CN110814023A - Rolling process of large and super-large section steel in double-reversible finish rolling area - Google Patents
Rolling process of large and super-large section steel in double-reversible finish rolling area Download PDFInfo
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- CN110814023A CN110814023A CN201911108123.6A CN201911108123A CN110814023A CN 110814023 A CN110814023 A CN 110814023A CN 201911108123 A CN201911108123 A CN 201911108123A CN 110814023 A CN110814023 A CN 110814023A
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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
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Abstract
The invention provides a rolling process of a large and super large section steel in a reversible finish rolling area, which comprises a rough rolling area, a reversible first finish rolling area and a reversible second finish rolling area which are independently arranged, wherein a steel billet is heated by a heating furnace and then enters a phosphorus removal machine for phosphorus removal to enter the rough rolling area, a cogging mill is arranged in the rough rolling area, and cogging reversible rolling is carried out at the cogging mill; then, the steel billet is transported to a reversible first finish rolling area, and a first universal rolling mill, an edge rolling machine I and a second universal rolling mill are arranged in parallel in the reversible first finish rolling area to perform reversible rolling in the first finish rolling area; and finally, conveying the steel billet to a reversible second finish rolling area, and arranging a third universal rolling mill, a second edger and a fourth universal rolling mill in the reversible second finish rolling area in parallel to perform reversible rolling in the second finish rolling area. The rolling process of the large and oversized section steel in the double reversible finish rolling area effectively reduces the reciprocating pass of a single area, improves the production rhythm and yield of a production line, and reduces the cost of steel per ton.
Description
Technical Field
The invention belongs to the field of rolling processes of large-sized steel, and particularly relates to a rolling process of large-sized and oversized steel in a double-reversible finish rolling area.
Background
As the H-shaped steel is used as a product with large market demand at the present stage, new H-shaped steel projects are continuously developed in China due to large demand and considerable profits per ton of steel. The H-shaped steel production line can be roughly divided into a large-scale/ultra-large-scale production line, a medium-scale production line and a small-scale production line. In the rolling area of large/ultra-large production lines, one cogging mill and three finishing mills are generally adopted, wherein the cogging mill and the finishing mill are introduced abroad, one finishing mill is an edger in the middle of the three finishing mills, and all the finishing mills are arranged in a reciprocating rolling process (hereinafter referred to as '1 +3 arrangement'). The rolling passes of the H-shaped steel are more, when the H-shaped steel is rolled by using the traditional arrangement process, the reciprocating times of the blank in a rough rolling area and a finish rolling area are too many, the rolling time of a single blank in the rough rolling area or the finish rolling area is too long, and the overall production rhythm and efficiency are influenced. In the previous years, the number of large and ultra-large production lines in China is small, the demand is not so large, the traditional 1+3 arrangement rolling process can completely meet the market requirement, the demand of H-shaped steel is continuously increased in recent years, and a plurality of enterprises newly enter the large and ultra-large H-shaped steel production lines, so that the yield is increased, and the competition is increased. The cost of each ton of steel can be reduced only by a large-scale high-yield production mode, and the enterprise competitiveness is improved.
Disclosure of Invention
In view of the above, the present invention aims to provide a rolling process for large and ultra-large steel sections in a double reversible finish rolling zone, so as to solve the problems of how to increase the output of large and ultra-large production lines and reduce the cost of steel per ton.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a rolling process of large and ultra-large section steel in a reversible finish rolling area comprises a rough rolling area, a reversible first finish rolling area and a reversible second finish rolling area which are arranged independently, wherein a steel billet is heated by a heating furnace and then enters a dephosphorizing machine for dephosphorization, and then enters the rough rolling area, a cogging mill is arranged in the rough rolling area, and cogging reversible rolling is carried out at the cogging mill; then, the steel billet is transported to a reversible first finish rolling area, and a first universal rolling mill, an edge rolling machine I and a second universal rolling mill are arranged in parallel in the reversible first finish rolling area to perform reversible rolling in the first finish rolling area; and finally, conveying the steel billet to a reversible second finish rolling area, and arranging a third universal rolling mill, a second edger and a fourth universal rolling mill in the reversible second finish rolling area in parallel to perform reversible rolling in the second finish rolling area.
Furthermore, the cogging mill is provided with two rolling tracks which are of a hole-type structure formed between the upper roller and the lower roller, the two rolling tracks are respectively a first track and a second track, the reciprocating rolling times of the billet on the first track are even times, and the reciprocating rolling times on the second track are odd times.
Furthermore, a rolling track is arranged on each of the first universal rolling mill, the first edge rolling mill and the second universal rolling mill, the times of the reciprocating rolling of the steel billet on the first universal rolling mill and the second universal rolling mill are odd, and the rolling pass is not counted in the rolling of the first edge rolling mill.
Furthermore, a rolling track is arranged on each of the third universal rolling mill, the second edger and the fourth universal rolling mill, the times of the reciprocating rolling of the steel billet on the third universal rolling mill and the fourth universal rolling mill are odd, and the rolling pass is not counted in the rolling of the second edger.
Further, the BI value of the pass of the rolling track increases with the work order, the sidewall inclination of the pass on both sides of the rolling track decreases with the work order, and the radius of the fillet R decreases with the work order.
Furthermore, the rough rolling area, the reversible first finish rolling area and the reversible second finish rolling area are respectively provided with a transmission device and a quick roll changing device.
And further, performing end-off rolling in the rough rolling area, the reversible first finish rolling area and the reversible second finish rolling area.
Furthermore, the models of the first universal rolling mill, the second universal rolling mill, the third universal rolling mill and the fourth universal rolling mill are completely the same, the models of the first edging mill and the second edging mill are completely the same, and all the quick roll changing devices and spare parts are also completely the same.
Compared with the prior art, the rolling process of the large and oversized section steel in the double reversible finish rolling area has the following advantages:
(1) the rolling process of the large and ultra-large section steel in the double reversible finish rolling area effectively reduces the reciprocating pass of a single area, improves the production rhythm of a production line, increases the flexibility of the production line, reduces energy consumption, reduces roller abrasion, and finally achieves the main aims of improving the yield and reducing the cost of steel per ton.
(2) According to the rolling process of the large and oversized section steel in the double-reversible finish rolling area, the pass-back pass of a single area can be effectively reduced by optimizing a pass system, so that the rolling efficiency of a production line is improved, and the yield of the production line is improved.
(3) According to the rolling process of the large and ultra-large section steel dual-reversible finish rolling area, the BI value of each pass is changed to be small, the spread of a billet is reduced, the BI value of the pass is changed to be smoother, rolled pieces are better gripped, the impact on a rolling mill is reduced, the abrasion of the side wall of the roller can be reduced, the consumption of the roller is reduced, and the times of repairing the roller and changing the roller are reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a layout diagram of a rolling process in a reversible finishing rolling zone for large and ultra-large section steels according to an embodiment of the present invention;
FIG. 2 is a front view of a pass of the blooming mill according to an embodiment of the present invention;
FIG. 3 is a front view of a third rail according to an embodiment of the present invention;
FIG. 4 is a front view of a fourth track according to an embodiment of the present invention;
FIG. 5 is a front view of a fifth rail according to an embodiment of the present invention;
FIG. 6 is a front view of a sixth rail according to an embodiment of the present invention;
FIG. 7 is a front view of a seventh rail according to an embodiment of the present invention;
FIG. 8 is a front view of an eighth rail according to an embodiment of the present invention;
FIG. 9 is a drawing of a rolled HN900X300H steel billet according to an embodiment of the present invention;
fig. 10 is a drawing of a HN900X300 cold-size rolled product according to an embodiment of the present invention.
Description of reference numerals:
1-a rough rolling zone; 11-a cogging mill; 12-a first track; 13-a second track; 2-reversible first finishing zone; 21-a first universal rolling mill; 211-third track; 22-first edging machine; 221-a fourth track; 23-a second universal mill; 231-a fifth track; 3-reversible second finishing zone; 31-a third universal mill; 311-sixth track; 32-second edger; 321-seventh track; 33-a fourth universal mill; 331-eighth track; 4-a rapid roll changing device; 5-a transmission device.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The noun explains:
BI value: the width value of the end part of the roller;
sidewall slope: namely the angle between the vertical surface of the roller and the horizontal line;
and (3) fillet R: refers to that rounded corner of the roll end.
The rolling process of the large and ultra-large steel double reversible finish rolling area comprises a rough rolling area 1, a reversible first finish rolling area 2 and a reversible second finish rolling area 3 which are independently arranged, wherein a billet is heated by a heating furnace and then enters a dephosphorizing machine for dephosphorization, the billet enters the rough rolling area 1, a cogging mill 11 is arranged in the rough rolling area 1, and cogging reversible rolling is carried out at the cogging mill 11; then, the steel billet is transported to a reversible first finish rolling area 2, a first universal rolling mill 21, a first edger 22 and a second universal rolling mill 23 are arranged in parallel in the reversible first finish rolling area 2, and reversible rolling of the first finish rolling area 2 is carried out; and finally, conveying the steel billet to a reversible second finish rolling area 3, and arranging a third universal rolling mill 31, a second edger 32 and a fourth universal rolling mill 33 in parallel in the reversible second finish rolling area 3 to perform reversible rolling in the second finish rolling area 3.
The hole pattern formed between the upper roll and the lower roll forms a rolling track, a rough rolling area 1 and a cogging mill 11 are provided with two rolling tracks which are respectively a first track 12 and a second track 13, a first universal rolling mill 21, a first edging mill 22 and a second universal rolling mill 23 are arranged in parallel in a reversible first finish rolling area 2, and the first universal rolling mill 21, the first edging mill 22 and the second universal rolling mill 23 are respectively provided with one rolling track; a third universal rolling mill 31, a second edger 32 and a fourth universal rolling mill 33 are arranged in parallel in the reversible second finish rolling area 3, and a rolling track is arranged on each of the third universal rolling mill 31, the second edger 32 and the fourth universal rolling mill 33; the BI value of the pass of the rolling track is increased along with the work sequence, the side wall inclination of the pass at two sides of the rolling track is decreased along with the work sequence, and the radius of the fillet R is decreased along with the work sequence (namely the BI value of the track through which the billet passes first is minimum, and the BI value of the track through which the last process passes is maximum).
Rough rolling district 1, reversible first finish rolling district 2 and reversible second finish rolling district 2 all are equipped with transmission 5 and quick roll change device 4 for three region can both carry out quick roll change, but three region roll change simultaneously, can not increase in the roll change time yet. The quick roll changing device 4 is a roll changing device commonly used in the field of steel rolling and belongs to the prior art.
The transmission device 5 is used by matching a transmission machine with a gear base.
And the rough rolling area 1, the reversible first finish rolling area 2 and the reversible second finish rolling area 3 are subjected to end-off rolling without mutual interference.
The first universal rolling mill 21, the second universal rolling mill 23, the third universal rolling mill 31 and the fourth universal rolling mill 33 are identical in model, the first edger 22 and the second edger 32 are identical in model, and the quick roll changing device 4 and spare parts are also identical and convenient to exchange.
When the first reversible finish rolling area is used for rolling, because the rolling temperature is better, large reduction rolling can be performed, the reduction of the subsequent passes is reduced, the energy consumption is reduced, and the roller abrasion is reduced. Therefore, the abrasion of the finished hole in the reversible second finish rolling area can be reduced, and the roll changing frequency of the finished hole is reduced.
Firstly, heating a steel billet by a heating furnace, then, dephosphorization is carried out in a dephosphorization machine, the steel billet enters a rough rolling area 1, and 3 or 5 reciprocating passes of rolling are carried out at a cogging mill 11; then, the steel billet is transported to a reversible first finish rolling area 2, and 3 or 5 reciprocating passes of rolling are carried out in the reversible first finish rolling area 2; and finally, conveying the steel billet to a reversible second finish rolling area 3, and rolling the steel billet in the reversible second finish rolling area 3 for 3 or 5 reciprocating passes to obtain a finished product. On the basis of the original process, a working area is added, so that three steel billets can be rolled on a rolling line at the same time. And when a certain region of the reversible first finish rolling region 2 or the reversible second finish rolling region 3 breaks down, the region can be installed with a replacement roller way to be changed into the original 1+3 production process, so that the whole production line cannot be stopped.
The 1+3+3 arrangement rolling process is characterized in that when small-scale rolling is performed, 3 reciprocating passes of rolling are performed at the cogging mill 11, the reversible first finish rolling zone 2 performs 3 reciprocating passes of rolling (namely, 3 reciprocating passes are performed on the third rail 211 and the fifth rail 231 respectively), and the reversible second finish rolling zone 3 performs 3 reciprocating passes of rolling (namely, 3 reciprocating passes are performed on the sixth rail 311 and the eighth rail 331 respectively); the reason why the rolling pass of the edge rolling mill is not taken into account in the total of 3+2 × 3 — 15 passes (the rolling passes of the first edge rolling mill 22 and the second edge rolling mill 32 are not taken into account) is that the edge rolling mill is used for processing the leg height of the H-shaped steel, which corresponds to the shaping, and the total reduction of the entire H-shaped steel is small, so that the calculation of the pass time is not included. The edge rolling machine is only used when the total rolling pass is not counted.
When a 1+3 arrangement rolling process is used for rolling a small-specification product, 5 reciprocating passes of rolling are required to be performed at a cogging mill, and then 5 reciprocating passes of rolling are performed in a finish rolling area. The total of 5+2 × 5-15 passes (the edger rolling does not account for the rolling passes).
In the 1+3+3 arrangement rolling process, when large-specification rolling is carried out, 5 reciprocating passes of rolling are carried out at the cogging mill 11, 5 reciprocating passes of rolling are carried out in the reversible first finish rolling area 2, and 5 reciprocating passes of rolling are carried out in the reversible second finish rolling area 3. The rolling passes were 5+5 × 2 ═ 25 passes (no rolling passes were counted by the first edger 22 and the second edger 32). For rolling a large-size product by the 1+3 arrangement rolling process, 7-pass rolling is required at a cogging mill), and then 9-pass rolling is required at a reversible second finish rolling zone. The total of 7+2 × 9-25 passes (the edger rolling does not account for rolling passes). Compared with the arrangement of 1+3+3 and the arrangement of 1+3, when the rolling passes are similar, the rolling passes of a single blank in a single area are reduced, which is equivalent to reducing the rolling time of the single blank in the single area, the waiting time of the next blank can be reduced, more steel billets can be rolled in the same time in the single area, and the yield of the production line is improved.
We now describe the 1+3+3 arrangement as an improvement brought about by the novel pass system by means of a large section steel typical specification HN900X 300H-section steel.
The main processing surfaces of the rolled H-shaped steel are the pressing of the waist, the widening of the inner sides of two legs and the pressing of two outer sides.
The BI value of the first track 12 is 776, the sidewall slopes of the groove patterns on both sides of the first track 12 are 105 °, the radius of the fillet R is 55cm, the BI value of the second track 13 is 816, the sidewall slopes of the groove patterns on both sides of the second track 13 are 102 °, and the radius of the fillet R is 40 cm; a third track 211 is arranged on the first universal rolling mill 21, the BI value of the third track 211 is 831.1, the inclination of the side wall of the hole pattern on two sides of the third track 211 is 98 degrees, and the radius of the fillet R is 32 cm; the first edger 22 is provided with a fourth rail 221, the BI value of the fourth rail 221 is 831.1, and two sides of the fourth rail 221 are edging holes; the second universal rolling mill 23 is provided with a fifth track 231, the BI value of the fifth track 231 is 832.8, the inclination of the side wall of the hole pattern on the two sides of the fifth track 231 is 95 degrees, and the radius of the fillet R is 28 cm; a sixth track 311 is arranged on the third universal rolling mill 31, the BI value of the sixth track 311 is 841.4, the inclination of the side wall of the hole pattern on the two sides of the sixth track 311 is 93 degrees, and the radius of the fillet R is 22 cm; the second edger 32 is provided with a seventh rail 321, the BI value of the seventh rail 321 is 841.4, and both sides of the seventh rail 321 are edging holes; an eighth rail 331 is arranged on the fourth universal rolling mill 33, the BI value of the eighth rail 331 is 843.4, the inclination of the side wall of the hole pattern on the two sides of the eighth rail 331 is 90.25 degrees, and the radius of the fillet R is 18 cm; the BI value in the blank of figure 9 is 740mm,
the BI value in the finished product of fig. 10 is 843.4mm, the BI value in the billet minus the BI value in the finished product is 103.4mm (843.4-740 ═ 103.4), which is the size that needs to be expanded when rolling HN900X300H steel.
And the broadening is realized by processing through different hole patterns.
When HN900X300H section steel is rolled, the rough rolling roller can only arrange two rough rolling pass, when 1+3 arrangement technology is adopted, the last frame of the finish rolling area is a finished product hole, the BI value of the roller can only be consistent with that of the finished product, and the finish rolling area is reversible rolling, so that the BI values of the three rolling mills in the finish rolling area are similar in value, and the method is equivalent to processing the blank to the finished product BI value through the spread of the three pass.
When a 1+3+3 layout process is used, the reversible first finishing rolling section 2 is a single reversible section where the roll BI value may be different from the finished product, as shown in fig. 2-8, which corresponds to machining the billet to the finished product BI value by expanding four passes. Therefore, by reducing the expansion of each hole pattern, the blank can be better bitten when entering a new hole pattern, the impact on a rolling mill is reduced, and the risk of roll breakage is reduced. The width of each pass is reduced, so that the abrasion of the side wall of the roller can be reduced, the consumption of the roller is reduced, and the times of repairing the roller and changing the roller are reduced.
In the same way, the inclination of the side wall of the H-shaped steel and the round angle between the legs and the waists are also the inclination and the round angle of the finished product rolled by the inclination of the blank and the round angle, and after a finishing rolling area is added, the change of the inclination and the round angle of each hole pattern during rolling is reduced, so that the change of the inclination and the round angle is smoother, and the change is shown in figures 2 to 8. The same can make the blank get into better bite when new pass, reduce the impact to the rolling mill, reduce the risk of broken roll. The abrasion of the side wall and the round corner of the roller can be reduced, the consumption of the roller is reduced, and the times of repairing the roller and changing the roller are reduced.
Since the number of rough rolling passes is reduced, the temperature of the billet at the time of reaching the first finish rolling zone 2 is high, and since the temperature is high, the metal fluidity of the billet is better, and therefore, rolling with a large rolling reduction can be adopted to reduce the rolling reduction of the reversible second finish rolling zone 3. The temperature of the blank rolled in the reversible second finish rolling area 3 is low, so that greater load is generated on a rolling mill and a motor during rolling, the reduction of the rolling reduction of the area is equivalent to the reduction of the load of the rolling mill and the motor, and the energy consumption can be effectively reduced.
It is known that, when rolling H-section steel, the roll change frequency is the highest for the finished hole rolling mill, and the rolling reduction of the reversible second finishing rolling section is now reduced, reducing the roll wear of the reversible second finishing rolling section 3. Therefore, the roll changing frequency of the finished product hole of the rolling line can be reduced, and the on-line rolling time is prolonged. The side wall inclination of the finished product roller is very small, the turning amount is the largest when the roller is repaired at ordinary times, and the replacement frequency of the finished product hole is reduced and is equal to the turning amount of the finished product hole roller. When the market environment is not good, the demand of products is not so large, and the reversible second finish rolling area 3 can be replaced by a roller way when the market environment is not good, and the rough rolling area 1 and the reversible first finish rolling area 2 are used for rolling. This can reduce throughput and equipment degradation. The main objectives of increasing the production and reducing the cost per ton of steel can therefore be achieved by the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The rolling process of the large and ultra-large section steel in the double reversible finish rolling area is characterized in that: comprises a rough rolling area, a reversible first finish rolling area and a reversible second finish rolling area which are arranged independently,
firstly, heating a steel billet by a heating furnace, then removing phosphorus in a phosphorus removal machine, sending the steel billet to a rough rolling area, arranging a cogging mill in the rough rolling area, and performing cogging reversible rolling at the cogging mill;
then, the steel billet is transported to a reversible first finish rolling area, and a first universal rolling mill, an edge rolling machine I and a second universal rolling mill are arranged in parallel in the reversible first finish rolling area to perform reversible rolling in the first finish rolling area;
and finally, conveying the steel billet to a reversible second finish rolling area, and arranging a third universal rolling mill, a second edger and a fourth universal rolling mill in the reversible second finish rolling area in parallel to perform reversible rolling in the second finish rolling area.
2. The double reversible finish rolling zone rolling process for large and oversized steel sections according to claim 1, characterised in that: the cogging mill is provided with two rolling tracks, the rolling tracks are of a hole-pattern structure formed between the upper roller and the lower roller, and the two rolling tracks are respectively a first track and a second track.
3. The double reversible finish rolling zone rolling process for large and oversized steel sections according to claim 2, characterised in that: the first universal rolling mill, the first edger and the second universal rolling mill are respectively provided with a rolling track, and the times of the reciprocating rolling of the steel billet on the first universal rolling mill and the second universal rolling mill are odd.
4. The large and ultra-large steel bi-reversible finish rolling zone rolling process of claim 3, wherein: and the third universal rolling mill, the second edger and the fourth universal rolling mill are respectively provided with a rolling track, and the times of the reciprocating rolling of the steel billet on the third universal rolling mill and the fourth universal rolling mill are odd times.
5. The large and ultra-large steel bi-reversible finish rolling zone rolling process according to claim 4, characterized in that: the BI value of the pass of the rolling track increases along with the working sequence, the side wall inclination of the pass at two sides of the rolling track decreases along with the working sequence, and the radius of the fillet R decreases along with the working sequence.
6. The double reversible finish rolling zone rolling process for large and oversized steel sections according to claim 1, characterised in that: the rough rolling area, the reversible first finish rolling area and the reversible second finish rolling area are all provided with a transmission device and a quick roll changing device.
7. The double reversible finish rolling zone rolling process for large and oversized steel sections according to claim 1, characterised in that: and the rough rolling area, the reversible first finish rolling area and the reversible second finish rolling area are subjected to end-off rolling.
8. The large and ultra-large steel bi-reversible finish rolling zone rolling process of claim 6, wherein: the first universal rolling mill, the second universal rolling mill, the third universal rolling mill and the fourth universal rolling mill are completely the same in model, the first edge rolling mill and the second edge rolling mill are completely the same in model, and all rolling roll system spare parts and quick-wear part spare parts are also completely the same.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112872027A (en) * | 2020-12-25 | 2021-06-01 | 天津市中重科技工程有限公司 | Novel rolling process for large H-shaped steel |
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