Low-cost cold-rolled steel plate production method

A technology of cold-rolled steel sheet and production method, which is applied in the field of low-cost cold-rolled steel sheet production, can solve problems such as rising production costs, and achieve the effects of lower production costs, better material strength, and better stamping and forming performance.

Inactive Publication Date: 2015-07-01
攀钢集团西昌钢钒有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the adoption of the deep decarburization process to control the carbon content at a low level

Method used

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  • Low-cost cold-rolled steel plate production method
  • Low-cost cold-rolled steel plate production method
  • Low-cost cold-rolled steel plate production method

Examples

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Example Embodiment

[0023] In the following, the present invention will be further described in conjunction with the embodiments:

[0024] The low-cost cold-rolled steel plate production method includes the following steps in sequence:

[0025] A. Control the composition of molten steel by weight percentage, C: 0.010%~0.035%, Si: ≤0.03%, Mn: 0.10%~0.25%, P: 0.008%~0.020%, S: 0.008%~0.015%, Als :0.010%~0.060%, the rest is Fe and unavoidable impurities, and then molten steel is cast into billets;

[0026] B. The steel slab is heated to 1200~1230℃ in the furnace for 350~400min; the heated steel slab is rough-rolled, and the thickness of the rough-rolled slab is 47~50mm;

[0027] C. Perform finishing rolling on the rough-rolled slab, the start-rolling temperature of the finishing-rolling is 1000~1050℃, and the finishing temperature of the finishing-rolling is 880~910℃, to obtain a finished-rolled slab with a thickness of 3-6mm; The finished slab is cooled to 730~760℃ and coiled into a steel strip;

[0028] D...

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Abstract

The invention relates to a low-cost cold-rolled steel plate production method, which comprises the following steps: controlling the compositions of molten steel; casting the molten steel into a steel billet; heating to 1200-1230DEG C; rough-rolling; refined rolling; reeling into a steel strip reel; cold rolling; continuously annealing, wherein a heating zone is at 780-810DEG C, a soaking zone is at 820-840DEG C, a retarded cooling zone is at 670-700DEG C, a rapid cooling zone is at 320-350DEG C, and an overaging zone is at 340-380DEG C; and cooling to room temperature. The production method is not required for adopting a deep decarbonization technology and adding alloy elements of Ti and the like, so that the production cost is lowered, the mechanical performance of the product achieves the yield strength of 140-170MPa, tensile strength of 280-320MPa, elongation rate of more than or equal to 45.0%, plastic strain ratio of more than or equal to 2.4 and strain hardening index of more than or equal to 0.22, to meet the market requirement, and has good impact molding processability and better material strength.

Description

technical field [0001] The invention belongs to the field of steel plate production, in particular to a low-cost cold-rolled steel plate production method. Background technique [0002] Cold-rolled steel sheets are steel sheets formed by rolling below the recrystallization temperature of steel. Compared with hot-rolled steel sheets, their surfaces are smoother and are widely used in the fields of automobiles and home appliances. [0003] The existing cold-rolled steel plate process usually first heats the steel billet to above the recrystallization temperature for hot rolling, and the hot-rolled slab is cooled and coiled into coils, and then uncoiled, cleaned, and then cold-rolled. The finished steel plate is annealed to become a finished product. [0004] For example, the patent number is 201110052830.5, which is called low-temperature continuous annealing interstitial-free cold-rolled steel sheet and its production method. 0.2%, P≤0.015%, S≤0.01%, O≤0.025%, N:≤0.0025%, A...

Claims

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Application Information

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IPC IPC(8): C22C38/06C21D8/02
Inventor 郑之旺王敏莉周三保苏琳王羿王宏伟于秀
Owner 攀钢集团西昌钢钒有限公司
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