Patent ID: 11821063

Abstract:
A high-strength steel allowing low-temperature welding and high-heat input welding and a production method thereof are provided, which belongs to the technical field of steel production. The high-strength steel includes the following chemical components by mass fraction: 0.03-0.16% of C, 0.05-0.5% of Si, 1.0-1.9% of Mn, 0.002-0.02% of P, 0.001-0.01% of S, 0.005-0.07% of Al, 0.005-0.04% of Ti, 0.1-0.5% of Cr, 0.0005-0.005% of B, 0.002-0.01% of Mg+Zr, 0.001-0.008% of O, 0.004-0.01% of N, and the balance of Fe and residual elements. Magnesium and zirconium are added to form magnesium/zirconium oxide, titanium and boron are added to form titanium/boron nitride, and the two types of precipitates work synergistically to improve the microstructure of a heat-affected zone. The method optimizes the chemical composition and production process of existing high-strength steel.