CN104399745A - Steekle mill production line provided with roughing mill and work method of steekle mill production line - Google Patents
Steekle mill production line provided with roughing mill and work method of steekle mill production line Download PDFInfo
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- CN104399745A CN104399745A CN201410653123.5A CN201410653123A CN104399745A CN 104399745 A CN104399745 A CN 104399745A CN 201410653123 A CN201410653123 A CN 201410653123A CN 104399745 A CN104399745 A CN 104399745A
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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
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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
- B21B1/30—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 non-continuous process
- B21B1/32—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
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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
- B21B2001/225—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 by hot-rolling
Abstract
The invention discloses a steekle mill production line provided with a roughing mill and a work method of the steekle mill production line. The production line comprises furnace region equipment, roughing milling region equipment, shearing region equipment, steekle mill region equipment and coiling region equipment, wherein the furnace region equipment, the roughing milling region equipment, the shearing region equipment, the steekle mill region equipment and the reeling region equipment are arranged in a sequence from the left side to the right side, the roughing milling region equipment comprises a four-roller reversible roughing mill, the steekle mill region equipment comprises a No.1 four-roller reversible steekle mill and a No.2 four-roller reversible steekle mill. The steekle mill production line has the advantages that one four-roller reversible roughing mill is arranged in the roughing milling region equipment, so that the temperature drop in the roughing milling stage of band steel can be smaller, and the fine milling inlet temperature can be ensured; the two four-roller reversible steekle mills are arranged in the fine milling region equipment, the milling efficiency is improved, and the reversible pass and the number of band passing times entering a coiling furnace in a fine milling stage are effectively reduced, so that the oxidation time of the band steel in the coiling furnace is shortened, and the surface quality and the yield of the band steel are ensured.
Description
Technical field
The present invention relates to field of steel metallurgy, be specifically related to a kind of the steekle mill production line and the method for work thereof that configure roughing mill, produce the narrow coils of hot-rolled steel of deformation temperature range by rational Equipments Setting and technological process.
Background technology
The design feature of steekle mill production line is configured with a coiler furnace respectively in the inlet/outlet side of reversing steckel mill.Be incubated because band steel can enter in coiler furnace in the operation of rolling, thus decrease the temperature drop of band steel, be therefore applicable to the steel grade that rolling deformation temperature range is narrow, as stainless steel and special steel etc.The features such as compared to hot continuous rolling production line, steekle mill production line has that investment comparatively economizes, floor space is less, produce and layout pattern is flexible.
Traditional steekle mill production-line arrangement pattern mainly contains following four kinds, is respectively:
(1) the steekle mill production line of single chassis layout pattern is four roller reversible steekle mills of the attached edger roll of 1 frame band, and its product produced is mainly Hot-rolled Middle Plate.
(2) the steekle mill production line of 1+1 layout pattern is four roller reversible roughing mill+1 frame four roller reversible steekle mills of the attached edger roll of 1 frame band, its main feature produces the narrow coils of hot-rolled steel of deformation temperature range, but because steekle mill reversible rolling passage is more, namely steel is with to enter in coiler furnace the number of times carrying out being incubated more, afterbody simultaneously with steel can not enter in coiler furnace and be incubated, thus make belt steel surface produce more secondary oxidation iron sheet, and make the larger with middle portion temperature difference end to end of band steel, cause its surface quality poor lower with lumber recovery.
(3) the steekle mill production line of 1+1+3 layout pattern is four roller reversible roughing mill+1 frame four roller reversible steekle mill+3 frame mm finishing mill unit of the attached edger roll of 1 frame band, its main feature produces the narrow coils of hot-rolled steel of deformation temperature range, but because milling train quantity is more, cause production line length longer larger with investment.
(4) the steekle mill production line of Stand Mill tandem layout pattern is Stand Mill four roller reversible steekle mill, its main feature produces hot-rolled carbon steel coil of strip, this is because Stand Mill tandem layout pattern does not configure roughing and finish rolling region separately, in order to ensure the maximum muzzle velocity of milling train, make the specified roll torque of milling train less.And the drafts of roughing is larger under normal circumstances, need larger roll torque, the billeting capacity that therefore result in this layout pattern is more weak, thus roughing passage is increased, can not entry temperature at finishing be ensured, not be suitable for the coil of strip that rolling is narrow compared with Thin Specs deformation temperature range.
Summary of the invention
For solving the problems referred to above that prior art exists, the present invention will propose a kind of steekle mill production line and the method for work thereof that can be conducive to the configuration roughing mill producing the coils of hot-rolled steel that deformation temperature range is narrow, surface quality better, lumber recovery is higher, thickness limit is thinner.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of steekle mill production line configuring roughing mill, comprise stove district equipment, roughing district equipment, shear zone equipment, steekle mill district equipment and coiling area equipment, described stove district equipment, roughing district equipment, shear zone equipment, steekle mill district equipment and coiling area equipment from left to right order are arranged;
Described stove district equipment comprises at least one heating furnace, and the material loading end of heating furnace and discharge end are provided with dress steel machine and extractor;
Described roughing district equipment from left to right order arranges high-pressure water descaler, vertical miller, four roller reversible roughing mills, steel scrap kickoff mechanism and waste collection stand, and the entrance side of four described roller reversible roughing mills and outlet side to be respectively arranged with before roughing mill manipulator after manipulator and roughing mill; The pressure mode of described vertical miller is complete hydraulic pressing mode, and has automatic width control and short stroke control function, to control strip width and to improve nose shape, vertical miller has the effect preventing rolled piece sideslip simultaneously; The pressure mode of four described roller reversible roughing mills is hydraulic pressure+Electro-pressing mode, has Hydraulic AGC simultaneously, controls the thickness of band steel;
Described shear zone equipment comprises flying shear, and the entrance side of described flying shear is provided with cuts front jig;
Described steekle mill district equipment from left to right order arranges finish rolling descaling mill, entrance coiler furnace, four roller reversible steekle mills, No. two four roller reversible steekle mills and outlet coiler furnace, the entrance side of described four roller reversible steekle mills is provided with steekle mill inlet side-guiding-board, the outlet side of No. two described four roller reversible steekle mills is provided with steekle mill outlet side guide plate, is provided with kink between steekle mill between described four roller reversible steekle mills and No. two four roller reversible steekle mills; Described four roller reversible steekle mills and the pressure mode of No. two four roller reversible steekle mills are complete hydraulic pressing mode, and there is hydraulic AGC system, work roll bending and corresponding plat control system, the thickness and plate shape being with steel is controlled;
Described coiling area equipment is sequentially set with cooling facility for laminar flow and at least one downcoiler from left to right, and the entrance side of described downcoiler is provided with jig on front side of coiling machine.
Configure a method of work for the steekle mill production line of roughing mill, comprise the following steps:
A. the qualified slab of zero defect obtained from continuous casting unit heats by filling steel machine loading heating furnace, and tapping temperature is 1150 ~ 1250 DEG C;
Slab, according to rolling rhythm, is held out by extractor, is put on furnace delivery table, be then delivered to high-pressure water descaler through roller-way by slab B. after heating successively, is removed the iron scale of slab upper and lower surface by water under high pressure;
C. the slab after de-scaling carries out the rolling of rough rolling step by vertical miller and four roller reversible roughing mills, the reversible passage of roughing is 5 ~ 7 passages, slab rolling is become the intermediate blank of 25 ~ 34mm, to need before first by roughing mill manipulator or roughing mill before every time rolling after, slab is carried out centering roll line by manipulator;
If D. rough rolling step produces rolling and to give up base, be then pushed on waste collection stand by the steel scrap kickoff mechanism after being arranged at four roller reversible roughing mills, otherwise processed; Otherwise, go to step E;
E. the intermediate blank after roughing is transported to share zone by delay table, first by cutting front jig by intermediate blank centering, and makes intermediate blank be directed into flying shear smoothly, then removes the irregular head of intermediate blank and afterbody by flying shear;
F. the intermediate blank after shearing enters steekle mill region, first the secondary oxidation iron sheet of upper and lower surface is removed by finish rolling descaling mill, then carried out the rolling in finish rolling stage by four roller reversible steekle mills and No. two four roller reversible steekle mills, intermediate blank is rolled into the band steel of required thickness;
G. in the finish rolling stage, first intermediate blank is passed through by under entrance coiler furnace, in four roller reversible steekle mills and No. two four roller reversible steekle mills, carry out the 1st passes.After strip steel head goes out No. two four roller reversible steekle mills, send into outlet coiler furnace by the pinch roll of outlet side and batch, the spool velocity of outlet coiler furnace is synchronous with mill speed; When being with steel to carry out reversible rolling, band steel is sent into entrance coiler furnace and is batched by the pinch roll of entrance side, and the spool velocity of same entrance coiler furnace is synchronous with mill speed.So, band steel carries out the reversible rolling of 3 passages, is rolled down to finished product thickness;
H. the band steel after finish rolling adopts suitable cooling system by cooling facility for laminar flow, band steel is cooled to the coiling temperature specified by finishing temperature, finally delivers to downcoiler and batch.
Compared with prior art, the present invention has following beneficial effect:
1, the present invention is configured with a frame four roller reversible roughing mill in roughing district equipment, its working roll roller footpath is comparatively large, makes the single pass drafts of rough rolling step comparatively large, has stronger billeting capacity, make band steel less at the temperature drop of rough rolling step, can entry temperature at finishing be ensured; Again owing to being configured with two coiler furnaces in finish rolling district equipment, on finish rolling rank, section strip steel can be incubated in coiler furnace, thus can reduce the temperature loss of band steel in the finish rolling stage; Steekle mill production line of the present invention decreases the temperature drop of band steel in whole production process, is therefore conducive to producing the narrow coils of hot-rolled steel of deformation temperature range.
2, the present invention is configured with two frame four roller reversible steekle mills in finish rolling district equipment, improve rolling efficiency, effectively decrease the reversible passage in finish rolling stage and enter the threading number of times of coiler furnace, accident rate is reduced, and the oxidization time of band steel in coiler furnace is shortened, thus ensure that surface quality and the lumber recovery of band steel;
3, the whole rolling cycle shortens, and decreases the temperature loss of band steel in the operation of rolling, is conducive to producing the thinner coils of hot-rolled steel of thickness limit.
Accompanying drawing explanation
The present invention is drawings attached 1 only, wherein:
Fig. 1 is process equipment layout drawing of the present invention.
In figure: 1-fills steel machine; 2-heating furnace; 3-extractor; 4-high-pressure water descaler; Manipulator before 5-roughing mill; 6-vertical miller; 7-tetra-roller reversible roughing mill; Manipulator after 8-roughing mill; 9-steel scrap kickoff mechanism; 10-waste collection stand; 11-cuts front jig; 12-flying shear; 13-finish rolling descaling mill; 14-entrance coiler furnace; 15-steekle mill inlet side-guiding-board; 16-four roller reversible steekle mills; Kink between 17-steekle mill; 18-No. bis-four roller reversible steekle mills; 19-steekle mill outlet side guide plate; 20-exports coiler furnace; 21-cooling facility for laminar flow; Jig on front side of 22-coiling machine; 23-downcoiler.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further.As shown in Figure 1, a kind of steekle mill production line configuring roughing mill, comprise stove district equipment, roughing district equipment, shear zone equipment, steekle mill district equipment and coiling area equipment, described stove district equipment, roughing district equipment, shear zone equipment, steekle mill district equipment and coiling area equipment from left to right order are arranged;
Described stove district equipment comprises at least one heating furnace 2, and the material loading end of heating furnace 2 and discharge end are provided with dress steel machine 1 and extractor 3;
Described roughing district equipment from left to right order arranges high-pressure water descaler 4, vertical miller 6, four roller reversible roughing mill 7, steel scrap kickoff mechanism 9 and waste collection stand 10, and the entrance side of four described roller reversible roughing mills 7 and outlet side to be respectively arranged with before roughing mill manipulator 8 after manipulator 5 and roughing mill; The pressure mode of described vertical miller 6 is complete hydraulic pressing mode, and has automatic width control and short stroke control function, to control strip width and to improve nose shape, vertical miller 6 has the effect preventing rolled piece sideslip simultaneously; The pressure mode of four described roller reversible roughing mills 7 is hydraulic pressure+Electro-pressing mode, has Hydraulic AGC simultaneously, controls the thickness of band steel;
Described shear zone equipment comprises flying shear 12, and the entrance side of described flying shear 12 is provided with cuts front jig 11;
Described steekle mill district equipment from left to right order arranges finish rolling descaling mill 13, entrance coiler furnace 14, four roller reversible steekle mill, 16, No. two four roller reversible steekle mills 18 and outlet coiler furnace 20, the entrance side of described four roller reversible steekle mills 16 is provided with steekle mill inlet side-guiding-board 15, the outlet side of No. two described four roller reversible steekle mills 18 is provided with steekle mill outlet side guide plate 19, is provided with kink 17 between steekle mill between described four roller reversible steekle mills 16 and No. two four roller reversible steekle mills 18; Described four roller reversible steekle mills 16 and the pressure mode of No. two four roller reversible steekle mills 18 are complete hydraulic pressing mode, and there is hydraulic AGC system, work roll bending and corresponding plat control system, the thickness and plate shape being with steel is controlled;
Described coiling area equipment is sequentially set with cooling facility for laminar flow 21 and at least one downcoiler 23 from left to right, and the entrance side of described downcoiler 23 is provided with jig 22 on front side of coiling machine.
Configure a method of work for the steekle mill production line of roughing mill, comprise the following steps:
A. the qualified slab of zero defect obtained from continuous casting unit loads heating furnace 2 heat by filling steel machine 1, and tapping temperature is generally 1150 ~ 1250 DEG C;
Slab, according to rolling rhythm, is held out by extractor 3, is put on furnace delivery table, be then delivered to high-pressure water descaler 4 through roller-way by slab B. after heating successively, is removed the iron scale of slab upper and lower surface by water under high pressure;
C. the slab after de-scaling carries out the rolling of rough rolling step by vertical miller 6 and four roller reversible roughing mills 7, the reversible passage of roughing is 5 ~ 7 passages, slab rolling is become the intermediate blank of 25 ~ 34mm, to need before first by roughing mill manipulator 5 or roughing mill before every time rolling after, slab is carried out centering roll line by manipulator 8;
If D. rough rolling step produces rolling and to give up base, be then pushed on waste collection stand 10 by the steel scrap kickoff mechanism 9 after being located at four roller reversible roughing mills 7, otherwise processed; Otherwise, go to step E;
E. the intermediate blank after roughing is transported to share zone by delay table, first by cutting front jig 11 by intermediate blank centering, and makes intermediate blank be directed into flying shear 12 smoothly, then removes the irregular head of intermediate blank and afterbody by flying shear;
F. the intermediate blank after shearing enters steekle mill region, first the secondary oxidation iron sheet of upper and lower surface is removed by finish rolling descaling mill 13, then carried out the rolling in finish rolling stage by four roller reversible steekle mills 16 and No. two four roller reversible steekle mills 18, intermediate blank is rolled into the band steel of required thickness;
G. in the finish rolling stage, first intermediate blank is passed through for 14 times by entrance coiler furnace, in 2 frame four roller reversible steekle mills, carry out the 1st passes.After strip steel head goes out No. two four roller reversible steekle mills 18, send into outlet coiler furnace 20 by the pinch roll of outlet side and batch, the spool velocity of outlet coiler furnace 20 is synchronous with mill speed; When being with steel to carry out reversible rolling, band steel is sent into entrance coiler furnace 14 and is batched by the pinch roll of entrance side, and the spool velocity of same entrance coiler furnace 14 is synchronous with mill speed.So, band steel carries out the reversible rolling of 3 passages, is rolled down to finished product thickness;
H. the band steel after finish rolling adopts suitable cooling system by cooling facility for laminar flow 21, band steel is cooled to the coiling temperature specified by finishing temperature, finally delivers to downcoiler 23 and batch.
Claims (2)
1. one kind configures the steekle mill production line of roughing mill, it is characterized in that: comprise stove district equipment, roughing district equipment, shear zone equipment, steekle mill district equipment and coiling area equipment, described stove district equipment, roughing district equipment, shear zone equipment, steekle mill district equipment and coiling area equipment from left to right order are arranged;
Described stove district equipment comprises at least one heating furnace (2), and the material loading end of heating furnace (2) and discharge end are provided with dress steel machine (1) and extractor (3);
Described roughing district equipment from left to right order arranges high-pressure water descaler (4), vertical miller (6), four roller reversible roughing mills (7), steel scrap kickoff mechanism (9) and waste collection stand (10), and the entrance side of four described roller reversible roughing mills (7) and outlet side to be respectively arranged with before roughing mill manipulator (8) after manipulator (5) and roughing mill; The pressure mode of described vertical miller (6) is complete hydraulic pressing mode, and there is automatic width control and short stroke control function, to control strip width and to improve nose shape, vertical miller (6) has the effect preventing rolled piece sideslip simultaneously; The pressure mode of four described roller reversible roughing mills (7) is hydraulic pressure+Electro-pressing mode, has Hydraulic AGC simultaneously, controls the thickness of band steel;
Described shear zone equipment comprises flying shear (12), and the entrance side of described flying shear (12) is provided with cuts front jig (11);
Described steekle mill district equipment from left to right order arranges finish rolling descaling mill (13), entrance coiler furnace (14), four roller reversible steekle mills (16), No. two four roller reversible steekle mills (18) and outlet coiler furnace (20), the entrance side of described four roller reversible steekle mills (16) is provided with steekle mill inlet side-guiding-board (15), the outlet side of No. two described four roller reversible steekle mills (18) is provided with steekle mill outlet side guide plate (19), kink between steekle mill (17) is provided with between described four roller reversible steekle mills (16) and No. two four roller reversible steekle mills (18), described four roller reversible steekle mills (16) and the pressure mode of No. two four roller reversible steekle mills (18) are complete hydraulic pressing mode, and there is hydraulic AGC system, work roll bending and corresponding plat control system, the thickness and plate shape being with steel is controlled,
Described coiling area equipment is sequentially set with cooling facility for laminar flow (21) and at least one downcoiler (23) from left to right, and the entrance side of described downcoiler (23) is provided with jig on front side of coiling machine (22).
2. configure a method of work for the steekle mill production line of roughing mill, it is characterized in that: comprise the following steps:
A. the qualified slab of zero defect obtained from continuous casting unit heats by filling steel machine (1) loading heating furnace (2), and tapping temperature is 1150 ~ 1250 DEG C;
Slab, according to rolling rhythm, is held out by extractor (3), is put on furnace delivery table, be then delivered to high-pressure water descaler (4) through roller-way by slab B. after heating successively, is removed the iron scale of slab upper and lower surface by water under high pressure;
C. the slab after de-scaling carries out the rolling of rough rolling step by vertical miller (6) and four roller reversible roughing mills (7), the reversible passage of roughing is 5 ~ 7 passages, slab rolling is become the intermediate blank of 25 ~ 34mm, to need before first by roughing mill manipulator (5) or roughing mill before every time rolling after, slab is carried out centering roll line by manipulator (8);
If D. rough rolling step produces rolling and to give up base, be then pushed on waste collection stand (10) by the steel scrap kickoff mechanism (9) after being arranged at four roller reversible roughing mills (7), otherwise processed; Otherwise, go to step E;
E. the intermediate blank after roughing is transported to share zone by delay table, first by cutting front jig (11) by intermediate blank centering, and make intermediate blank be directed into flying shear (12) smoothly, then remove the irregular head of intermediate blank and afterbody by flying shear (12);
F. the intermediate blank after shearing enters steekle mill region, first the secondary oxidation iron sheet of upper and lower surface is removed by finish rolling descaling mill (13), then carried out the rolling in finish rolling stage by four roller reversible steekle mills (16) and No. two four roller reversible steekle mills (18), intermediate blank is rolled into the band steel of required thickness;
G. in the finish rolling stage, first intermediate blank is passed through by under entrance coiler furnace (14), in four roller reversible steekle mills (16) and No. two four roller reversible steekle mills (18), carry out the 1st passes; After strip steel head goes out No. two four roller reversible steekle mills (18), send into outlet coiler furnace (20) by the pinch roll of outlet side and batch, the spool velocity of outlet coiler furnace (20) is synchronous with mill speed; When being with steel to carry out reversible rolling, the pinch roll of entrance side will be with steel to send into entrance coiler furnace (14) and batch, and the spool velocity of same entrance coiler furnace (14) is synchronous with mill speed; So, band steel carries out the reversible rolling of 3 passages, is rolled down to finished product thickness;
H. the band steel after finish rolling adopts suitable cooling system by cooling facility for laminar flow (21), band steel is cooled to the coiling temperature specified by finishing temperature, finally delivers to downcoiler (23) and batch.
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| CN106583455A (en) * | 2017-02-07 | 2017-04-26 | 唐山市丰南区嘉谊牧栏杆厂 | Fence stake continuous casting and rolling production line based on intermediate frequency furnace smelting |
| CN111014307A (en) * | 2019-11-21 | 2020-04-17 | 北京科技大学 | Rolling mill speed control method for continuous rolling of furnace coil and finishing mill set |
| CN110935726A (en) * | 2019-11-26 | 2020-03-31 | 陕西凸鹏钛锆股份有限公司 | Continuous rolling solution treatment process for TC4 titanium alloy strip |
| CN111517105A (en) * | 2020-05-10 | 2020-08-11 | 湖南华菱湘潭钢铁有限公司 | Head-off transverse moving rack |
| CN111842483A (en) * | 2020-07-02 | 2020-10-30 | 武汉科技大学 | Multi-mode energy-saving hot-rolled strip steel production line and using method thereof |
| CN112705569A (en) * | 2020-12-09 | 2021-04-27 | 一重集团大连工程技术有限公司 | Steckel mill production line with ultra-short distance arrangement and rolling process |
| CN112705569B (en) * | 2020-12-09 | 2022-09-23 | 一重集团大连工程技术有限公司 | Steckel mill production line with ultra-short distance arrangement and rolling process |
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