A rolling method for improving the yield rate of extra-wide and extra-thick steel plates

Abstract

The application discloses a rolling method for improving the yield of a special wide and thick steel plate, and the thickness of the steel plate ranges from 130 mm to 150 mm, and the width ranges from 3400 mm to 3500 mm; the steel plate is rolled by using a reversible four-roller rolling mill and a vertical roller mill; and the specific operation is as follows: after the blank is discharged from a heating furnace, the reversible four-roller rolling mill is used for longitudinal shaping rolling; after the longitudinal shaping is completed, transverse shaping rolling is carried out; after the longitudinal and transverse shaping rolling of the steel plate is completed, the blank is alternately subjected to width expansion rolling and edge extrusion rolling; and after the edge is flattened, longitudinal finished product rolling is carried out. The rolling method can obviously reduce the edge concave degree, and the cutting edge amount is reduced by 200-250 mm; the production and manufacturing process is simple, the product quality is stable, and batch production can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a rolling method for improving the yield rate of extra-wide and extra-thick steel plates. Background Art

[0002] The rolling of extra-wide and extra-thick steel plates is difficult, the concave edges are large after rolling, the amount of steel plate trimming is large, and the yield rate is low; after improving the yield rate, the input of raw materials for steel plates is reduced. Under the premise of ensuring the quality of steel plates, the cost per ton of steel is significantly reduced, which is an important way for steel companies to make profits.

[0003] Rolling extra-wide and extra-thick steel plates is difficult. During the production process, the steel plates are expanded to the burr width of the finished plate in one go. Because the rolling force cannot effectively penetrate the core, the deformation of the rolled steel plates in the thickness direction is extremely uneven, resulting in a large amount of concave edges on the steel plates. This large amount of concave edges significantly increases the amount of trimming required when the steel plates are cut into finished products. Therefore, the present invention combines existing equipment in the production plant and utilizes multiple edge extrusions to reduce the amount of concave edges on the steel plates, thereby increasing the yield rate of the steel plates, reducing production costs, and improving the economic benefits of the enterprise. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a rolling method for improving the yield rate of extra-wide and extra-thick steel plates, wherein the extra-wide and extra-thick steel plates have a thickness range of 130-150 mm and a width range of 3400-3500 mm.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A rolling method for improving the yield rate of extra-wide and extra-thick steel plates utilizes a reversible four-roll mill and a vertical roller mill for rolling. The specific operation is as follows: after the billet leaves the heating furnace, it is subjected to longitudinal shaping rolling using the reversible four-roll mill. After the longitudinal shaping is completed, it is subjected to transverse shaping rolling. After the longitudinal and transverse shaping rolling of the steel plate are completed, the billet is alternately subjected to widening rolling and edge extrusion rolling. After the edges are flattened, it is subjected to longitudinal finished product rolling.

[0007] Furthermore, the steel plate shaping and rolling width of the present invention is 2000-2100 mm.

[0008] Furthermore, the widening of the present invention is carried out in three stages.

[0009] Furthermore, the first widening width of the steel plate of the present invention is 2600-2700 mm, the widening ratio is 1.24-1.35%, and the edge extrusion amount of the vertical roller is 20-25 mm.

[0010] Furthermore, the second widening width of the steel plate of the present invention is 3100-3200 mm, the widening ratio is 1.15-1.23%, and the edge extrusion amount of the vertical roller is 20-25 mm.

[0011] Furthermore, the third widening width of the steel plate of the present invention is 3550-3650 mm, the widening ratio is 1.10-1.18%, and the edge extrusion amount of the vertical roller is 15-20 mm.

[0012] The concave edge depth of the steel plate produced by the method of the present invention is significantly reduced, and the edge trimming amount of the steel plate is reduced by 200-250mm.

[0013] The beneficial effects of adopting the above technical solution are: 1. By utilizing multiple edge extrusions, the amount of concave edge of the steel plate is reduced, the yield rate of the steel plate is increased, production costs are reduced, and the economic benefits of the enterprise are improved. 2. This method is simple to operate. The above production method only innovates the production process and does not increase equipment investment, so the production cost is relatively low. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to specific embodiments.

[0015] A rolling method for improving the yield rate of extra-wide and extra-thick steel plates utilizes a reversible four-roll mill and a vertical roller mill for rolling. The specific operation is as follows: after the billet leaves the heating furnace, it is subjected to longitudinal shaping rolling using the reversible four-roll mill. After the longitudinal shaping is completed, it is subjected to transverse shaping rolling. After the longitudinal and transverse shaping rolling of the steel plate are completed, the billet is alternately subjected to widening rolling and edge extrusion rolling. After the edges are flattened, it is subjected to longitudinal finished product rolling.

[0016] The steel plate shaping rolling width is 2000-2100mm; the widening is carried out in three stages: the first widening width is 2600-2700mm, the widening ratio is 1.24-1.35%, and the vertical roller edge extrusion amount is 20-25mm; the second widening width is 3100-3200mm, the widening ratio is 1.15-1.23%, and the vertical roller edge extrusion amount is 20-25mm; the third widening width is 3550-3650mm, the widening ratio is 1.10-1.18%, and the vertical roller edge extrusion amount is 15-20mm.

[0017] The present invention will be further described in detail below with reference to specific embodiments.

[0018] The finished steel plate size of Examples 1-8 is 145*3450*6180, the raw material ingot is 36.5 tons, the steel plate composition is shown in Table 1, and the specific rolling parameters of each example are shown in Table 2.

[0019] Table 1 Steel plate composition (wt%)

[0020]

[0021] Table 2 Specific rolling parameters of each embodiment

[0022]

[0023] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A rolling method for improving the yield rate of extra-wide and extra-thick steel plates, characterized in that: The rolling process is carried out by using a reversible four-roll mill and a vertical roller mill. The specific operation is as follows: after the billet leaves the heating furnace, it is subjected to longitudinal shaping rolling by a reversible four-roll mill. After the longitudinal shaping is completed, it is subjected to transverse shaping rolling. After the longitudinal and transverse shaping rolling of the steel plate is completed, the billet is subjected to alternate widening rolling and edge squeezing rolling. After the edges are flattened, it is subjected to longitudinal finished product rolling. The steel plate shaping and rolling width is 2000-2100mm; The widening rolling is carried out in three stages; The first widening width of the steel plate is 2600-2700 mm, the width ratio is 1.24-1.35, and the vertical roller extrusion amount is 20-25 mm; The second widening width of the steel plate is 3100-3200mm, the width ratio is 1.15-1.23, and the vertical roller extrusion amount is 20-25mm; The third widening width of the steel plate is 3550-3650 mm, the width ratio is 1.10-1.18, and the vertical roller edge extrusion amount is 15-20 mm.

2. A rolling method for improving the yield rate of extra-wide and extra-thick steel plates according to claim 1, characterized in that: The edge trimming amount of the steel plate produced by the method is reduced by 200-250 mm.

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