High-toughness hot-formed steel with tensile strength higher than or equal to 1800 MPa grade and production method thereof

Abstract

The invention discloses a high-toughness hot-formed steel with tensile strength higher than or equal to the 1800 MPa grade and a production method thereof, and belongs to the technical field of metallurgy. The high-toughness hot-formed steel with the tensile strength higher than or equal to the 1800 MPa grade comprises components including, by mass, 0.29%-0.35% of C, not larger than 0.5% of Si, 0.5%-1.5% of Mn, not larger than 0.020% of P, not larger than 0.010% of S, not larger than 0.50% of Cr, 0.01%-0.06% of Al, 0.01%-0.06% of Nb, 0.01%-0.06% of V, not larger than 0.5% of Mo and the balanceFe and inevitable impurities. The high-toughness hot-formed steel is produced by the following processes including smelting, blank casting, hot rolling, cold rolling, annealing and hot forming. According to the high-toughness hot-formed steel and the production method, specific component alloy elements are added, the specific production processes are used in cooperation, and therefore the manufactured steel has the tensile strength higher than or equal to the 1800 MPa and has high toughness and high cold bending property.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more specifically relates to a high-toughness hot-formed steel with a tensile strength ≥ 1800 MPa and a production method thereof. Background technique [0002] Automobile lightweight technology is one of the key technologies to adapt to the trend of modern automobile safety, energy saving and environmental protection. At present, more and more automobile body parts use thermoforming technology (such as: automobile bumpers, anti-collision beams, A-pillars, B-pillars , door bumper, etc.). Thermoforming technology is a new process that divides forming and strengthening into two steps to produce ultra-high-strength auto parts. The produced parts have the advantages of ultra-high strength, high forming precision, and no springback. [0003] At present, the hot-formed steel widely used in the market is 1500MPa strength level. As the laws and regulations on automobile energy consumption and saf...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of low toughness and low cold bending properties of hot-formed steel with tensile strength ≥ 1800 MPa in the prior art, the present invention provides a high-toughness hot-formed steel with tensile strength ≥ 1800 MPa and its production method. The addition of elements, combined with a specific manufacturing process, produces hot-formed steel with a tensile strength ≥ 1800 MPa, which has high toughness and high cold-bending performance

Images