width of the web Is prevented from increasing in thickness by being sandwiched between the upper and lower horizontal rolls to have a thickness substantially equal to that before the finish rolling. The present invention is not limited to this example, and the thickness of the web may be lowered by the finish rolling.

The height hc of the engraved portion C in the up-and-down direction is 34 mm (2.6 times the thickness of the web) with respect to the H-shaped steel having the web thickness of 13 mm according to the embodiment of the present invention, Quot; J " and " J ", as shown in Fig. 7 (a), are formed on the outer surface of one flange 3a of the obtained H- The embossed portion 1a formed of a series of three alphabetic characters of "F" and "E" was formed so as to be clearly distinguishable as a roll mark. It was also confirmed that, even for the H-shaped steel sheet of the other web thickness, if the height hc of the engraved portion C in the up and down direction is 2.6 times the web thickness, it is possible to provide a clear roll mark.

On the other hand, with respect to the above-mentioned example, in the case of performing the finish rolling by setting the total reduction amount (w1-w2) to 1 mm as a method of manufacturing the H-shaped steel with roll marks, On the outer side surface, embossing portions of the letters "J", "F" and "E", of which three characters in the upper and lower ends were identifiable, were clearly formed. That is, the regions of both ends in the up-and-down direction have a very low height of the embossed portion, and the embossed portion can barely be used as a roll mark.

As a method for producing an H-shaped steel sheet with a roll mark according to a comparative example, finish rolling was performed on the steel material 1 without reducing the height of the web 2. In this case, as shown in Fig. 7 (b), of the three letters "J", "F" and "E" in the one flange 3a of the steel material 1 after the finish rolling, It was impossible to form the embossed portion 11a only to the extent that only the central region at the height could be easily identified. The regions of both ends in the up-and-down direction were hardly embossed, and in a scratched state, the embossed portions 11a could not be used as roll marks.

As shown in Fig. 8, the method for producing an H-shaped steel sheet with a roll mark according to the embodiment of the present invention is characterized in that the height hc of the engraved portion C in the vertical direction is 34 (W1-w2) of 4.5 mm and the flange thickness reduction amount (T1-T2) of 1.5 mm as a reduction amount of the web height due to reduction of the inner width, As shown in Fig. 7 (a), on the outer surface of one of the flanges 3a of the obtained H-shaped steel, there are formed embossed portions 1a (1a) consisting of a series of three letters of "J", "F" ) Was formed so as to be more clearly distinguishable as a roll mark. It was also confirmed that, even for the H-shaped steel sheet of the other web thickness, if the height hc of the engraved portion C in the up and down direction is 2.6 times the web thickness, it is possible to provide a clear roll mark.

According to the method for producing an H-shaped steel sheet with a roll mark according to the embodiment of the present invention, in the method for manufacturing an H-shaped steel sheet with a roll mark in finish rolling, the engraved portion C having a shape corresponding to the target roll mark One vertical roll 5a formed at the center height in the vertical direction of the main surface and the other vertical roll 5b paired with the one vertical roll 5a are arranged at predetermined intervals, The height of the web 2 is reduced by reducing the inner width of the web 2 of the steel material 1 by passing the steel material 1 through the pair of vertical rolls 5a and 5b through the steel material 1 which is an H- The engraved portion C is brought into contact with the outer surface of one flange 3a of the steel material 1 and a plurality of embossed portions 1a and 1b forming roll marks on the outer surface of one flange 3a ). As described above, by utilizing the metal flow of the portions W and W at both ends of the web 2, the engraved portion C is brought into contact with the steel material 1 while reducing the height of the web 2, , A clear roll mark can be added to the H-shaped steel which is the final product.

Although the present invention has been described with reference to the embodiments described above, it should be understood that the description and the drawings constituting part of this disclosure do not limit the present invention. For example, the pair of horizontal rolls 4a and 4b of the finishing mill 10 may be of a fixed type rather than a detachable width variable type. It is needless to say that a section of a so-called I-section steel can also be included as the H-section steel of the present invention.

From this disclosure, it should be understood that various alternative forms of embodiment, examples and operating techniques will become apparent to those skilled in the art. The present invention includes various embodiments not described in the present specification and drawings, and the technical scope of the present invention is determined only by the inventive matters according to the scope of the relevant patent claims from the above description .

1: Steel (H-beam)
1a: Embossed part (roll mark)
2: web
3a, 3b: flange
4a, 4b: horizontal roll
5a, 5b: vertical roll
10: Finishing mill
w1: height of web (before finish rolling)
w2: height of web (after finishing rolling)
hc: Height of the engraved part
hw: Depth of engraving
h1: thickness of web (before finish rolling)
h2: thickness of web (after finish rolling)
he: Web Flow of Metal Flow
C:
T1: Thickness of the flange (before finish rolling)
T2: Thickness of the flange (after finishing rolling)

Claims (7)

One of the vertical rolls formed at the center height of the vertical direction of the peripheral surface of the engraved portion of the shape corresponding to the target roll mark and the other vertical roll paired with the one vertical roll at a predetermined interval Respectively,
Wherein a height of the engraved portion is superimposed on the thickness of the web of the steel material when the steel material to be the H-shaped steel product is passed between the pair of vertical rolls arranged so as to be rolled down, Wherein a horizontal roll having a width interval is disposed to reduce the width of the web of the steel material to reduce the height of the web and to bring the engraved portion into contact with the outer surface of the flange of the steel material, And forming the roll mark on the outer side surface of the flange while flowing the material of the portion to the side of the flange contacting the one vertical roll formed with the engraved portion. The method according to claim 1,
Wherein the step of raising the flange from the inclined state is carried out simultaneously with the step of forming the roll mark. 3. The method according to claim 1 or 2,
And the thickness of the flange is reduced at the same time as the processing for reducing the height of the web. delete The method according to claim 1,
And the height of the engraved portion is 2.6 times or less the thickness of the web. 3. The method according to claim 1 or 2,
And reducing the height of the web by 4.5 mm or more. 3. The method according to claim 1 or 2,
Wherein the depth of the engraved portion is 500 mu m or more.
KR1020160008586A 2015-01-27 2016-01-25 Production method of h-shaped steel with a roll mark KR101840690B1 (en)

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JP2015013233 2015-01-27
JPJP-P-2015-251264 2015-12-24
JP2015251264A JP6206480B2 (en) 2015-01-27 2015-12-24 Method for manufacturing H-shaped steel with roll mark

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JP2000051902A (en) * 1998-08-14 2000-02-22 Kawasaki Steel Corp H-section with roll mark and manufacture thereof
JP2003285102A (en) * 2002-03-27 2003-10-07 Jfe Steel Kk Method for transferring identification mark on h-shape steel

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JP2908456B2 (en) * 1988-06-27 1999-06-21 川崎製鉄株式会社 Rolling method for section steel
JPH0780503A (en) * 1993-09-10 1995-03-28 Nippon Steel Corp Rolling method for shape having flange

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JP2000051902A (en) * 1998-08-14 2000-02-22 Kawasaki Steel Corp H-section with roll mark and manufacture thereof
JP2003285102A (en) * 2002-03-27 2003-10-07 Jfe Steel Kk Method for transferring identification mark on h-shape steel

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