CN111112327B - Steel rail production process with limited participation of universal rolling mill - Google Patents
Steel rail production process with limited participation of universal rolling mill Download PDFInfo
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- CN111112327B CN111112327B CN202010067113.9A CN202010067113A CN111112327B CN 111112327 B CN111112327 B CN 111112327B CN 202010067113 A CN202010067113 A CN 202010067113A CN 111112327 B CN111112327 B CN 111112327B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 100
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000013461 design Methods 0.000 claims abstract description 13
- 238000007688 edging Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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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
- B21B1/085—Rail sections
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a steel rail production process with limited participation of a universal rolling mill, belonging to the technical field of steel rail rolling in the metallurgical industry. Universal UR2 hole patterns are arranged between finished UF hole patterns and edge rolling EF hole patterns, a rolled piece forms continuous rolling among the universal UR, the edge rolling EF and the universal UR2, finished UF is independently arranged, and the end of the finished UF is removed for rolling; UR2 adopts soft reduction during pass design, and limited participation in rolling production scheme, so that the height direction of rail head is accurately controlled before the steel rail rolled piece enters finished product UF, size fluctuation of the steel rail product in the height direction is effectively solved, and running smoothness of high-speed rail is improved.
Description
Technical Field
The invention relates to a steel rail production process with limited participation of a universal rolling mill in production, belonging to the technical field of steel rail rolling in the metallurgical industry.
Background
The universal rolling mill is developed rapidly in the 60 s of the 20 th century, the first universal rolling production line of steel rails in 2004 in China is put into production in saddle steel construction, and the method for producing the steel rails by the universal rolling mill is to perform medium rolling on a rolling piece with a primary rail shape, which is rolled by a cogging mill, on a universal roughing mill and an edging mill, and finally, a finished product is rolled by a universal finishing mill group. The last 3 rolling passes in the universal method steel rail production process are as follows: universal UR rolling, edging EF rolling and finished product UF rolling. The universal UR system adopts a hole pattern formed by a pair of horizontal rolls and a pair of vertical rolls, wherein the horizontal rolls are used for rolling the waist part of a steel rail, one vertical roll is provided with the hole pattern and is used for rolling the head part of the steel rail, and the vertical roll is called a head-side vertical roll, and the other vertical roll is a flat roll and is used for rolling the bottom part (leg part) of the steel rail, and is called a bottom-side vertical roll; the edging EF adopts two flat rolls to form a hole pattern, and mainly processes the rail bottom height and the rail head width direction; the finished product UF adopts a pair of horizontal rollers and rail bottom side vertical rollers to form a semi-universal hole pattern, wherein waist parts are manufactured by the horizontal rollers and hot rolling marks are formed by the horizontal rollers, and the bottom side vertical rollers are used for rolling the thickness of the bottom of the steel rail.
With the rapid development of high-speed rail technology, the requirement of railways on the height fluctuation of steel rails is higher and higher, the latest electronic leveling technology is applied to rail welding bases, and the steel rails with the height points larger than 0.25mm are all regarded as unqualified products. The universal method production process adopted by steel rail rolling cannot effectively meet the requirement, a large amount of waste products are generated, and once the steel rail is on line, the driving safety is seriously influenced. The main causes of the problems are:
(1) after UR holes are rolled, the height direction of the rail head is preliminarily controlled, but a continuous rolling relation is formed among racks when UR, edge EF and finished product UF are rolled, the metal filling state of the opening position of a roll gap is changed due to the fluctuation of continuous rolling tension, and the size of the corresponding rail head in the height direction fluctuates;
(2) the total length of the steel rail is 105 meters, the rolling period is 10 minutes, the finish rolling time of a single pass is 30 seconds, the temperatures of the head and the tail of the steel rail are different during rolling, the center of the rail head is at the opening position of the corresponding roll gap of the last two passes (edging EF and finished product UF), the metal filling state changes due to the temperature difference, and the size of the corresponding rail head in the height direction fluctuates.
For the above reasons, the height direction of the rail rolled by the universal method has certain fluctuation, and local high point or low point defects sometimes occur.
Disclosure of Invention
The invention aims to solve the technical problem of providing a steel rail production process with limited participation of a universal rolling mill, so that a rolled piece before entering UF is accurately controlled in the height direction of a rail head, meanwhile, UF is independently rolled, no tension influences the size of the rolled piece, and the size fluctuation of a steel rail product in the height direction is effectively solved.
The technical scheme of the invention is as follows:
the steel rail production process with limited participation of the universal rolling mill comprises the steps of continuously rolling the universal UR-edging EF-universal UR2 and performing end-off rolling with a finished product UF which is independently arranged; a universal UR2 rolling procedure is added between a finished product UF rolling procedure and an edging EF rolling procedure, the universal UR, the edging EF and the universal UR2 form a continuous rolling relation, finished product UF is independently arranged, and the universal UR2 adopts a design principle of limited participation during hole pattern design, so that the height direction of a rail head is accurately controlled before a steel rail rolled piece enters the finished product UF.
The universal UR2 is the same as the universal UR in structure and comprises a pair of horizontal rollers and a pair of vertical rollers, the pair of horizontal rollers are an universal UR2 upper roller and an universal UR2 lower roller, and the pair of vertical rollers comprise a universal UR2 head side vertical roller and a universal UR2 bottom side vertical roller; the universal UR2 upper roller and the universal UR2 lower roller are used for rolling the waist part of the steel rail, the universal UR2 head side vertical roller is used for machining the head part of the steel rail, and the universal UR2 bottom side vertical roller is used for machining the leg part of the steel rail; the universal UR2 rail web is designed by 8-11% compression, the universal UR2 head side vertical roll is designed by 2-4 mm small rolling reduction, the extension coefficient of the universal UR2 rail bottom and rail web is designed to be 1.04-1.1, and the rolling reduction of the universal UR2 bottom side vertical roll is designed to be 0.7-1.5 mm.
In the steel rail production process with limited participation of the universal rolling mill, the universal UR2, the edging EF and the universal UR are simultaneously rolled, and a continuous rolling relationship is established between frames.
In the steel rail production process with limited participation of the universal rolling mill, the finished product UF is independently arranged, and is subjected to end-off rolling with the universal UR, the edging EF and the universal UR2 without forming continuous rolling.
The principle of the invention is as follows:
the main source of the high fluctuation of the steel rail is the tension fluctuation during continuous rolling, the tension fluctuation is influenced by factors such as rolling temperature, pass structure, contact state, rolling pressure, biting and tailing throwing states, and the like, the steel rail production process with limited participation of the universal rolling mill is that universal UR2 is used at the tail frame of the continuous rolling mill to participate in production, and the universal UR2 is designed under the principle of not damaging the deformation coefficients of all parts of the original pass, so that the effective control of the height of the steel rail is realized.
The steel rail has only one symmetrical axis, belongs to the special section steel, has large uneven deformation in the rolling process, and the hole pattern design needs to be combined with the specific division of the section of the steel rail, so that the contact state, the speed difference, the plastic deformation characteristic, the biting, the leading and lagging degrees in the rolling process, the geometrical characteristics before and after rolling and other factors of each part are fully considered. When the universal UR2 hole pattern is designed, the rail section is divided into three mutually-associated and mutually-independent parts, namely a rail head, a rail web and a rail bottom, and the design is carried out according to the principle that metal transfer does not occur in the rolling process of each part, namely the volume of each part is unchanged, namely:
Vhead UR=VHead EF=VHead UR2
VWaist UR=VWaist EF=VWaist UR2
VBottom UR=VBottom EF=VBottom UR2
Wherein: vHead URHead part volume in UR Rolling
VHead EFRail head part volume at EF Rolling
VHead UR2Head part volume of rail when UR2 is rolled
VWaist xxRail web part volume during rolling of each pass
VBottom xxVolume of rail foot portion in rolling of each pass
The UR2 pass rail head part is composed of 4 sections of arcs, the too large rolling reduction causes the fluctuation of the height of the rail and the filling state of the transition arc of the gauge angle, the too small rolling reduction can not effectively process the rail head, and after a plurality of experiments, the 2-4 mm small rolling reduction of the universal UR2 head side vertical roll can meet the design requirement. The rail web compression coefficient is designed on the principle of avoiding mutual transfer and flow of rail head, rail web and rail bottom metal, effective realization of subsequent rolling identification is guaranteed, and finally the universal UR2 rail web compression coefficient is designed to be 8-11%. The universal UR2 rail web and rail bottom extension coefficient can be designed according to the compression deformation condition of the rail web, and is 1.04-1.1. The rail bottom rolling reduction is determined according to extension balance of each part of the steel rail and relevant parameters of leg deformation, and can be designed approximately according to the principle of open hole leg deformation, the rolled bending or rail bottom width fluctuation can be caused by improper rolling, and the universal UR2 bottom side vertical roll rolling reduction is designed to be 0.7-1.5 mm after multiple practices.
Finished UF is separated from the front rolling mill to realize end-off rolling, and the rail production process with limited participation can provide high stability for rails fed before finished UF. The sudden change of the height of the steel rail after finished product UF rolling can be controlled within 0.25 mm.
The invention has the beneficial effects that:
the invention enables the height direction of the rail head to be accurately controlled before the rolled piece of the steel rail enters the finished product UF, and the sudden change of the height of the steel rail can be controlled within 0.25mm after the finished product UF is rolled; the problems of size fluctuation and high and low points in the height direction of steel rail products are effectively solved, and the qualification rate of the steel rail finished products and the running smoothness of high-speed rails are greatly improved.
Drawings
FIG. 1 is a route diagram of a process for producing steel rails by a universal method in the background art;
FIG. 2 is a schematic diagram of a steel rail production process route with limited participation of the universal rolling mill of the present invention;
labeled as: universal UR upper rolls 1, universal UR lower rolls 2, universal UR head-side vertical rolls 3, universal UR bottom-side vertical rolls 4, edging EF upper rolls 5, edging EF lower rolls 6, universal UR2 upper rolls 7, universal UR2 lower rolls 8, universal UR2 head-side vertical rolls 9, universal UR2 bottom-side vertical rolls 10, finished UF upper rolls 11, finished UF lower rolls 12, finished UF head-side vertical rolls 13, finished UF bottom-side vertical rolls 14, universal UR hole rolled pieces 15, edging EF hole rolled pieces 16, universal UR2 hole rolled piece 17 and finished UF hole rolled pieces 18.
Detailed Description
The invention is further illustrated by way of example in the following with reference to the accompanying drawings.
Referring to the attached figure 2, the steel rail production process with limited participation of the universal rolling mill comprises the following process routes: universal UR rolling, edging EF rolling, universal UR2 rolling and finished product UF rolling; the universal UR consists of a pair of horizontal rollers and a pair of vertical rollers, wherein the pair of horizontal rollers are an upper universal UR roller 1 and a lower universal UR roller 2, and the pair of vertical rollers are a head side universal UR roller 3 and a bottom side universal UR roller 4; the universal UR upper roller 1 and the universal UR lower roller 2 are used for rolling the waist part of the steel rail, the universal UR head side vertical roller 3 is used for processing the head part of the steel rail, and the universal UR bottom side vertical roller 4 is used for processing the leg part of the steel rail; the edging EF consists of a pair of horizontal rollers, comprises an edging EF upper roller 5 and an edging EF lower roller 6, and mainly processes the rail bottom height and the rail head width of a rolled piece; the universal UR2 consists of a pair of horizontal rollers and a pair of vertical rollers, wherein the horizontal rollers are a universal UR2 upper roller 7 and a universal UR2 lower roller 8, and the vertical rollers comprise a universal UR2 head side vertical roller 9 and a universal UR2 bottom side vertical roller 10; the universal UR2 upper roller 7 and the universal UR2 lower roller 8 are used for rolling the waist part of the steel rail, the universal UR2 head side vertical roller is used for machining the head part of the steel rail, and the universal UR2 bottom side vertical roller is used for machining the leg part of the steel rail; the rail web of the pass is designed by 8-11% compression, the universal UR2 head-side vertical roll is designed with a small rolling reduction of 2-4 mm, and is limited to participate in rail rolling, the extension coefficients of the rail bottom and the rail web of the universal UR2 are designed to be 1.04-1.1, and the rolling reduction of the universal UR2 bottom-side vertical roll is 0.7-1.5 mm; the finished product UF consists of a pair of horizontal rollers and a pair of vertical rollers, wherein the pair of horizontal rollers comprises a finished product UF upper roller 11 and a finished product UF lower roller 12, the pair of vertical rollers comprises a finished product UF head side vertical roller 13 and a finished product UF bottom side vertical roller 14, the finished product UF upper roller 11 and the finished product UF lower roller 12 are used for rolling the waist part of the steel rail and processing a hot rolling mark on the waist part of the finished product, the finished product UF bottom side vertical roller 14 is used for forming and processing the leg part of the steel rail, and the finished product UF head side vertical roller 13 is only used when being marked and does not participate in the pass rolling;
the steel rail is sequentially rolled in a universal UR, an edging EF and a universal UR2 to form a continuous rolling relation, and the steel rail is respectively rolled into a universal UR hole rolled piece 15, an edging EF hole rolled piece 16 and a universal UR2 hole rolled piece 17 by universal UR, edging EF and universal UR2 rolling mills; the steel rail is rolled in the universal UR2 by adopting light pressing, participates in rolling in a limited way, and the height direction of the rail head of the universal UR2 hole rolled piece 17 is accurately controlled after continuous rolling;
and after the universal UR2 hole rolled piece 17 is separated from a universal UR2 rolling mill, the universal UR2 hole rolled piece enters a finished product UF rack for rolling, a finished product UF is in a hole shape formed by a finished product UF upper roller 11, a finished product UF lower roller 12 and a finished product UF bottom side vertical roller 14, and after the finished product UF is rolled by a finished product UF rolling mill, a finished product UF hole rolled piece 18 enters a next working procedure for cooling.
Examples 1 to 7:
in the process design and production of TB/T3276-iron standard 60N steel rail, TB/T2344-iron standard 50kg/m and 75kg/m steel rail, EN 13674.1-European standard 60E2 and 54E1 steel rail, BS-11-English standard BS100A steel rail and SS American standard 115RE steel rail, the steel rail production process with limited participation of a universal rolling mill is adopted. The last rolling process of the universal rolling mill is universal UR-edging EF-universal UR2 rolling and forms a continuous rolling relation, the universal UR and edging EF adopt conventional design, the universal UR2 adopts light reduction and limited participation in a rolling design scheme, and universal UR2 hole pattern design parameters are shown in a table 1:
and (4) after the rolled piece is completely separated from the universal UR2, the rolled piece enters a finished product UF rack, and is rolled in a hole pattern formed by a finished product UF upper roller 11, a finished product UF lower roller 12 and a finished product UF bottom side vertical roller 14, so that the steel rail forming processing and hot rolling marking are completed.
Table 1: universal UR2 pass design parameter table
As can be seen from Table 1, the height variation of the steel rails rolled in the embodiments 1 to 7 is less than or equal to 0.25, the requirement of the railway on the height fluctuation of the steel rails is completely met, and the product yield of the steel rails is greatly improved, and the safety and the smoothness of the steel rails are improved.
Claims (1)
1. The steel rail production process with limited participation of the universal mill is characterized in that: the method comprises universal UR-edging EF-universal UR2 continuous rolling and finished product UF end-removing rolling, wherein the universal UR, edging EF and universal UR2 form a continuous rolling relation, and the finished product UF is independently arranged and forms end-removing rolling with the previous pass; the universal UR2 adopts a design principle of limited participation during hole pattern design, so that the height direction of a rail head is accurately controlled before a steel rail rolled piece enters a finished product UF; the universal UR2 is the same as the universal UR in structure and consists of a pair of horizontal rollers and a pair of vertical rollers, the pair of horizontal rollers are a universal UR2 upper roller (7) and a universal UR2 lower roller (8), and the pair of vertical rollers comprise a universal UR2 head side vertical roller (9) and a universal UR2 bottom side vertical roller (10); the universal UR2 upper roller (7) and the universal UR2 lower roller (8) are used for rolling the waist part of the steel rail, the universal UR2 head side vertical roller (9) is used for machining the head part of the steel rail, and the universal UR2 bottom side vertical roller (10) is used for machining the leg part of the steel rail; the universal UR2 rail web is designed by 8-11% compression, the universal UR2 head side vertical roll (9) is designed by 2-4 mm small rolling reduction, the universal UR2 rail bottom and rail web extension coefficient is designed to be 1.04-1.1, and the universal UR2 bottom side vertical roll (10) rolling reduction is designed to be 0.7-1.5 mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067113.9A CN111112327B (en) | 2020-01-20 | 2020-01-20 | Steel rail production process with limited participation of universal rolling mill |
| HU2000446A HUP2000446A1 (en) | 2020-01-20 | 2020-12-22 | Rail rolling process with limited participation of universal rolling mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067113.9A CN111112327B (en) | 2020-01-20 | 2020-01-20 | Steel rail production process with limited participation of universal rolling mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111112327A CN111112327A (en) | 2020-05-08 |
| CN111112327B true CN111112327B (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010067113.9A Active CN111112327B (en) | 2020-01-20 | 2020-01-20 | Steel rail production process with limited participation of universal rolling mill |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111112327B (en) |
| HU (1) | HUP2000446A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112264462B (en) * | 2020-10-13 | 2022-11-15 | 邯郸钢铁集团有限责任公司 | All-purpose production process for steel rail tread composite forming |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5930488B2 (en) * | 1976-06-14 | 1984-07-27 | 新日本製鐵株式会社 | Universal rolling method of section steel with different flange thickness using offset method |
| CN1065609A (en) * | 1991-02-08 | 1992-10-28 | 住友金属工业株式会社 | Rolling of sectional iron method and rolling equipment |
| CN101844150A (en) * | 2010-05-18 | 2010-09-29 | 攀钢集团钢铁钒钛股份有限公司 | Universal rolling technology for rails |
| CN102215989A (en) * | 2008-11-20 | 2011-10-12 | 杰富意钢铁株式会社 | Process for producing t-bar steel and series of rolling devices |
| CN103071673A (en) * | 2013-02-01 | 2013-05-01 | 中冶赛迪工程技术股份有限公司 | Compact universal vertical steel rail rolling method |
| CN109078987A (en) * | 2018-08-02 | 2018-12-25 | 攀钢集团攀枝花钢钒有限公司 | Mitigate the method for rail tail portion high point in omnipotent tandem rolling |
-
2020
- 2020-01-20 CN CN202010067113.9A patent/CN111112327B/en active Active
- 2020-12-22 HU HU2000446A patent/HUP2000446A1/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5930488B2 (en) * | 1976-06-14 | 1984-07-27 | 新日本製鐵株式会社 | Universal rolling method of section steel with different flange thickness using offset method |
| CN1065609A (en) * | 1991-02-08 | 1992-10-28 | 住友金属工业株式会社 | Rolling of sectional iron method and rolling equipment |
| CN102215989A (en) * | 2008-11-20 | 2011-10-12 | 杰富意钢铁株式会社 | Process for producing t-bar steel and series of rolling devices |
| CN101844150A (en) * | 2010-05-18 | 2010-09-29 | 攀钢集团钢铁钒钛股份有限公司 | Universal rolling technology for rails |
| CN103071673A (en) * | 2013-02-01 | 2013-05-01 | 中冶赛迪工程技术股份有限公司 | Compact universal vertical steel rail rolling method |
| CN109078987A (en) * | 2018-08-02 | 2018-12-25 | 攀钢集团攀枝花钢钒有限公司 | Mitigate the method for rail tail portion high point in omnipotent tandem rolling |
Also Published As
| Publication number | Publication date |
|---|---|
| HUP2000446A1 (en) | 2021-07-28 |
| CN111112327A (en) | 2020-05-08 |
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