CN110076207B - Production method for reducing folding incidence of edge of wide plate - Google Patents
Production method for reducing folding incidence of edge of wide plate Download PDFInfo
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- CN110076207B CN110076207B CN201910241910.1A CN201910241910A CN110076207B CN 110076207 B CN110076207 B CN 110076207B CN 201910241910 A CN201910241910 A CN 201910241910A CN 110076207 B CN110076207 B CN 110076207B
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/466—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 metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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Abstract
The invention discloses a production method for reducing the folding incidence rate of the edge part of a wide plate, and relates to the technical field of steel material forming and control, wherein a continuous casting blank is drawn by a large-chamfer angle crystallizer, the large-chamfer angle casting blank is subjected to secondary chamfer angle after being discharged from a continuous casting section, the pressure of the secondary chamfer angle is set to be 70-80 bar, and the size of the secondary chamfer angle is 13-15 mm; setting the rolling schedule widening pass single-pass reduction rate to be less than 10%, not performing phosphorus removal operation in the widening process, and performing phosphorus removal operation on the forming pass, the widening pass and the finishing pass; the aspect ratio is more than 1.5 times, the trimming amount of the rolled steel plate is more than or equal to 80mm, and the aspect ratio of all steel grades is less than or equal to 2.0 times; the strength grade of the steel grade is more than 500MPa, the broadening ratio is set to be less than or equal to 1.8 times, the broadening ratio is greater than 1.5 times, and the trimming amount of the rolled steel plate is more than or equal to 100 mm. The invention solves the manufacturing defect of edge folding of the extra-wide steel plate in the production process.
Description
Technical Field
The invention relates to the technical field of steel material forming and control, in particular to a production method for reducing the folding incidence rate of the edge of a wide plate.
Background
The five-meter production line of a wide and thick plate factory mainly produces extra-wide products, because the maximum width of a smelting blank is less than three meters, the rolling process needs to be widened, the edge is used as a right-angle blank to be simply polished when the smelting blank is put into production, the temperature difference exists in the temperature field of the edge in the rolling process, the corner is turned on side to be folded in the rolling process, the widening ratio is larger, the folding distance from the edge is farther, the folding phenomenon is more obvious along with the improvement of the strength of steel, the steel plate degradation is judged due to the incomplete shearing of the edge, and the influence on the yield and contract cashing rate in the production process is great. Technical personnel analyze a product object to determine that in the steel plate rolling widening process, uneven bulging in the thickness direction is caused by uneven deformation and temperature drop of the head and the tail, and the bulging at the side edge is jointed with the surface of the steel plate to form folding in the subsequent longitudinal rolling process, as shown in figure 1, the folding formed by widening remains on the surface of the steel plate and is always in a low-temperature and high-pressure state in the subsequent longitudinal rolling process, and the folding phenomenon is more remarkable.
Disclosure of Invention
In order to solve the technical problems, the invention provides a production method for reducing the folding incidence rate of the edge part of a wide plate, which comprises the following steps:
s1, pulling steel by a large-chamfer 34-degree crystallizer, performing secondary chamfering on the large-chamfer casting blank after the large-chamfer casting blank exits from the continuous casting section, setting the pressure of the secondary chamfering to be 70-80 bar, and setting the size of the secondary chamfering to be 13-15 mm;
s2, setting the rolling regulation widening pass single-pass reduction rate to be less than 10%, not performing phosphorus removal operation in the widening process, and performing phosphorus removal operation in the forming pass, the widening and the finish rolling pass;
s3, widening ratio is larger than 1.5 times, the edge cutting amount of the rolled steel plate is larger than or equal to 80mm, and the widening ratio of all steel grades is smaller than or equal to 2.0 times; the strength grade of the steel grade is more than 500MPa, the broadening ratio is set to be less than or equal to 1.8 times, the broadening ratio is greater than 1.5 times, and the trimming amount of the rolled steel plate is more than or equal to 100 mm.
The technical effects are as follows: the invention solves the manufacturing defect of edge folding in the production process of an extra-wide steel plate, and provides a production method for solving the edge folding defect in the forming process of ferrous metallurgy materials.
The technical scheme of the invention is further defined as follows:
the production method for reducing the incidence of edge folding of the wide plate is as described above, and comprises the steps of structural steel plate S355J, blank size: 260X 2070X 2792 mm; order size: 25X 3910X 12000 mm;
the rolling mode is as follows: longitudinal-lateral-longitudinal; the aspect ratio is as follows: 1.88; the continuous casting blank is drawn by a large-chamfer 34-degree crystallizer, secondary chamfering is carried out after the blank is discharged from a continuous casting section, the chamfer pressure is 70bar, and the chamfer size is 15 mm; the rolling process comprises the first step of forming rolling, widening rolling is carried out after forming is finished, the widening is carried out for four times, the reduction ratios are respectively 8%, 9%, 8% and 8%, full longitudinal rolling is carried out after widening is finished, and phosphorus removal is carried out for the first, fifth and sixth times respectively;
pre-straightening after rolling, carrying out ultra-fast cooling, and straightening the steel plate to below 300 ℃ after the steel plate reaches a cooling bed;
after straightening, trimming, cutting 40mm at two sides, and cutting to length;
and (4) marking, inspecting the surface and detecting the flaw of the steel plate after shearing, and then warehousing.
The production method for reducing the folding incidence rate of the edge of the wide plate comprises the following steps of high-strength steel Q690, blank size: 260X 2570X 2792 mm; order size: 25X 4210X 12000 mm;
the rolling mode is as follows: longitudinal-lateral-longitudinal; the aspect ratio is as follows: 1.63; the continuous casting blank is drawn by a large-chamfer 34-degree crystallizer, secondary chamfering is carried out after the blank is discharged from a continuous casting section, the chamfering pressure is 80bar, and the chamfering size is 13 mm; the rolling process comprises the first step of forming rolling, widening rolling is carried out after forming is finished, the widening is carried out for four times, the reduction ratios are respectively 9%, 8% and 8%, full longitudinal rolling is carried out after widening is finished, and phosphorus removal is carried out for the first, fifth and sixth times respectively;
pre-straightening after rolling, carrying out ultra-fast cooling, and straightening the steel plate to below 300 ℃ after the steel plate reaches a cooling bed;
after straightening, trimming, cutting 50mm at both sides, and cutting to length;
and (4) marking, inspecting the surface and detecting the flaw of the steel plate after shearing, and then warehousing.
The invention has the beneficial effects that:
(1) the invention sets a secondary chamfering process, effectively improves the edge temperature field in the rolling process by using a secondary chamfering method, eliminates edge folding from the source, reduces the blank amount of edge grinding, reduces the labor cost, saves the production time, improves the production efficiency, has more standard blank appearance and more uniform edge thickness of a rolled finished product;
(2) the invention standardizes the rolling widening process and stabilizes the edge quality of the extra-wide product;
(3) the method standardizes the trimming amount of the broadened steel plates, particularly standardizes the division of steel grades in strength level, effectively improves the yield of products, and reduces the average edge shearing amount by 10 mm.
Drawings
FIG. 1 is a diagram of the secondary chamfer blank morphology of the present invention;
fig. 2 is a straight fold that the present invention needs to address.
Detailed Description
Example 1
In the production method for reducing the occurrence rate of the edge folding of the wide plate provided by the embodiment, the structural steel plate S355J comprises the following blank size: 260X 2070X 2792 mm; order size: 25X 3910X 12000 mm;
the rolling mode is as follows: longitudinal-lateral-longitudinal; the aspect ratio is as follows: 1.88; the continuous casting blank is drawn by a large-chamfer 34-degree crystallizer, so that the two-dimensional cooling of a right-angle blank is effectively weakened, the temperature uniformity and the strain resistance of the corner are improved, the blank is subjected to secondary chamfering after being discharged from a continuous casting section, the chamfering pressure is 70bar, and the chamfering size is 15mm, as shown in figure 2; the rolling process comprises the first step of forming rolling, widening rolling is carried out after forming is finished, the widening is carried out for four times, the reduction ratios are respectively 8%, 9%, 8% and 8%, full longitudinal rolling is carried out after widening is finished, and phosphorus removal is carried out for the first, fifth and sixth times respectively;
pre-straightening after rolling, carrying out ultra-fast cooling, and straightening the steel plate to below 300 ℃ after the steel plate reaches a cooling bed;
after straightening, trimming, cutting 40mm at two sides, and cutting to length;
and (4) marking, inspecting the surface and detecting the flaw of the steel plate after shearing, and then warehousing.
After the method is adopted, the folding incidence rate of the steel grade with the same specification is reduced from 0.9% to 0.3%, the judging rate is reduced from 0.31% to 0.03%, and the cost-reducing and gain-increasing effect is obvious.
Example 2
The production method for reducing the folding incidence rate of the edge of the wide plate provided by the embodiment comprises the following steps of high-strength steel Q690, blank size: 260X 2570X 2792 mm; order size: 25X 4210X 12000 mm;
the rolling mode is as follows: longitudinal-lateral-longitudinal; the aspect ratio is as follows: 1.63; the continuous casting blank is drawn by a large-chamfer 34-degree crystallizer, so that the two-dimensional cooling of a right-angle blank is effectively weakened, the temperature uniformity and the strain resistance of the corner are improved, the blank is subjected to secondary chamfering after exiting from a continuous casting section, the chamfering pressure is 80bar, and the chamfering size is 13 mm; the rolling process comprises the first step of forming rolling, widening rolling is carried out after forming is finished, the widening is carried out for four times, the reduction ratios are respectively 9%, 8% and 8%, full longitudinal rolling is carried out after widening is finished, and phosphorus removal is carried out for the first, fifth and sixth times respectively;
pre-straightening after rolling, carrying out ultra-fast cooling, and straightening the steel plate to below 300 ℃ after the steel plate reaches a cooling bed;
after straightening, trimming, cutting 50mm at both sides, and cutting to length;
and (4) marking, inspecting the surface and detecting the flaw of the steel plate after shearing, and then warehousing.
After the method is adopted, the folding incidence rate of the steel grade with the same specification is reduced by 0.36 percent from 1.21 percent, the judging rate is reduced to 0.08 percent from 0.41 percent, and the cost-reducing and gain-increasing effect is obvious.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (3)
1. A production method for reducing the folding incidence of the edge part of a wide plate is characterized in that:
s1, pulling steel by a large-chamfer 34-degree crystallizer, performing secondary chamfering on the large-chamfer casting blank after the large-chamfer casting blank exits from the continuous casting section, setting the pressure of the secondary chamfering to be 70-80 bar, and setting the size of the secondary chamfering to be 13-15 mm;
s2, setting the rolling procedure widening pass single-pass reduction rate to be less than 10%, not performing descaling operation in the widening process, and performing descaling operation on the forming pass, the widening and the finish rolling pass;
s3, widening ratio is larger than 1.5 times, the edge cutting amount of the rolled steel plate is larger than or equal to 80mm, and the widening ratio of all steel grades is smaller than or equal to 2.0 times; the strength grade of the steel grade is more than 500MPa, the broadening ratio is set to be less than or equal to 1.8 times, the broadening ratio is greater than 1.5 times, and the trimming amount of the rolled steel plate is more than or equal to 100 mm.
2. A method of manufacturing a reduced incidence of edge folding in wide panels as claimed in claim 1, wherein:
structural steel plate S355J, blank size: 260X 2070X 2792 mm; order size: 25X 3910X 12000 mm;
the rolling mode is as follows: longitudinal-lateral-longitudinal; the aspect ratio is as follows: 1.88; the continuous casting blank is drawn by a large-chamfer 34-degree crystallizer, secondary chamfering is carried out after the blank is discharged from a continuous casting section, the chamfer pressure is 70bar, and the chamfer size is 15 mm; the rolling process comprises the first step of forming rolling, widening rolling is carried out after forming is finished, widening is carried out for four times, the reduction ratios are 8%, 9%, 8% and 8%, full longitudinal rolling is carried out after widening is finished, and descaling is carried out for the first, fifth and sixth times;
pre-straightening after rolling, carrying out ultra-fast cooling, and straightening the steel plate to below 300 ℃ after the steel plate reaches a cooling bed;
after straightening, trimming, cutting 40mm at two sides, and cutting to length;
and (4) marking, inspecting the surface and detecting the flaw of the steel plate after shearing, and then warehousing.
3. A method of manufacturing a reduced incidence of edge folding in wide panels as claimed in claim 1, wherein:
high strength steel Q690, blank size: 260X 2570X 2792 mm; order size: 25X 4210X 12000 mm;
the rolling mode is as follows: longitudinal-lateral-longitudinal; the aspect ratio is as follows: 1.63; the continuous casting blank is drawn by a large-chamfer 34-degree crystallizer, secondary chamfering is carried out after the blank is discharged from a continuous casting section, the chamfering pressure is 80bar, and the chamfering size is 13 mm; the rolling process comprises the first step of forming rolling, widening rolling is carried out after forming is finished, the widening is carried out for four times, the reduction ratios are respectively 9%, 8% and 8%, full longitudinal rolling is carried out after widening is finished, and descaling is carried out for the first, fifth and sixth times respectively;
pre-straightening after rolling, carrying out ultra-fast cooling, and straightening the steel plate to below 300 ℃ after the steel plate reaches a cooling bed;
after straightening, trimming, cutting 50mm at both sides, and cutting to length;
and (4) marking, inspecting the surface and detecting the flaw of the steel plate after shearing, and then warehousing.
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| CN201910241910.1A CN110076207B (en) | 2019-03-28 | 2019-03-28 | Production method for reducing folding incidence of edge of wide plate |
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| CN201910241910.1A CN110076207B (en) | 2019-03-28 | 2019-03-28 | Production method for reducing folding incidence of edge of wide plate |
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| CN112474801B (en) * | 2020-11-09 | 2022-05-17 | 江苏省沙钢钢铁研究院有限公司 | Wide and thick plate with small trimming loss and production method thereof |
| CN112893467B (en) * | 2021-01-14 | 2022-08-16 | 山东钢铁集团日照有限公司 | Method for controlling edge folding of wide and thick steel plate |
| CN113102502B (en) * | 2021-02-26 | 2023-03-24 | 舞阳钢铁有限责任公司 | Production method for hot rolling delivery steel plate with high surface quality |
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| CN102441584B (en) * | 2011-12-10 | 2014-03-26 | 西部钛业有限责任公司 | Preparation method of thick slab of chamfer titanium alloy |
| CN102642000A (en) * | 2012-05-08 | 2012-08-22 | 首钢总公司 | Slab continuous casting chamfer crystallizer narrow-face copper plate capable of effectively controlling longitudinal cracks of corners |
| CN204975250U (en) * | 2015-09-21 | 2016-01-20 | 舞阳钢铁有限责任公司 | To chamfer continuous casting billet bight carrying out smooth equipment |
| CN106734370B (en) * | 2015-11-19 | 2019-02-26 | 鞍钢股份有限公司 | A method of prevent wide specification steel plate edge from generating folding |
| CN107795531A (en) * | 2017-11-13 | 2018-03-13 | 邯郸钢铁集团有限责任公司 | A kind of system and its application method for keeping the secondary pressure angle stability hydraulic of chamfering slab |
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