Cold-rolled steel strip for boron-added structure and production method of cold-rolled steel strip

Abstract

The invention discloses a cold-rolled steel strip for a boron-added structure and a production method of the cold-rolled steel strip. The steel strip comprises the following chemical components in percentage by mass: 0.020-0.050% of C, less than or equal to 0.020% of Si, 0.20-0.35% of Mn, 0.018-0.025% of P, less than or equal to 0.020% of S, 0.020-0.055% of Als, 0.0010-0.0025% of B and the balance of Fe and inevitable impurities. A production process comprises procedures of steelmaking, continuous casting, hot continuous rolling, acid continuous rolling and continuous annealing. A low Mn+P+B component design system without adding precious alloy elements is adopted, through control over key process parameters such as high hot rolling coiling temperature, a low cold rolling total reduction rate and high annealing soaking temperature, the requirements of machining such as punch forming are met, the component design is simple, the production cost is low, quality control is stable, and the cold-rolled steel strip for the boron-added structure and the production method of the cold-rolled steel strip are suitable for large-scale industrial stable production.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a cold-rolled steel strip for a boron-added structure and a production method thereof. Background technique [0002] Stamping steel generally adopts low-carbon cold-rolled steel plates. The yield ratio is a key indicator to measure the formability of metal materials. The lower the yield ratio, the greater the deformation energy required for the material from the beginning of plastic deformation to fracture, so that its coordinated deformation The stronger the ability. At present, the best stamping is mainly IF steel, which uses ultra-low carbon plus Nb, Ti and other alloys, but its alloy cost is high, and it has high requirements for smelting control. In today's fierce competition in the steel industry, how to control the smelting composition Research on production technology has become the key for domestic iron and steel enterprises to gain competitive advantage. [0003] C...

AI Technical Summary

Problems solved by technology

[0007] Therefore, it is necessary to design a boron-added cold-rolled steel strip and its production method to solve the problems of high alloy cost and high requirements for smelting control in the existing cold-rolled steel strip smelting process

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