Hot rolled steel strip for heat stamping and shaping and production method thereof

Abstract

The invention discloses a hot rolled steel strip for heat stamping and shaping and a production method thereof. The hot rolled steel strip is prepared from the following components according to mass percent: 0.20 to 0.25% of C, 0.15 to 0.35% of Si, 1.20 to 1.50% of Mn, 0.10 to 0.50% of Cr, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.030 to 0.050% of Als, 0.030 to 0.050% of Ti, less than or equal to 0.0060% of N, 0.0020 to 0.0050% of B and Fe and inevitable impurities as the rest. The production method comprises the following steps of pretreating hot metal, smelting with a converter, performing LF refining and slab continuous casting, heating, rolling, cooling and coiling; steel plate components and processes are optimized, slow cooling after rolling is adopted, and the coiling temperature and the coiling tension are set. The problems of casting slab cracks, flat coils and the like are solved, and the steel strip with good mechanical homogeneity for the heat stamping and shaping is obtained.

Description

Technical field [0001] The invention relates to a hot-rolled steel strip for hot stamping forming and a production method thereof, and belongs to the technical field of steel smelting. Background technique [0002] With the continuous improvement of the requirements for lightweight and safety of automobiles, the requirements for anti-collision beams for automobiles are also getting higher and higher. The steel strip is required to have sufficient strength after heat treatment. At the same time, its processing and forming characteristics also require the steel strip to be heat treated. It has good performance uniformity before avoiding the loss of yield rate in processing links. [0003] The industrial production of hot stamping and forming steel has high requirements on the composition and metallurgical quality of the steel, which needs to solve many problems in the production process, such as the instability of the composition and temperature control caused by the large amount of ...

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Problems solved by technology

[0006] The invention provides a hot-rolled steel strip for hot stamping and its production method. By optimizing the composition and process of the steel plate, slow cooling after rolling, setting the coiling temperature and coiling tension, etc., the cracks in the cast slab are solved. , flat coil and other problems, obtained a steel strip for hot stamping with good mechanical uniformity

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