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A method for producing thin-gauge low-alloy high-strength steel using thin-slab continuous casting and rolling technology

A thin slab continuous casting, thin gauge technology, applied in the direction of rolls, metal rolling, manufacturing tools, etc., can solve the problems of excessive thickness, wear, and large temperature fluctuations of strip steel, so as to reduce production costs and improve dimensional accuracy. Effect

Active Publication Date: 2018-05-08
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of producing these thin-gauge low-alloy high-strength steels using this process, the following problems are still encountered: 1. The unreasonable distribution of the pressing of each stand causes a certain stand to reach the load limit, making the rolling process unstable; 2. Due to the continuous long-term production of strip steel, the work rolls of each stand (especially the work rolls of the finishing mill) are severely worn, which makes it difficult to control the thickness accuracy and shape accuracy of the strip steel, and obvious thickness deviation and wave shape appear; 3 1. The temperature drop of thin-gauge steel strip is very fast, and the temperature of the strip steel fluctuates greatly, so that the hit rate of the target finishing temperature is low, which has an adverse effect on the mechanical properties of the strip steel

Method used

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  • A method for producing thin-gauge low-alloy high-strength steel using thin-slab continuous casting and rolling technology
  • A method for producing thin-gauge low-alloy high-strength steel using thin-slab continuous casting and rolling technology
  • A method for producing thin-gauge low-alloy high-strength steel using thin-slab continuous casting and rolling technology

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Experimental program
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Effect test

Embodiment 1

[0050] This embodiment provides a method for producing thin-gauge low-alloy high-strength steel using the thin-slab continuous casting and rolling process. The process route is as follows figure 1 As shown, firstly, the molten steel is continuously cast into a continuous casting slab with a width of 1300-1600 mm and a thickness of 65-96 mm, and then rough rolling, insulation cover insulation, induction heating, high-pressure water descaling and finish rolling are carried out in sequence to obtain a width of 1300-1300 mm. 1600mm, ultra-thin strip steel with a thickness of 1.3-1.6mm, and finally controlled cooling, coil cutting and coiling. The main process steps and process parameters are as follows:

[0051] (1) Continuous casting

[0052] The chemical composition of the molten steel is: C 0.04%-0.08%, Si 0.1%-0.2%, Mn 0.3%-0.5%, Al 0.02%-0.04%, P≤0.015%, S≤0.012%, N ≤0.008%, Ca≤0.002%, Cu≤0.15%, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.02%, Nb≤0.025%, the rest is Fe and u...

Embodiment 2

[0078] This embodiment provides a more detailed and optimized process scheme on the basis of Embodiment 1, which can make the longitudinal thickness accuracy, flatness accuracy and surface quality of the finished strip steel better, and obtain a cold-rolled strip equivalent to the same specification. Comprehensive mechanical properties.

[0079] The thickness of the continuous casting slab is 72-82 mm, and the casting speed is 5.9-6.5 m / min.

[0080] The reduction ratio of the first rough rolling mill of the rough rolling unit is 50% to 55%, the rolling temperature is controlled at 1125 to 1145°C, and the rolling pressure per unit width is 13 to 15KN / mm; the reduction ratio of the second rough rolling mill is 40%~45%, the rolling temperature is controlled at 1060~1080°C, the rolling pressure per unit width is 13.5~14.5KN / mm; the reduction rate of the third rough rolling mill is 35%~40%, and the rolling temperature is controlled at 1000~ 1020°C, the rolling pressure per unit w...

Embodiment 3

[0090] In this embodiment, the production of a finished steel strip with a carbon content of 0.06%, a width of 1300mm, and a thickness of 1.5mm is taken as an example, and the specific process is as follows.

[0091] Continuous casting of molten steel into a continuous casting slab with a width of 1300mm and a thickness of 80mm, followed by rough rolling, heat preservation in a heat preservation cover, induction heating, high-pressure water descaling and finish rolling to obtain an ultra-thin strip steel with a width of 1300mm and a thickness of 1.5mm , and finally controlled cooling, coil cutting and winding into rolls. The main process steps and process parameters are as follows:

[0092] (1) Continuous casting

[0093] The chemical composition of the molten steel is: C 0.04%-0.08%, Si 0.1%-0.2%, Mn 0.3%-0.5%, Al 0.02%-0.04%, P≤0.015%, S≤0.012%, N ≤0.008%, Ca≤0.002%, Cu≤0.15%, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.02%, Nb≤0.025%, the rest is Fe and unavoidable trace ...

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Abstract

The invention relates to a method for using a thin slab continuous casting and rolling technology for producing thin-specification, low-alloy and high-strength steel. Molten steel is continuously cast into a continuous casting blank with the width being 1300 mm to 1600 mm and the thickness being 65 mm to 96 mm; then rough rolling, heat insulation cover heat insulation, induction heating, high-pressure water scale removing and finish rolling are conducted in sequence, and ultrathin strip steel with the width being 1300 mm to 1600 mm and the thickness being 1.3 mm to 1.6 mm is obtained; and finally the strip steel is controlled to be cooled, shorn in different rolled and are coiled into rolls. The yield strength of the thin-specification double-phase steel finished product ranges from 380 MPa to 430 MPa, the tensile strength ranges from 530 MPa to 610 MPa, and the elongation is larger than or equal to 25%. By means of the method, stable production of hot rolled thin-specification, low-alloy and high-strength steel with the thickness being 1.3 mm to 1.6 mm can be achieved, the size precision, the plate shape precision and the comprehensive mechanical performance are improved, the requirement for replacing cold with hot is met, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of hot rolling, and more specifically relates to a method for producing thin-gauge, low-alloy, high-strength steel using a thin-slab continuous casting and rolling process. Background technique [0002] The technical route of the newly developed thin slab continuous casting and rolling process at home and abroad is: continuous casting - rough rolling - shearing - heat preservation - induction heating - descaling - finishing rolling - controlled cooling - shearing - coiling. Compared with the traditional thin slab continuous casting and rolling process, this process can produce thinner hot-rolled strip steel, and the product can realize "replacing cold with heat", thereby reducing energy consumption and production costs to a greater extent, so it has the advantages of Broad market prospects. [0003] At present, the thickness of low-alloy high-strength steel products produced by this process can reach 1.3-1....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B1/26B21B45/08B21B45/00B21B37/74B21B45/02B21B37/58B21B37/62B21B37/16B21B37/22B21B15/00B21B27/10C22C38/04C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48
CPCB21B1/26B21B1/463B21B15/0007B21B37/16B21B37/22B21B37/58B21B37/62B21B37/74B21B45/004B21B45/0203B21B45/08B21B2027/103C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48Y02P70/10
Inventor 陈全忠陈连龙吴有生
Owner WISDRI ENG & RES INC LTD
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