US2996937A - Rolling of metal stock - Google Patents

Rolling of metal stock Download PDF

Info

Publication number
US2996937A
US2996937A US653487A US65348757A US2996937A US 2996937 A US2996937 A US 2996937A US 653487 A US653487 A US 653487A US 65348757 A US65348757 A US 65348757A US 2996937 A US2996937 A US 2996937A
Authority
US
United States
Prior art keywords
stand
stock
reversing
mill
finishing
Prior art date
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.)
Expired - Lifetime
Application number
US653487A
Inventor
Cramer Hans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US2996937A publication Critical patent/US2996937A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control

Definitions

  • This invention relates to new and useful improvements in the rolling of metal stock.
  • the invention more particularly relates to an improved method and mill set-up for hot rolling metal stock in a strip mill provided with a reversing rougher and a continuously operating finish ing mill having several stands.
  • finishing stands In the hot rolling strip mills having a reversing rougher and a continuously operating finishing mill consisting of several, as for example six, finishing stands, may be used.
  • the stock is rolled back and forth in the reversing rougher mill a multiple number of passes. After the last pass through the reversing rougher, the stock is passed to and through the finishing mill.
  • the stands of which are brought close together, so that the length of the finishing mill is much less than the length of the stock being rolled by the finishing mill.
  • the stand of the reversing rougher has been'positioned a sufficient distance from the first stand of the finishing mill so that the material being rolled passed through and clear of the reversing rougher on its last pass prior to being fed to the first stand of the finishing mill train.
  • the distance between the reversing rougher and the first stand of the finishing train therefore had to be greater than the length of the material being rolled on its longest, i.e., last pass through the reversing rougher. Due to this requirement, the entire mill had to have a large structural length which, in addition to the obvious economic disadvantage, would result in a strong temperature loss and an increase in scaling of the rolled stock.
  • One object of this invention is a method for operating a hot-rolling strip mill and a strip mill construction which overcomes the above mentioned disadvantages.
  • the invention is broadly directed to an improvement for the method of rolling stock in a hot-rolling strip mill having a reversing stand and a finishing train with several stands in which the stock is rolled back and forth in the reversing stand over a number of passes and thereafter passed through the finishing train and to an improvement in the construction of a hot-rolling strip mill of this type.
  • the first stand of the finishing train is maintained at a distance from the reversing stand less than the length of the stock after its last pass through the reversing stand and the stock on its last pass through the reversing stand is fed into the first stand of the finishing train prior to a complete emergence from the reversing stand and the first stand of the finishing train, while synchronizing the speed of the reversing stand.
  • the synchronization of the speeds of the reversing stand and the first stand of the finishing train while the stock is simultaneously being passed therethrough is preferably effected by adjusting the speed of the reversing stand at the end of its last pass as the stock is simultaneously fed into the finishing train to equal the speed of the first stand of the finishing train.
  • the first stand of the finishing train is preferably maintained at a distance from the reversing stand only a little more than the length of the stock after its third from last pass through the reversing stand.
  • the mill in accordance with the invention, as contrasted with the prior art mill, is so constructed that the first stand of the finishing train is positioned to receive the rolled stock directly from the reversing stand on its last pass prior to complete emergence therefrom and means are provided, as for example, means to control the speed of the reversing stand for synchronizing the speed of the reversing stand and the first finishing stand while simultaneously engaging the same piece of rolled stock.
  • the reversing stand and first stand of the finishing train are thus positioned at a distance from each other less than the length of the stock after its final pass and preferably at nearly the distance of the length of the stock after its third from last pass, as for example its fifth pass, when the mill is operated with for instance seven passes in the reversing stand.
  • the drawing is a plan View of a mill for use with the method disclosed.
  • the finishing train preferably is provided with tour stands as contrasted to the conventional SIX.
  • the hot-rolling strip mill has furnaces 1 for heating the slabs to be rolled, a reversing stand 2 provided with the pressure rollers 2 and a finishing train provided with four stands 3, 4, 5 and 6 and a coiler 7.
  • the rollers of the stands are driven in the conventional manner by conventional drive means 2a, 3a, 4a, 5a, 6a respectively.
  • the speeds of the rollers of the stands 3, 4, 5 and 6 of the continuous finishing train are in a known manner matched so that the stock is rolled continuously and simultaneously by said rollers.
  • the speeds of the rollers of the reversing stand 2 are controlled by means of the control box 8 to the speeds of the rollers of the first stand 3 of the finishing train.
  • the stock In operation the stock is moved in a conventional way from one of the furnaces: 1 to the reversing stand 2 and is then passed back and forth through the reversing stand 2 over a multiple number of passes, as for example 7 passes.
  • the distance d between the reversing stand 2 and the first stand 3 of the finishing train is so adjusted to be nearly equal to the length of the stock after its third from last, as for example pass, through the reversing stand 2.
  • the length of the stock is, of course, increased and in the drawing the stock 9 is shown in a position upon reaching the end of the third from last, as for example the fifth pass.
  • the length of this pass is just sufiicient to reach the first stand 3 of the finishing train without being engaged by the rollers of the stand 3.
  • the length of the stock is increased and in the drawings is shown in dotted lines at 9a, and on the final or last pass the length of the stock is still further increased so that the same is approximately equal to 1.4d.
  • the speed of the rollers of the reversing stand 2 synchronize to that of the rollers of the first stand 3 of the finishing train.
  • This synchronization may be effected, for example, by adjusting the speed of the rollers of the reversing stand 2 by means of the control box 8.
  • the speed of the rollers referred to herein is the peripheral speed and not the revolutionary speed.
  • the stock will then pass directly from the reversing stand 2 through the first stand 3 of the finishing train and through the subsequent stands of the finishing train as shown; the finished stock will than in the conventional Way be coiled up to coils by the coiler 7.
  • the invention allows a substantial decrease in the length of the mill as a Whole and conversely an increase in the length of the stock which may be rolled in a mill of a given length. If, for example, in accordance with the rolling program for the reversing stand, a thickness of 18 mm. is to be achieved on the last pass, a thickness of 30 mm. on the next to last pass, and a thickness of 45 mm. on the third from last pass, the distance of the reversing stand from the first finishing stand may be shortened in a ratio of 18:45 and therefore about 40% of the distance previously required.
  • the rolling length and thus the coil weight may be increased 250% as compared to that obtained in conventional operation.
  • the number of finishing stands may be reduced as for example from the conventional 6 to 4 Without having to reduce the coil weights or to increase the minimum strip thickness Which can be obtained.
  • the reversing stand may be operated with seven passes and, as mentioned, the length of the stock after the fifth pass is approximately equal to the distance of the reversing stand from the first finishing stand.
  • the improvement which comprises maintaining the first stand of the finishing train at a distance from the reversing stand less than the length of the stock after the last pass through the reversing stand, and feeding the stock into the first stand of the finishing train on its last pass through the reversing stand prior to complete emergence from the reversing stand and synchronizing the speed of the reversing stand and the first stand of the finishing train.

Description

Aug. 22, 1961 H. CRAMER ROLLING 0F METAL STOCK Filed April 17, 1957 UTE/7 4 T m em Patented Aug. 22, 1961 2,996,937 ROLLING F METAL STOCK Hans Cramer, Hankerstrasse 3, Eichen, Kreis Siegen, Germany Filed Apr. 17, 1957, Ser. No. 653,487 Claims priority, application Germany Apr. 23, 1956 1 Claim. (Cl. 80-60) This invention relates to new and useful improvements in the rolling of metal stock. The invention more particularly relates to an improved method and mill set-up for hot rolling metal stock in a strip mill provided with a reversing rougher and a continuously operating finish ing mill having several stands.
In the hot rolling strip mills having a reversing rougher and a continuously operating finishing mill consisting of several, as for example six, finishing stands, may be used. In operation, the stock is rolled back and forth in the reversing rougher mill a multiple number of passes. After the last pass through the reversing rougher, the stock is passed to and through the finishing mill. The stands of which are brought close together, so that the length of the finishing mill is much less than the length of the stock being rolled by the finishing mill.
The stand of the reversing rougher has been'positioned a sufficient distance from the first stand of the finishing mill so that the material being rolled passed through and clear of the reversing rougher on its last pass prior to being fed to the first stand of the finishing mill train. The distance between the reversing rougher and the first stand of the finishing train therefore had to be greater than the length of the material being rolled on its longest, i.e., last pass through the reversing rougher. Due to this requirement, the entire mill had to have a large structural length which, in addition to the obvious economic disadvantage, would result in a strong temperature loss and an increase in scaling of the rolled stock. These were the reasons which limit the maximum length of the rolled stock and therefore the maximum coil weight produced.
One object of this invention is a method for operating a hot-rolling strip mill and a strip mill construction which overcomes the above mentioned disadvantages. This, and still further objects, will become apparent from the following description read in conjunction with the drawing which diagrammatically shows an embodiment of a mill in accordance with the invention.
The invention is broadly directed to an improvement for the method of rolling stock in a hot-rolling strip mill having a reversing stand and a finishing train with several stands in which the stock is rolled back and forth in the reversing stand over a number of passes and thereafter passed through the finishing train and to an improvement in the construction of a hot-rolling strip mill of this type.
In accordance with the invention, the first stand of the finishing train is maintained at a distance from the reversing stand less than the length of the stock after its last pass through the reversing stand and the stock on its last pass through the reversing stand is fed into the first stand of the finishing train prior to a complete emergence from the reversing stand and the first stand of the finishing train, while synchronizing the speed of the reversing stand.
The synchronization of the speeds of the reversing stand and the first stand of the finishing train while the stock is simultaneously being passed therethrough, is preferably effected by adjusting the speed of the reversing stand at the end of its last pass as the stock is simultaneously fed into the finishing train to equal the speed of the first stand of the finishing train.
The first stand of the finishing train is preferably maintained at a distance from the reversing stand only a little more than the length of the stock after its third from last pass through the reversing stand.
The mill, in accordance with the invention, as contrasted with the prior art mill, is so constructed that the first stand of the finishing train is positioned to receive the rolled stock directly from the reversing stand on its last pass prior to complete emergence therefrom and means are provided, as for example, means to control the speed of the reversing stand for synchronizing the speed of the reversing stand and the first finishing stand while simultaneously engaging the same piece of rolled stock. The reversing stand and first stand of the finishing train are thus positioned at a distance from each other less than the length of the stock after its final pass and preferably at nearly the distance of the length of the stock after its third from last pass, as for example its fifth pass, when the mill is operated with for instance seven passes in the reversing stand.
The drawing is a plan View of a mill for use with the method disclosed. The finishing train preferably is provided with tour stands as contrasted to the conventional SIX.
Referring to the embodiment shown in the drawing, the hot-rolling strip mill has furnaces 1 for heating the slabs to be rolled, a reversing stand 2 provided with the pressure rollers 2 and a finishing train provided with four stands 3, 4, 5 and 6 and a coiler 7. The rollers of the stands are driven in the conventional manner by conventional drive means 2a, 3a, 4a, 5a, 6a respectively. The speeds of the rollers of the stands 3, 4, 5 and 6 of the continuous finishing train are in a known manner matched so that the stock is rolled continuously and simultaneously by said rollers. The speeds of the rollers of the reversing stand 2 are controlled by means of the control box 8 to the speeds of the rollers of the first stand 3 of the finishing train.
In operation the stock is moved in a conventional way from one of the furnaces: 1 to the reversing stand 2 and is then passed back and forth through the reversing stand 2 over a multiple number of passes, as for example 7 passes. The distance d between the reversing stand 2 and the first stand 3 of the finishing train is so adjusted to be nearly equal to the length of the stock after its third from last, as for example pass, through the reversing stand 2. On each pass through the reversing stand 2, the length of the stock is, of course, increased and in the drawing the stock 9 is shown in a position upon reaching the end of the third from last, as for example the fifth pass. As may be noted, the length of this pass is just sufiicient to reach the first stand 3 of the finishing train without being engaged by the rollers of the stand 3. On the next to last pass in the reverse direction, the length of the stock is increased and in the drawings is shown in dotted lines at 9a, and on the final or last pass the length of the stock is still further increased so that the same is approximately equal to 1.4d. With this additional length near the end of the last pass the stock will be engaged by the rollers of the first stand 3 of the finishing train while still being engaged on the last pass by the reversing stand. At this point, the speed of the rollers of the reversing stand 2 synchronize to that of the rollers of the first stand 3 of the finishing train. This synchronization may be effected, for example, by adjusting the speed of the rollers of the reversing stand 2 by means of the control box 8. The speed of the rollers referred to herein is the peripheral speed and not the revolutionary speed. The stock will then pass directly from the reversing stand 2 through the first stand 3 of the finishing train and through the subsequent stands of the finishing train as shown; the finished stock will than in the conventional Way be coiled up to coils by the coiler 7.
The invention allows a substantial decrease in the length of the mill as a Whole and conversely an increase in the length of the stock which may be rolled in a mill of a given length. If, for example, in accordance with the rolling program for the reversing stand, a thickness of 18 mm. is to be achieved on the last pass, a thickness of 30 mm. on the next to last pass, and a thickness of 45 mm. on the third from last pass, the distance of the reversing stand from the first finishing stand may be shortened in a ratio of 18:45 and therefore about 40% of the distance previously required. By the same token, in a mill of a given length, the rolling length and thus the coil weight may be increased 250% as compared to that obtained in conventional operation.
By dispensing with a shortening of the customary distance between the reversing stand and the first finishing stand, the number of finishing stands may be reduced as for example from the conventional 6 to 4 Without having to reduce the coil weights or to increase the minimum strip thickness Which can be obtained. In such an arrangement, the reversing stand may be operated with seven passes and, as mentioned, the length of the stock after the fifth pass is approximately equal to the distance of the reversing stand from the first finishing stand.
While the invention has been described in detail with reference to certain specific embodiments, various changes and modifications which fall within the spirit of the invention and scope of the appended claim will become apparent to the skilled artisan.
I claim:
In-the method for rolling stock in a strip rolling mill having a reversing stand and a finishing train with several stands in which the stock is rolled back and forth in the reversing stand over a number of passes and thereafter passed through the finishing train, the improvement which comprises maintaining the first stand of the finishing train at a distance from the reversing stand less than the length of the stock after the last pass through the reversing stand, and feeding the stock into the first stand of the finishing train on its last pass through the reversing stand prior to complete emergence from the reversing stand and synchronizing the speed of the reversing stand and the first stand of the finishing train.
References Cited in the file of this patent UNITED STATES PATENTS 1,021,468 McMurtry Mar. 26, 1912 1,736,324 Naugle et a1. Nov. 19, 1929 1,771,688 Nye July 29, 1930 1,895,303 Wilson Jan. 24, 1933 2,322,080 Wickler et al. June 15, 1943 2,332,803 Lorig Oct. 26, 1943 2,770,867 Spencer Nov. 20, 1956 FOREIGN PATENTS 464,513 Great Britain Apr. 19, 1937 505,968 Great Britain May 19, 1939
US653487A 1956-04-23 1957-04-17 Rolling of metal stock Expired - Lifetime US2996937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE800003X 1956-04-23

Publications (1)

Publication Number Publication Date
US2996937A true US2996937A (en) 1961-08-22

Family

ID=6711737

Family Applications (1)

Application Number Title Priority Date Filing Date
US653487A Expired - Lifetime US2996937A (en) 1956-04-23 1957-04-17 Rolling of metal stock

Country Status (5)

Country Link
US (1) US2996937A (en)
BE (1) BE555649A (en)
FR (1) FR1169710A (en)
GB (1) GB800003A (en)
LU (1) LU34997A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035077A1 (en) * 1980-03-04 1981-09-09 DAVY McKEE (SHEFFIELD) LIMITED Rolling method and apparatus
US4296623A (en) * 1979-09-12 1981-10-27 Blaw-Knox Foundry & Mill Machinery, Inc. Semi-continuous hot rolling of metal strip and plates
USRE31344E (en) * 1979-09-12 1983-08-16 White Consolidated Industries, Inc. Semi-continuous hot rolling of metal strip and plates
US20040089046A1 (en) * 1995-12-30 2004-05-13 Stephan Kramer Method and plant for the hot rolling of strip

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4348882A (en) * 1980-01-28 1982-09-14 Tippins Machinery Company, Inc. Hot rolling strip

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1021468A (en) * 1908-12-01 1912-03-26 George G Mcmurtry Apparatus for rolling shapes.
US1736324A (en) * 1927-05-24 1929-11-19 American Rolling Mill Co Strip-sheet manufacture
US1771688A (en) * 1927-01-26 1930-07-29 Ralph D Nye Method and apparatus for manufacturing metal sheets from ingots
US1895303A (en) * 1929-06-06 1933-01-24 Parker F Wilson Method and apparatus for metal rolling
GB464513A (en) * 1935-10-19 1937-04-19 Brassert & Co Improvements relating to the manufacture of rolled metal sheets
GB505968A (en) * 1939-01-23 1939-05-19 Lysaght Ltd John Improvements in or relating to rolling mills
US2322080A (en) * 1939-12-15 1943-06-15 Gen Electric Control for runout tables of reversing mills
US2332803A (en) * 1941-12-20 1943-10-26 Carnegie Illinois Steel Corp Method and apparatus for reducing metal bodies
US2770867A (en) * 1950-12-01 1956-11-20 British Insulated Callenders Arrangements for carrying out continuous processes on long rigid articles

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1021468A (en) * 1908-12-01 1912-03-26 George G Mcmurtry Apparatus for rolling shapes.
US1771688A (en) * 1927-01-26 1930-07-29 Ralph D Nye Method and apparatus for manufacturing metal sheets from ingots
US1736324A (en) * 1927-05-24 1929-11-19 American Rolling Mill Co Strip-sheet manufacture
US1895303A (en) * 1929-06-06 1933-01-24 Parker F Wilson Method and apparatus for metal rolling
GB464513A (en) * 1935-10-19 1937-04-19 Brassert & Co Improvements relating to the manufacture of rolled metal sheets
GB505968A (en) * 1939-01-23 1939-05-19 Lysaght Ltd John Improvements in or relating to rolling mills
US2322080A (en) * 1939-12-15 1943-06-15 Gen Electric Control for runout tables of reversing mills
US2332803A (en) * 1941-12-20 1943-10-26 Carnegie Illinois Steel Corp Method and apparatus for reducing metal bodies
US2770867A (en) * 1950-12-01 1956-11-20 British Insulated Callenders Arrangements for carrying out continuous processes on long rigid articles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4296623A (en) * 1979-09-12 1981-10-27 Blaw-Knox Foundry & Mill Machinery, Inc. Semi-continuous hot rolling of metal strip and plates
USRE31344E (en) * 1979-09-12 1983-08-16 White Consolidated Industries, Inc. Semi-continuous hot rolling of metal strip and plates
EP0035077A1 (en) * 1980-03-04 1981-09-09 DAVY McKEE (SHEFFIELD) LIMITED Rolling method and apparatus
US20040089046A1 (en) * 1995-12-30 2004-05-13 Stephan Kramer Method and plant for the hot rolling of strip

Also Published As

Publication number Publication date
BE555649A (en)
FR1169710A (en) 1959-01-05
GB800003A (en) 1958-08-20
LU34997A1 (en)

Similar Documents

Publication Publication Date Title
US5802902A (en) Production plant for continuously or discontinuously rolling hot strip
RU2268098C2 (en) Method for making thin flat articles and plant for performing the same
US5910184A (en) Method of manufacturing hot-rolled flat products
US5435164A (en) Apparatus and method for the manufacture of hot rolled metal strip
GB1347052A (en) Controlling rolling mill operation
JPH02175009A (en) Manufacture and apparatus for band steel to be hot-rolled
US4430874A (en) Vertical coiler furnace and method of rolling
US6182490B1 (en) Super thin strip hot rolling
US2369730A (en) Method of rolling metal bars
US2996937A (en) Rolling of metal stock
US4348882A (en) Hot rolling strip
GB1151427A (en) Method of and Apparatus for Rolling Flat Strip
US5771731A (en) Hot strip production plant for ferritic rolling and method of producing ferritic rolled strip
US2400690A (en) Method of rolling metal bars
US3553997A (en) Method of rolling bars cast in continuous casting plants
US4171632A (en) Method of and apparatus for hot-rolling a thin metal sheet
US2332803A (en) Method and apparatus for reducing metal bodies
JPS5584207A (en) Rolling equipment row of hot strip
US4420960A (en) Arrangement for hot-rolling of metal workpieces
US1857670A (en) Rolling metal strip
US5419172A (en) Continuously cast carbon and stainless steel hot-rolling mill
US3380277A (en) Process for gauge control in hot rolled sheet and strip
US1842220A (en) Sheet metal rolling process
US1754745A (en) Rolling strip metal
GB1125496A (en) A method for continuously rolling billets into wire or rod and means for carrying out the method