Cold-rolled martensitic steel substrate and production method thereof

Abstract

The invention discloses a cold-rolled martensitic steel substrate and a production method thereof, and belongs to the technical field of metallurgy. The substrate comprises the following chemical components, in percentage by mass, of 0.20% to 0.23% of C, 0.20% to 0.30% of Si, 1.30% to 1.50% of Mn, less than or equal to 0.018% of P, less than or equal to 0.010% of S, 0.030% to 0.050% of Als, 0.020% to 0.030% of Ti, 0.40% to 0.50% of Cr, 0.040% to 0.060% of V, less than or equal to 0.0050% of N and the balance iron and inevitable impurities. The production method comprises the steps of steelmaking, continuous casting, heating, rolling, cooling and coiling. The method is suitable for producing the cold-rolled martensitic steel substrate with tensile strength being less than or equal to 700 MPa and yield strength being less than or equal to 530 MPa, the problem that a steel coil is flat can be effectively solved, and follow-up cold rolling production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a cold-rolled martensitic steel substrate and a production method thereof. Background technique [0002] Under the background of high-speed advancement of automobile lightweight, advanced high-strength steel is gradually developing towards thinner gauge and higher strength. As the steel type with the highest commercial strength among advanced high-strength steels, the consumption of martensitic steel is gradually increasing. Has a good market prospect. Due to the formation of full martensitic structure in the process of cold rolling and annealing, this type of product requires high hardenability. At present, collapse is prone to occur in the production process of hot rolling base material, and because of the high alloy content, it is often As a result, the hot rolling performance is high, and the above problems will adversely affect the subsequent cold rolling pro...

AI Technical Summary

Problems solved by technology

This type of product requires high hardenability due to the formation of a full martensitic structure during the cold rolling and annealing process. At present, collapse is prone to occur in the production process of hot rolling base materials, and because of the high alloy content, it is often Leading to high hot rolling performance, the above problems will adversely affect the subsequent cold rolling production

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