CN113333465A - Rolling method for rolling sector plate by blooming mill and hole pattern system used by same - Google Patents
Rolling method for rolling sector plate by blooming mill and hole pattern system used by same Download PDFInfo
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- CN113333465A CN113333465A CN202110653942.XA CN202110653942A CN113333465A CN 113333465 A CN113333465 A CN 113333465A CN 202110653942 A CN202110653942 A CN 202110653942A CN 113333465 A CN113333465 A CN 113333465A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 claims description 44
- 238000003892 spreading Methods 0.000 claims description 19
- 230000007480 spreading Effects 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 16
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010583 slow cooling Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000005242 forging Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
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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
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
-
- 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
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- 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
- B21B37/24—Automatic variation of thickness according to a predetermined programme
- B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
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Abstract
The invention relates to a rolling method for rolling a sector plate by a blooming mill and a hole pattern system used by the same, belonging to the technical field of sector plate preparation. The invention provides a pass system for rolling a sector plate by a blooming mill, which aims to solve the problems of high production cost and low efficiency of the existing sector plate production process and comprises a first pass, a second pass, a third pass and a fourth pass, wherein the second pass is used for preparing material types for uneven deformation rolling passes, the third pass is used for uneven deformation rolling passes, and the fourth pass is a finished product hole with even deformation. The hole pattern system provided by the invention can ensure the precision of section size in the deformation process of a continuous casting blank rolling sector plate, and the rolling deformation process established by matching with the deformation characteristics of a rolled piece ensures the stability and the internal quality of the product in the deformation process of the rolled piece, effectively reduces the production cost of the sector plate, improves the production efficiency and the product competitiveness, and produces the sector plate suitable for the cold-rolled sheet curling.
Description
Technical Field
The invention belongs to the technical field of sector plate preparation, and particularly relates to a rolling method for rolling a sector plate by a blooming mill and a hole pattern system used by the same.
Background
The sector plate is a collection tool for curling the rolled sheet. At present, the sector plates are produced by casting or forging. The cast sector plate not only has high production cost, but also has influence on the environment. By adopting the forging production mode, the forged blank has large size and large metal turning amount, and the problems of high production cost and low production efficiency exist. How to reduce the production cost of the sector plate and improve the production efficiency on the premise of ensuring the quality of the sector plate is a problem which needs to be solved urgently in the field.
Disclosure of Invention
The invention provides a rolling method for rolling a sector plate by a blooming mill and a hole pattern system used by the same, aiming at solving the problems of high production cost and low efficiency of the existing sector plate production process.
The technical scheme of the invention is as follows:
the invention provides a pass system for rolling a sector plate by a blooming mill, which comprises a first pass, a second pass, a third pass and a fourth pass, wherein the first pass and the second pass are both box-shaped passes, the second pass is used for preparing material types for uneven deformation rolling passes, the third pass is used for uneven deformation rolling passes, and the fourth pass is a finished hole for the even deformation rolling passes; width B of the second hole pattern2Third pass width B3Δ b the spread of the product; the width B of the third hole pattern3Width of fourth pass B4Δ b the amount of spread of the rolled stock.
Further, the height h of the side wall of the third hole type3And groove depth H3Determined by the dimensions of the finished product, the difference H3-h3The condition requirement of uniform deformation of a fourth hole pattern is met; corner radian R of third pass3Corner radian R of fourth hole type4Equal; the chamfer dimension r of the third hole type1＝R1。
Further, the width b of the bottom plane of the groove with the third hole type3Is the width B of the third hole pattern30.37 times of.
Further, the slope a of the side wall of the second hole type2≤11(iv) DEG; the side wall inclination a of the third hole type3Less than or equal to 11 degrees; the side wall inclination a of the fourth hole type4≤7°。
A continuous casting slab is heated to the initial rolling temperature and then enters a first pass for rolling, the continuous casting slab is rolled in the first pass after being rolled for 1-2 times, turned over for 90 degrees, continuously rolled for 3-6 times, turned over for 90 degrees and then enters a second pass, rolled for 7-8 times in the second pass, turned over for 90 degrees and then enters a third pass, rolled for 9-12 times in the third pass, turned over for 90 degrees and then enters a second pass, rolled for 13 times in the second pass, turned over for 90 degrees and then enters a third pass, rolled for 14-15 times in the third pass, then enters a fourth pass, and rolled for 16-17 times in the fourth pass, so that the sector plate is obtained.
Further, the rolling temperature is 1220-1240 ℃.
Furthermore, in the process of rolling in the first pass, the reduction of the 1 st pass to the 5 th pass is 40mm, and the reduction of the 6 th pass is 30 mm; the spreading of the 1 st pass is 0mm, and the spreading of the 2 nd to 6 th passes is 10 mm.
Further, in the process of rolling in the second pass, the reduction of the 7 th pass is 30, and the spread is 10; the rolling reduction of the 8 th pass is 50mm, and the spreading amount is 15 mm; the rolling reduction in the 13 th pass was 25mm, and the spreading was 0 mm.
Further, in the process of rolling in the third pass, the rolling reduction of 9 th and 10 th passes is 30mm, and the spreading amount is 5 mm; the rolling reduction of the 11 th pass is 40mm, and the spreading amount is 5 mm; the rolling reduction of the 12 th pass is 40mm, and the spreading amount is 10 mm; the rolling reduction of the 14 th pass is 40mm, and the broadening amount is 10 mm; the rolling reduction in the 15 th pass was 30mm, and the spreading was 5 mm.
Further, in the process of rolling in the fourth pass, the rolling reduction of the 16 th pass is 25mm, and the spreading amount is 8 mm; the rolling reduction in the 17 th pass was 30mm, and the spreading was 11 mm.
The invention has the beneficial effects that:
according to the invention, the pass system is designed according to the deformation characteristics of different rolling passes in the process of rolling the sector plate by the blooming mill and the specific size of the sector plate, so that the accuracy of the section size in the deformation process of rolling the sector plate by the continuous casting billet can be ensured. The pass system provided by the invention is matched with a rolling deformation process formulated according to the deformation characteristics of the rolled piece, the rolling reduction is uniformly distributed in the non-uniform deformation rolling process, the rolled piece is ensured not to be twisted, and the core part quality of the product is improved by adopting single-pass large-reduction rolling in the uniform deformation rolling process.
The invention saves smelting and casting processes and solves the problem of environmental pollution caused by the production of the sector plate by adopting a casting mode. The sector plate is prepared by adopting a production mode of a primary rolling mill, so that the stability of a rolled piece in the deformation process and the internal quality of a product are ensured, the production cost of the sector plate is effectively reduced, the production efficiency and the product competitiveness are improved, the sector plate suitable for cold-rolled sheet curling is produced, and the large-scale production is favorably realized.
Drawings
FIG. 1 is a schematic structural view of a pass system for rolling sector plates by a blooming mill according to the present invention;
FIG. 2 is a schematic structural view of the first pass in the pass system for rolling sector plates by the blooming mill provided by the present invention;
FIG. 3 is a schematic structural view of the second pass in the pass system for rolling sector plates by the blooming mill provided by the present invention;
FIG. 4 is a schematic structural view of the third pass in the pass system for rolling sector plates by the blooming mill provided by the present invention;
FIG. 5 is a schematic structural view of the fourth pass in the pass system for rolling sector plates by the blooming mill according to the present invention;
fig. 6 is a schematic structural diagram of a hole pattern system designed in example 5.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention. The process equipment or apparatus not specifically mentioned in the following examples are conventional in the art, and if not specifically mentioned, the raw materials and the like used in the examples of the present invention are commercially available; unless otherwise specified, the technical means used in the examples of the present invention are conventional means well known to those skilled in the art.
Example 1
The embodiment provides a pass system for a blooming mill to roll sector plates, and the pass system comprises a first pass 1, a second pass 2, a third pass 3 and a fourth pass 4.
As shown in fig. 1, the first pass 1 and the second pass 2 are both box-type passes. Because the section size of raw materials required for producing the sector plate is large, the primary rolling mill has more rolling passes in the shuttle rolling process, and in order to meet the requirement of rolling piece widening in the rolling process, a box type hole pattern with large width size and shallow groove carving of a rolling groove is required to be selected when a first hole pattern is designed, and the structural sizes B1, H1, H1, a1 and R, r of the first hole pattern are carried out according to the design mode of a normal box type hole pattern.
The second pass 2 is used for material shape preparation for uneven deformation rolling passes, the dimensional accuracy of the rolled section is high, the dimensional difference between two diagonal lines is strict, and certain relevance is provided with the third pass width B3. Thus, the width B of the second pass2Third pass width B3Δ b the amount of spread of the rolled stock.
The third pass 3 is used for the uneven deformation rolling pass, and the condition of even deformation is provided for the next pass of finished pass through the uneven rolling deformation of the pass.
In order to ensure the rolling stability of the rolled piece in the uneven deformation process, the width of the rolled piece rolled by the second pass is larger than the width B of the third pass3About 20mm smaller, and simultaneously, the expansion amount of rolled pieces in the fourth pass is also considered, so the width B of the third pass3Width of fourth pass B4Δ b the amount of spread of the rolled stock.
The third hole pattern completes the uneven deformation processTherefore, the fourth pass 4 is a finished hole with uniform deformation pass, and has the condition of uniform deformation, and the height h of the side wall dimension of the finished hole is4Pass and groove height H4Arc R of groove bottom4Designed according to the required size of the product, the width of the hole pattern B4Width B of the third pass according to the formula3Width of fourth pass B4And calculating the width of the rolled piece delta b.
Example 2
In order to ensure the condition of providing uniform deformation for the next pass of the finish pass rolling, the present embodiment further requires the height h of the side wall of the third pass on the basis of the embodiment 13And groove depth H3Is determined by the finished product size, the difference H3-h3The condition requirement of uniform deformation of a fourth hole pattern is met; while the radian R of the corner of the third pass3Corner radian R of fourth hole type4Are equal.
Example 3
In order to ensure that the accurate width dimension of a rolled piece is provided for the next pass of finished pass rolling, the rolled piece needs to be turned by 90 degrees for one pass of rolling in the rolling process so as to ensure the width dimension precision of the rolled piece. In order to ensure stable rolling after the rolled piece is turned over, in this embodiment, on the basis of embodiment 1 or 2, it is further required to design a plane at the bottom of the groove of the third pass to ensure the support of the first rolled piece of the rolling mill push bench, and the width b of the plane at the bottom of the groove of the third pass is3Is the width B of the third hole pattern30.37 times of.
In the embodiment, a design method for transition by using the third pass with the bottom of the plane rolling groove is adopted, so that the problem of control precision of the width size of a product is effectively solved, conditions are provided for uniform deformation rolling of the finished pass of the fourth pass, and stable rolling in the production process of the product is realized.
Example 4
In this embodiment, requirements for the chamfer size and the sidewall slope of the hole pattern system are further made on the basis of embodiments 1, 2 or 3.
The chamfer sizes R1, R1 and R2 of the third hole pattern are determined according to the requirements of practical situations, such as: r2 is a better transition of the size of the next circular arc, and the selected chamfer size is larger; r1 is selected to be smaller in order to meet the requirement of better transition of the R5 of the smaller hole type of the next finished product; the chamfer dimension R1 of the third pass in design and the chamfer dimension R1 are selected to be the same chamfer.
When designing the second pass, in order to ensure the accuracy of the section size, the side wall inclination a of the second pass2Selected to be within 11 deg..
In order to ensure that the rolled piece does not twist in the deformation process of the third pass and the fourth pass, the design angle of the inclination of the side wall of the hole type is not easy to be too large on the premise of meeting the width expansion amount of the rolled piece, so that the third pass a3The fourth pass a is selected within 11 DEG4The angle is selected within 7 degrees, so that the rolled piece is guaranteed to have a good supporting effect and a sufficient widening space.
Example 5
In this embodiment, for the deformation characteristics of the cross-sectional shape of the R310 × 460 sector plate in different rolling passes, the pass system for rolling the sector plate in the blooming mill is designed according to the design considerations of the pass system provided in embodiments 1 to 4, and the specific structure and dimensions of the pass system are shown in fig. 6.
Example 6
This example provides a rolling method for rolling R310 × 460 sector plates by a blooming mill based on the pass system designed and manufactured in example 5.
The preparation raw materials of the sector plate are phi 550mm and 42CrMo steel type large-circle continuous casting billet, wherein the 42CrMo large-circle continuous casting billet comprises the following components in percentage by weight: c: 0.40 to 0.45; cr: 0.9 to 1.20; mn: 0.60 to 0.90; mo: 0.20 to 0.30; p is less than or equal to 0.025; s: 0.02-0.035; si: 0.15 to 0.40; ni: less than or equal to 0.25; cu: less than or equal to 0.25; al: 0.02-0.035; sn: less than or equal to 0.030; v: less than or equal to 0.06; ti: less than or equal to 0.02.
In order to ensure the stability in the deformation process and the internal quality of a product, a rolled piece is required to have better deformation conditions, so that the initial rolling temperature of the product on the rolled piece is required to be 1220-1240 ℃, and the single-pass high-reduction rolling condition is ensured.
The large round continuous casting billet adopts a stepping continuous heating furnace, the temperature of a preheating section is less than or equal to 860 ℃, the temperature of a heating section is 1000-1100 ℃, the temperature of a heating section is 1240-1260 ℃, the total heating time is 10 hours, and the initial rolling temperature is 1220-1240 ℃.
The blooming mill is a 850 blooming mill, and the specific rolling pass deformation process is as follows:
the height of a continuous casting billet rolled piece is 550mm, the width of the rolled piece is 550mm, and the continuous casting billet rolled piece enters a first pass for rolling:
the 1 st pass reduction is 40mm, the height of the deformed rolled piece is 510mm, and the width of the deformed rolled piece is 550 mm;
the 2 nd pass reduction is 40mm, the width expansion is 10mm, and the height of the deformed rolled piece is 470mm and the width of the deformed rolled piece is 560 mm;
turning the steel for 90 degrees,
the 3 rd pass reduction is 40mm, the width expansion is 10mm, and the height of the deformed rolled piece is 520mm and the width of the deformed rolled piece is 480 mm;
the 4 th pass reduction is 40mm, the width expansion is 10mm, and the height of the deformed rolled piece is 480mm and the width of the deformed rolled piece is 490 mm;
the 5 th pass reduction is 40mm, the width expansion is 10mm, and the height of the deformed rolled piece is 440mm and the width of the deformed rolled piece is 500 mm;
the 6 th pass reduction is 30mm, the width expansion is 10mm, and the height of the deformed rolled piece is 410mm and the width of the deformed rolled piece is 510 mm;
turning over the steel by 90 degrees, and rolling in a second pass:
the 7 th pass reduction is 30mm, the width expansion is 10mm, and the height of the deformed rolled piece is 480mm and the width of the deformed rolled piece is 420 mm;
the rolling reduction of the 8 th pass is 50mm, the spreading amount is 15mm, and the height of the deformed rolled piece is 430mm and the width of the deformed rolled piece is 435 mm;
turning over the steel by 90 degrees, and rolling in a third pass:
the 9 th pass reduction is 30mm, the width expansion is 5mm, and the height of the deformed rolled piece is 435mm and the width of the deformed rolled piece is 435 mm;
the 10 th pass reduction is 30mm, the width expansion is 5mm, and the height of the deformed rolled piece is 435mm and the width of the deformed rolled piece is 440 mm;
the 11 th pass reduction is 40mm, the width expansion is 5mm, and the height of the deformed rolled piece is 435mm and the width of the deformed rolled piece is 445 mm;
the 12 th pass reduction is 40mm, the width expansion is 10mm, and the height of the deformed rolled piece is 420mm and the width of the deformed rolled piece is 455 mm;
turning over the steel by 90 degrees, and rolling in a second pass:
the 13 th pass reduction is 25mm, the width expansion is 0mm, and the height of the deformed rolled piece is 430mm and the width of the deformed rolled piece is 420 mm;
turning over the steel by 90 degrees, and rolling in a third pass:
the 14 th pass reduction is 40mm, the width expansion is 10mm, and the height of the deformed rolled piece is 380mm and the width of the deformed rolled piece is 440 mm;
the 15 th pass reduction is 30mm, the width expansion is 5mm, and the height of the deformed rolled piece is 350mm and the width of the deformed rolled piece is 445 mm;
and (3) rolling in a fourth pass:
the 16 th pass reduction is 25mm, the width expansion is 8mm, and the height of the deformed rolled piece is 325mm and the width of the deformed rolled piece is 453 mm;
the 17 th pass reduction is 30mm, the width expansion is 11mm, and the height of the deformed rolled piece is 295mm and the width of the deformed rolled piece is 464 mm;
the rolled product needs to enter a slow cooling pit for slow cooling, the temperature of the product entering the slow cooling pit is required to be more than or equal to 550 ℃, and the slow cooling time is 60 hours.
Claims (10)
1. The pass system for rolling the sector plate by the blooming mill is characterized by comprising a first pass (1), a second pass (2), a third pass (3) and a fourth pass (4), wherein the first pass (1) and the second pass (2) are both box-shaped passes, the second pass (2) is used for preparing material types for uneven deformation rolling passes, the third pass (3) is used for uneven deformation rolling passes, and the fourth pass (4) is a finished hole for even deformation rolling passes; width B of the second hole pattern2Third pass width B3Δ b the spread of the product; the width B of the third hole pattern3Width of fourth pass B4Δ b the amount of spread of the rolled stock.
2. Pass system for blooming mill rolling sector plates, according to claim 1, characterized in that the side wall height h of the third pass is3And groove depth H3Determined by the dimensions of the finished product, the difference H3-h3The condition requirement of uniform deformation of a fourth hole pattern is met; corner radian R of third pass3Corner radian R of fourth hole type4Equal; the chamfer dimension r of the third hole type1＝R1。
3. Pass system for blooming mill sector plates according to claim 1 or 2, characterised in that the groove bottom plane width b of the third pass is3Is the width B of the third hole pattern30.37 times of.
4. Pass system for blooming mill rolling sector plates, according to claim 3, characterized in that the side wall slope a of the second pass is2Less than or equal to 11 degrees; the side wall inclination a of the third hole type3Less than or equal to 11 degrees; the side wall inclination a of the fourth hole type4≤7°。
5. A method of rolling sector plates in a blooming mill using a pass system as claimed in any one of claims 1 to 4, it is characterized in that the continuous casting blank is heated to the initial rolling temperature and then enters a first pass for rolling, turning the steel 90 degrees after rolling the first pass to the second pass and turning the steel 90 degrees after rolling the second pass to the third pass after rolling the second pass to the third pass, turning the steel for 90 degrees after rolling 7 th to 8 th pass in the second pass and entering a third pass, turning the steel for 90 degrees after rolling for 9-12 times in the third pass and entering the second pass, turning the steel by 90 degrees after rolling in the second pass for 13 th, entering a third pass, rolling in the third pass for 14 th to 15 th, entering a fourth pass, and finishing rolling in the 16 th to 17 th passes of rolling in the fourth pass to obtain the sector plate.
6. A method as claimed in claim 5, wherein said rolling temperature is 1220 to 1240 ℃.
7. A method as claimed in claim 5 or 6, wherein during rolling in pass number one, the reduction of pass number 1 to 5 is 40mm and the reduction of pass number 6 is 30 mm; the spreading of the 1 st pass is 0mm, and the spreading of the 2 nd to 6 th passes is 10 mm.
8. The method of rolling a sector plate by a blooming mill as claimed in claim 7, wherein in the rolling in pass number two, the reduction at pass number 7 is 30mm and the spread is 10 mm; the rolling reduction of the 8 th pass is 50mm, and the spreading amount is 15 mm; the rolling reduction in the 13 th pass was 25mm, and the spreading was 0 mm.
9. The method as claimed in claim 8, wherein the rolling reduction in the third pass is 30mm and the rolling reduction in the third pass is 5mm in both the 9 th and 10 th passes; the rolling reduction of the 11 th pass is 40mm, and the spreading amount is 5 mm; the rolling reduction of the 12 th pass is 40mm, and the spreading amount is 10 mm; the rolling reduction of the 14 th pass is 40mm, and the broadening amount is 10 mm; the rolling reduction in the 15 th pass was 30mm, and the spreading was 5 mm.
10. The method of rolling a sector plate by a blooming mill as claimed in claim 9, wherein in the rolling in pass number four, the rolling reduction in pass number 16 is 25mm and the rolling reduction in width is 8 mm; the rolling reduction in the 17 th pass was 30mm, and the spreading was 11 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749480A (en) * | 2022-04-19 | 2022-07-15 | 建龙北满特殊钢有限责任公司 | Rolling method of cold rolling coiler sector plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749480A (en) * | 2022-04-19 | 2022-07-15 | 建龙北满特殊钢有限责任公司 | Rolling method of cold rolling coiler sector plate |
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Application publication date: 20210903 |