EP0559539A1 - Verfahren zum Herstellen von H-Stahlprofilen - Google Patents

Verfahren zum Herstellen von H-Stahlprofilen Download PDF

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Publication number
EP0559539A1
EP0559539A1 EP19930400514 EP93400514A EP0559539A1 EP 0559539 A1 EP0559539 A1 EP 0559539A1 EP 19930400514 EP19930400514 EP 19930400514 EP 93400514 A EP93400514 A EP 93400514A EP 0559539 A1 EP0559539 A1 EP 0559539A1
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EP
European Patent Office
Prior art keywords
rolling
mill
web
universal
width
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Ceased
Application number
EP19930400514
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English (en)
French (fr)
Inventor
Hiroshi 404 Daiichi-Takamagahara-Shataku Shikano
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Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Publication of EP0559539A1 publication Critical patent/EP0559539A1/de
Ceased legal-status Critical Current

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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
    • B21B1/0886—H- or I-sections using variable-width rolls

Definitions

  • the present invention relates to a process for manufacturing H-shaped steels, such as H-shaped beams and H-shaped piles, for use in civil engineering and the construction industry, and in particular to a process for manufacturing, through hot rolling, H-shaped steels having various sizes of high quality in the same rolling chance using the same rolls without changing the rolls, resulting in a high efficiency and high yield of H-shaped steels with a marked reduction in the number of rolls to be retained.
  • a conventional rolling mill line for producing H-shaped beams and channels comprises, as shown in Figure 4a, three different types of mills: a breakdown mill (hereunder referred to as a "BD-mill") 10, a universal roughing mill (hereunder referred to as a "UR-mill”) 11, an edging mill (hereunder referred to as an "E-mill”) 12, and a universal finishing mill (hereunder referred to as a "UF-mill”) 13.
  • the BD-mill, UR-mill + E-mill, and UF-mill are arranged in a tandem line in this order.
  • a rolling material such as slabs, rectangular steel pieces, and blank beams, is rough rolled with the breakdown mill 10 to give a predetermined rough shape, then through intermediate reverse rolling with the universal roughing mill 11 and edging mill 12 a rolling workpiece having the rough shape is further rolled to give a predetermined final shape and is finished with a universal finishing mill 13 to obtain a final product.
  • Figure 5a shows a rolling process in which a web 2 of the H-shaped steel is rolled with a pair of horizontal rolls 20 of the UR-mill 11 while flanges 1a, 1b are supported with a pair of tapered vertical rolls 21.
  • the top and bottom ends of flanges 1a, 1b are reduced in height with a pair of edging rolls 22 of the E-mill 12.
  • Rolling with the UR-mills 11 and the E-mill 12 is repeated.
  • the flanges 1a, 1b are made upright by the action of horizontal rolls 23 and vertical rolls 24.
  • Japanese Patent Publication No.50-21984/1975 discloses a method for rolling H-shaped steels using a mill arrangement in which an edging mill is placed between two universal roughing mills, and these three mills are arranged in a tandem line.
  • a rolling work piece after breakdown rolling is subjected to reverse rolling by the two universal roughing mills and the edging mill before being finished with the finishing universal mill.
  • Figure 4d shows still another example in which the rolling mill arrangement comprises a series of rolling mill groups in a tandem line, each group comprising an edging mill between two universal rolling mills.
  • a rolling work piece is, in a single pass, rolled through intermediate rolling and finishing rolling to provide a final product.
  • the size of rolls for the universal finishing mill as well as for preceding mills is determined by the size of final products.
  • the widths a1 in Figure 6a and a2 in Figure 7a, and a3 in Figure 7b and a4 in Figure 7c are designed to be substantially the same.
  • horizontal rolls of rolling mills after a breakdown rolling mill must have specific widths, and the horizontal rolls must be changed depending on the size of final products.
  • This means that horizontal rolls having specific widths must be used for rolling a specific series of H-shaped steels (e.g., H600X300), resulting in a fixed dimension of inner web length with a varied dimension of web height.
  • H-shaped steels e.g., H600X300
  • the difference in flange thickness between the maximum and minimum is about 15 mm, and the web height will vary in a range of about 30 mm. It is therefore inevitable that the web height will vary even within the same series of rolled steel member. This is a serious defect when H-steels are used in the construction of buildings.
  • an H-shaped beam has a web having a fixed width and a varying web height. This will cause a serious problem when precise dimensions are required in a limited space.
  • H-shaped steels are sometimes not accurate. Namely, in a conventional rolling process, as shown in Figure 8, the vertical surfaces of horizontal rolls 82 of a universal roughing mill 80 are worn out after a substantial number of work pieces are rolled, resulting in a decrease in the width of the horizontal rolls 82. Although the vertical surfaces of vertical rolls 84 are also worn out, in order to compensate for wear of the vertical rolls, it is only necessary to adjust the position of each of the vertical rolls, i.e., to adjust the distance between the opposing vertical rolls.
  • the web height is decreased by an amount corresponding to the amount of wear of the vertical surfaces of the horizontal rolls, provided that the thickness of flange is not varied. See Figure 9.
  • the thickness of flange is adjusted to be as thick as possible within dimensional tolerances.
  • setting the flange thickness in this manner has the following disadvantages.
  • dimensional tolerances for the web height are ⁇ 3.0 mm for a web height of less than 400 mm, ⁇ 4.0 mm for a web height of 400 - 600 mm, and ⁇ 5.0 mm for a web height of 600 mm or larger. Since the web height is influenced by the width of the horizontal rolls, the horizontal rolls to be used must be chosen within the dimensional tolerances taking into consideration a target web height. This means that the thickness of the flange is determined by the width of the horizontal roll. Thus, when horizontal rolls which are worn out on the vertical surfaces are employed, the thickness of the resulting H-shaped steels is thickened. In this case, since the length extended by rolling is decreased, the yield rate of rolling is decreased, too.
  • H-shaped beams produced by hot rolling have such disadvantages, sometimes H-shaped steels for use in constructing buildings are produced by welding steel plates having predetermined thicknesses to give a predetermined constant web height.
  • an increase in manufacturing costs is inevitable.
  • reverse rolling is carried out between at least one universal mill, the horizontal rolls of which have recesses at their edges, and at least one universal mill, the horizontal rolls of which are flat or convex at their edges.
  • Rough rolling is finished to form swelled portions having a predetermined height at both edges of the web.
  • the swelled portions are rolled with a rolling mill the horizontal rolls of which have flat surfaces or convex surfaces at both edges, just before finishing rolling, to provide an expansion of the inner web length.
  • the finish rolling is then carried out using width-variable horizontal rolls.
  • the expansion of the inner web length i.e., web width is carried out with a single pass through a universal mill just before going into a finishing mill, the maximum expansion of the web width is around 30 mm, and it is rather difficult to expand the web width more than this without resulting in waviness on the web surfaces.
  • the temperature of the web is decreased to a relatively low temperature during the reverse rolling because of the cooling effect of rolls and cooling water.
  • Japanese Unexamined Laid-Open Specification No.63-260602/1988 discloses a method of expanding the web width little by little by carrying out reverse rolling using just a pair of horizontal rolls each divided into two pieces which are movable along an axial direction.
  • this method is not intended to expand the web width significantly, but merely to flatten an excess metal portion formed in a transitional area between a flange and web.
  • an expansion of the web height (web width) per pass is small, and an increased number of passes must be performed when a relatively large degree of expansion (about 30 mm, for example) is required, resulting in a degradation in rolling efficiency.
  • Japanese Unexamined Laid-Open Specification No.2-6001/1990 discloses a rolling method for shaped steels in which a rolling process through a breakdown mill and universal roughing mill is the same as in the conventional process, but a universal finishing mill employs variable-width horizontal rolls.
  • a rolling process through a breakdown mill and universal roughing mill is the same as in the conventional process, but a universal finishing mill employs variable-width horizontal rolls.
  • buckling is inevitable, resulting in a deviation of the position of a web from the center line of the flange, i.e., web off-center.
  • the buckling remains in the web in a central area corresponding to a space between the divided pieces of the horizontal rolls, and these products cannot be put on the market.
  • a maximum reducible width is about 30 mm in this method, and it is impossible to produce a variety of H-shaped steels having various sizes of web height in the same rolling chance without changing rolls.
  • variable-width horizontal rolls are installed in each of a universal roughing mill (UR), edging mill (E), and universal finishing mill (UF).
  • UR universal roughing mill
  • E edging mill
  • UF universal finishing mill
  • a web 101 is partially rolled and edges of flanges 102 are rolled, making it possible to roll H-shaped steels having varied web heights using the same rolls.
  • the width of each of the horizontal divided rolls 103, 104, and 105 is previously adjusted to a predetermined one and is not adjusted for each pass. Thus, it is necessary to previously determine the width of each of the horizontal rolls depending on the dimensions of a workpiece after breakdown rolling.
  • Japanese Unexamined Laid-Open Specification No.60-82201/1985 disclosed a method of rolling H-shaped steels having different web heights and flange widths without changing rolls, in which, as shown in Figure 11, variable-width horizontal rolls are installed in each of a first universal roughing mill (UR1), an edging mill (E), a second universal roughing mill (UR2), and a universal finishing mill (UF).
  • UR1 first universal roughing mill
  • E edging mill
  • UR2 second universal roughing mill
  • UF universal finishing mill
  • a web 101 is partially rolled and edges of flanges 102 are rolled, making it possible to roll H-shaped steels having varied web heights using the same rolls.
  • the width of each of the divided horizontal rolls is previously adjusted to a predetermined value and is not adjusted for each pass.
  • Japanese Unexamined Laid-Open Specification No.61-283401/1986 discloses, as shown in Figure 12, a method of rolling a shaped steel using a mill arrangement in which each of the horizontal rolls of a universal roughing mill (UR1) is divided into two pieces to have a variable-width in a roll axis direction.
  • a web 101 of the shaped steel is partially rolled with UR1, and then only flanges 102 are rolled with an edging mill (E), which has also divided horizontal rolls.
  • E edging mill
  • a non-rolled portion on the web 101 is rolled with the horizontal rolls of UR2.
  • each of the divided horizontal rolls is adjusted to a predetermined length previously, but is not varied for each pass during rolling with each of the mills.
  • the width of each of the roll mills will be determined based on the dimensions of a workpiece after breakdown rolling. Thus, the web width is not expanded or reduced during rolling after breakdown rolling. In order to produce H-shaped steels having different web heights without changing rolls, it is, therefore, necessary to change grooved rolls of the breakdown mill. There is no disclosure in that publication about how to manufacture H-shaped steels having any desired web height.
  • An object of the present invention is to provide a process for manufacturing, through hot rolling, high quality H-shaped steels having various sizes in the same rolling chance using the same rolls without changing the size of the rolls.
  • Another object of the present invention is to provide a process for manufacturing, through hot rolling, H-shaped steels with which highly efficient rolling can be achieved with a high yield and with which the inventory of rolls can also be reduced markedly.
  • the present invention is a process for manufacturing H-shaped steels through intermediate hot rolling and finishing hot rolling, in which a horizontal roll employed is divided into two or more pieces in a roll axis direction, the width is adjustable for each pass, the intermediate rolling comprising a first step of forming one or more non-rolled portions on the surface of the web while carrying out reduction in web thickness as well as reduction in the thickness of flanges; a second step of flattening the web surface to expand the inner web width while not only reduction in thickness of the flange but also reduction in thickness of the web are carried out with the other universal mill or with a universal mill on the downstream side; alternatively a first step of flattening the web surface while performing reduction in flange thickness with one of the first and second universal mills; a second step of forming one or more non-rolled portions on the web surface to reduce the inner web width while not only reduction in thickness of the flange but also reduction in thickness of the web are carried out with the other universal mill or with a universal mill on the downstream side; and repeating the first and
  • Figures 1a - 1c are schematic sectional views illustrating how to expand the inner web width in accordance with the present invention.
  • Figures 2a - 2c are schematic sectional views illustrating how to reduce the inner web width in accordance with the present invention.
  • Figures 3a and 3b are schematic sectional views illustrating another example of how to reduce the inner web width in accordance with the present invention and that of the prior art, respectively.
  • Figures 4a - 4d are illustrations of rolling mill arrangements with which hot rolling of H-shaped steels of the prior art as well as of the present invention can be performed.
  • Figures 5a - 5c are schematic views illustrating a process of hot rolling in accordance with the prior art.
  • Figures 6a and 6b are schematic sectional views of a grooved roll of a breakdown mill.
  • Figures 7a - 7c are schematic views illustrating a process of hot rolling in accordance with another example of the prior art.
  • Figure 8 is a schematic view illustrating wear of the lateral surfaces of horizontal rolls of a conventional universal mill.
  • Figure 9 is a schematic illustration showing names of elements of an H-shaped steel.
  • Figure 10 is a schematic view illustrating a change in section of a workpiece when the web height is adjusted in accordance with the prior art.
  • Figure 11 is a schematic view illustrating a change in section of a workpiece when the web height is adjusted in accordance with another example of the prior art.
  • Figure 12 is a schematic view illustrating a change in section of a workpiece when the web height is adjusted in accordance with still another example of the prior art.
  • Figure 13 is a schematic view illustrating a change in section of a workpiece in each of the rolling steps when the web height is adjusted in accordance with the process of Example 1 of the present invention.
  • Figure 14 is a schematic view illustrating a change in section of a workpiece in each of the rolling steps when the web height is adjusted in accordance with the process of Example 2 of the present invention.
  • Figure 15 is a schematic view illustrating a change in section of a workpiece in each of the rolling steps when the web height is adjusted in accordance with the process of Example 3 of the present invention.
  • the first and second universal mill had horizontal rolls which were each divided into two or three pieces, and the edging mill also had horizontal rolls which were each divided into two pieces.
  • the width of each of the horizontal rolls could be adjusted while the mill is on line, i.e., after or before each pass, in the roll axis direction in accordance with the inner web width of a workpiece to be rolled.
  • FIGs 4b, 4c and 4d are schematic illustrations of roll mill arrangements for producing H-shaped steels. The present invention will be further described with respect to the roll mill arrangement shown in Figure 4b.
  • the roll mills employed in this embodiment are schematically shown in Figure 11, in which horizontal rolls divided into two or three pieces are installed in the first universal roughing mill (UR1), edging mill (e), the second universal roughing mill (UR2), and universal finishing mill (UF).
  • the widths of these horizontal rolls can be varied in the axial directions of the rolls for each pass.
  • Breakdown rolling is carried out in a conventional manner to provide a beam blank, i.e., a rough-rolled workpiece.
  • the beam blank is then subjected to an intermediate rolling step in which reverse rolling is carried out using the universal roughing mills and edging mill arranged in a pattern UR1-E-UR2.
  • the rolling workpiece is rolled to give finished sizes for flange width, inner web width, flange thickness, and web thickness.
  • the intermediate rolling before the intermediate rolling, it is determined whether the web width is to be expanded or reduced or maintained, and then rolling with each of the mills is continued in accordance with a predetermined rolling schedule depending on whether the web height should be expanded, or reduced, or maintained.
  • one or more non-rolled portions 2a are formed on the surface of the web.
  • not only reduction in thickness of the flange as well as reduction in thickness of the web are carried out to flatten the web surface.
  • expansion of the web width i.e., Wa1 ⁇ Wa2 or Wb1 ⁇ Wb2, is carried out. This process of forming the non-rolled portion and of expanding the width is repeated until a predetermined amount of expansion is obtained.
  • the flattening of the web surface as well as the reduction in the thickness of flanges with one of the universal mills are carried out.
  • reduction in thickness of the flange as well as reduction in thickness of the web are carried out, and one or more non-rolled portions 2a are formed on the surface of the web.
  • reduction in the inner web width i.e., Wa1 > Wa2 or Wb1 > Wb2, is carried out. This process of flattening the web surface and forming the non-rolled portion as well as reducing the web width is repeated until a predetermined amount of reduction is obtained.
  • the roll widths of the horizontal rolls of the first and second universal roughing mills are adjusted to be the same, and only the reduction in the thickness of the flanges and web is carried out, and expansion or reduction of the inner web width is not carried out.
  • rolling for expansion and reduction of the inner web width may be carried out repeatedly one after another.
  • the horizontal rolls employed in the first and second universal roughing mills have the configurations shown in Figure 11.
  • the horizontal rolls may also have the configurations shown in Figure 12.
  • the process of expanding or reducing the inner web width is the same as shown in Figures 1c and 2c.
  • An edging mill may also have variable-width edging rolls, and the width can be adjusted in conformity with that of the horizontal rolls of a universal mill in the preceding rolling step after each of the passes through the preceding mill.
  • a workpiece is subjected to final finishing rolling in which the flange angle and thickness of the flanges and web are finished with the universal mill to provide a final product.
  • an intermediate rolling and finishing rolling are carried out using a rolling mill arrangement as shown in Figure 4c, in which the horizontal rolls of the universal roughing mill, edging mill, and universal finishing mill are divided in the axial direction, and the width thereof is adjustable before or after each pass. Since the taper angle of the horizontal rolls of the second universal mill is adjusted to be substantially zero, the universal mill serves as a finishing mill.
  • expansion or reduction in the inner web height can be achieved in the same manner as when using the before-mentioned rolling mill arrangement UR1-E-UR2.
  • the flange angle is corrected and the thickness of the flanges and web is adjusted slightly to meet specifications and obtain a final product.
  • an intermediate rolling and finishing rolling are carried out using a rolling mill arrangement as shown in Figure 4d, in which the horizontal rolls of the universal roughing mills, and edging mills are divided in the axial direction, and the width thereof is adjustable after each pass in an on-line basis.
  • three rolling mill groups U1-E1-U2, U3-E2-U4, and U5-E3-U6, each having three mills, can correspond to the before-described UR1, E, and UR2, respectively, of the rolling mill arrangement UR1-E-UR2.
  • the mill structure of each of the mills is like that shown in Figure 11 or 12.
  • a rolling process such as shown in Figure 1 or 2 may be performed so as to effect expansion or reduction of the inner web width.
  • the flange angle is corrected and the thickness of flanges and web is adjusted slightly to meet specifications and obtain a final product.
  • another rolling line other than that shown in Figure 4d may be employed. Namely, a plurality of groups of rolling mills, each including a universal mill and edging mill, arranged in a tandem line may be used for this purpose.
  • An example of the horizontal roll employed in the present invention which can be divided in an axial direction, and the inner width of which can be adjusted on line after each pass, may be found in Japanese Unexamined Laid-Open Specification No.60-72603/1985.
  • the shape of the horizontal roll or the number of pieces into which it is divided are not limited to specific ones as long as the purpose of the present invention can be achieved.
  • H-shaped steels H600X300, H700X300, H800X300, and H900X300 were manufactured in accordance with the first embodiment of the present invention without changing any of rolls including those of a breakdown mill.
  • the roll mill arrangement employed is that shown in Figure 4b in which the first universal mill (UR1 mill), the edging mill (E mill), the second universal mill (UR2 mill), and the universal finishing mill (UF mill) have the shapes and dimensions shown in Figure 13.
  • the grooved rolls of the breakdown mill are those for use in manufacturing the H700X300 series.
  • the inner web width was kept constant without expansion or reduction throughout the rolling process after breakdown rolling.
  • Table 1 indicates the inner web width set for each of the horizontal rolls after each pass and the expansion or reduction amounts achieved by each pass of a rolling mill.
  • the web surface was flattened by each pass through the UR1 mill, and reduction was performed by odd numbered passes through the UR2 mill.
  • the resulting H-shaped steels having a series of sizes from H600X300 to H900X300 were free of surface defects such as rolling flaws and scratches, and the dimensions were accurate since the width each of the horizontal rolls was adjusted on line before each pass in accordance with the finished dimensions or wear of the rolls.
  • the rolling yield was also excellent.
  • H700X300, H800X300, and H900X300 Three series of H-shaped steels (H700X300, H800X300, and H900X300) were manufactured in accordance with the second embodiment of the present invention without changing any of the rolls including those of a breakdown mill.
  • the roll mill arrangement employed was that shown in Figure 4c in which the universal mill (UR mill), the edging mill (E mill), and the universal finishing mill (UF mill) had the shapes and dimensions shown in Figure 14.
  • the grooved rolls of the breakdown mill were those for use in manufacturing the H800X300 series.
  • the inner web width was kept constant without effecting expansion or reduction throughout the rolling process after breakdown rolling.
  • Table 2 indicates the inner web width set for each of the horizontal rolls after each pass, and expansion or reduction amounts achieved by each pass of a rolling mill.
  • the web surface was flattened by each pass through the UR mill, and reduction was performed by odd numbered passes through the UF mill.
  • the thickness of the flanges and web was slightly adjusted in the 7th final pass through the UF mill and the flange was made upright so as to meet specifications for final products.
  • the resulting H-shaped steels having a series of sizes from H700X300 to H900X300 were free of surface defects such as rolling flaws and scratches, and the dimensions were accurate since the width of the horizontal rolls was adjusted on line before each pass based on the finished dimensions or wear of the rolls.
  • the rolling yield was also excellent.
  • H-shaped steels of H300X300, H400X200, and H450X200 were manufactured in accordance with the third embodiment of the present invention without changing any of the rolls including those of a breakdown mill.
  • the roll mill arrangement employed was that shown in Figure 4d in which the universal mills (U1 - U7 mills), and the edging mills (E1 - E4 mills) had the shapes and dimensions shown in Figure 15.
  • the grooved rolls of the breakdown mill were those for use in manufacturing the H400X200 series.
  • the inner web width was kept constant without effecting expansion or reduction throughout the rolling process after breakdown rolling.
  • Table 3 indicates the inner web width set for each of the horizontal rolls after each pass and expansion or reduction amounts achieved by each pass of a rolling mill.
  • the web surface was flattened by each pass through the U1, U3, and U5 mills, and the reduction thereof was performed by each pass through the U2, U4, and U6 mills.
  • one or more non-rolled portions were formed on the web surface by each pass through the U1, U3, and U5 mills, and expansion of the inner web width was performed by each pass through the U2, U4, and U6 mills.
  • the resulting H-shaped steels having a series of sizes from H300X300 to H450X200 were free of surface defects such as rolling flaws and scratches, and the dimensions were accurate since the width each of the horizontal rolls was adjusted on line before each pass based on the finished dimensions or wear of the rolls.
  • the rolling yield was also excellent.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP19930400514 1992-03-02 1993-03-01 Verfahren zum Herstellen von H-Stahlprofilen Ceased EP0559539A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4493492A JP3211331B2 (ja) 1992-03-02 1992-03-02 Ｈ形鋼の熱間圧延方法
JP44934/92 1992-03-02

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EP0559539A1 true EP0559539A1 (de) 1993-09-08

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EP19930400514 Ceased EP0559539A1 (de) 1992-03-02 1993-03-01 Verfahren zum Herstellen von H-Stahlprofilen

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7280504B2 (ja) * 2019-08-14 2023-05-24 日本製鉄株式会社 左右フランジ厚みの異なる非対称ｈ形鋼の製造方法
JP7280503B2 (ja) * 2019-08-14 2023-05-24 日本製鉄株式会社 左右フランジ厚みの異なる非対称ｈ形鋼の製造方法
JP7280505B2 (ja) * 2019-08-14 2023-05-24 日本製鉄株式会社 左右フランジ厚みの異なる非対称ｈ形鋼の製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0348913A2 (de) * 1988-06-27 1990-01-03 Kawasaki Steel Corporation Verfahren zum Walzen von Doppel-T-Stahlprofilen
EP0498733A2 (de) * 1991-02-08 1992-08-12 Sumitomo Metal Industries, Ltd. Verfahren zum Walzen von Stahlprofilen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0348913A2 (de) * 1988-06-27 1990-01-03 Kawasaki Steel Corporation Verfahren zum Walzen von Doppel-T-Stahlprofilen
EP0498733A2 (de) * 1991-02-08 1992-08-12 Sumitomo Metal Industries, Ltd. Verfahren zum Walzen von Stahlprofilen

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 223 (M-411)10 September 1985 & JP-A-60 082 201 ( KAWASAKI SEITETSU ) 10 May 1985 *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 331 (M-533)11 November 1986 & JP-A-61 135 403 ( KAWASAKI STEEL ) 23 June 1986 *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 393 (M-654)23 December 1987 & JP-A-62 161 403 ( KAWASAKI STEEL ) 17 July 1987 *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 55 (M-795)8 February 1989 & JP-A-63 260 602 ( NIPPON STEEL ) 27 October 1988 *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 135 (M-949)14 March 1990 & JP-A-02 006 001 ( KAWASAKI STEEL ) 10 January 1990 *

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JPH05269502A (ja) 1993-10-19
JP3211331B2 (ja) 2001-09-25

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