Economical low-temperature continuous annealing cold-rolled high-strength steel strip and production method thereof

Abstract

The invention discloses an economical low-temperature continuous annealing cold-rolled high-strength steel strip and a production method thereof. The steel strip comprises the following chemical components in percentage by mass: 0.030-0.060% of C, less than or equal to 0.050% of Si, 0.30-0.55% of Mn, 0.015-0.025% of P, less than or equal to 0.020% of S, 0.020-0.060% of Als and the balance of Fe and inevitable impurities. The manufacturing method comprises the procedures of steelmaking, continuous casting, hot continuous rolling, acid continuous rolling and continuous annealing. A component design system without adding precious alloy is adopted, through control over the low hot rolling temperature, the large cold rolling reduction, the low annealing soaking temperature and the like, the steel strip has the fine grain structure, enough dislocation is reserved, the machining requirements of shallow stamping and bending forming can be met, and the steel strip has the characteristics of being low in production cost and high in efficiency, and is widely applied in the fields of traffic, construction and like.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an economical low-temperature continuous annealing cold-rolled high-strength steel strip and a production method thereof. Background technique [0002] With the rapid development of the country's industry, the demand for steel consumption in the fields of transportation and construction is increasing. The continuous annealed cold-rolled high-strength steel strip relies on uniform mechanical properties, high dimensional accuracy, and excellent surface quality and shape quality. The application is more and more extensive. However, as the pressure of competition continues to increase, how to reduce production costs before ensuring product quality is a challenge for steel companies, especially for different application fields, different processing characteristics, better combination of user needs, and low-cost development Produce products that meet the user's performance and othe...

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Problems solved by technology

Compared with the present invention, CN108823499B has high chemical composition alloy cost, adopts a bell annealing furnace for production, low production efficiency, and poor uniformity and surface quality control of steel strip mechanical properties

[0006] Therefore, it is necessary to design an economical low-temperature continuous annealing cold-rolled high-strength steel strip and its production method to solve the problems of high smelting control requirements and high production costs in the existing cold-rolled steel smelting process

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