Hot-formed steel with tensile strength ≥ 2100mpa directly rolled by medium-thin slab and production method

Abstract

The invention discloses hot forming steel rolled directly through a medium-thin slab and with the tensile strength being larger than or equal to 2100MPa. The hot forming steel comprises, by weight, 0.41%-0.50% of C, 0.45%-0.65% of Si, 1.6%-2.0% of Mn, 0-0.006% of P, 0-0.004% of S, 0.015%-0.060% of Als, 0.55%-0.65% of Cr, 0.046%-0.060% of Ti or 0.046%-0.060% of Nb or 0.046%-0.060% of V or a compound of any two of the above components, 0.004%-0.005% of B, 0.46%-0.60% of Mo, 0.25%-0.40% of Ni and 0-0.004% of N. The production method includes the production steps of molten iron desulphurization, smelting and refining through an electric furnace or converter, continuous casting, dephosphorization treatment before entering a soaking pit, soaking, heating, high pressure water dephosphorization before entering a rolling mill, rolling, cooling, coiling, austenitizing, mold stamping forming and quenching. The hot forming steel is high in strength, short in manufacturing process, good in surface quality, high in thickness precision and capable of greatly saving energy consumption, thereby being of great significance to achieving lightweight of automobiles.

Description

technical field [0001] The invention relates to a steel for auto parts and a production method thereof, in particular to a hot-formed steel with a tensile strength ≥ 2100 MPa directly rolled by medium and thin slabs and a production method thereof, and is suitable for producing products with a thickness greater than 2 to 100 MPa. 10mm. Background technique [0002] With the development of the automobile industry and the gradual development of automobile design and manufacturing in the direction of energy saving, environmental protection and safety, automobile lightweight has become the mainstream direction of automobile design at present and for a long time to come. [0003] The study found that the vehicle's vehicle weight and energy consumption have a linear relationship. According to statistics, every 10% reduction in vehicle weight can increase fuel efficiency by 6% to 8%. One of the most important ways to reduce the weight of automobiles is to use high-strength and ul...

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Problems solved by technology

[0006] The present invention overcomes the disadvantages of the prior art that the strength level is low and the rigidity cannot meet the requirements of users, and provides a method that can not only meet the requirements of automobile design for ultra-high strength mechanical properties, but also can successfully complete complex deformation, and after deformation No springback, high dimensional accuracy of parts, hot-formed steel with tensile strength ≥ 2100MPa and production method

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