High-energy welded high-toughness steel for resisting corrosion of molten zinc and its preparing process

[0029]Embodiment 1: According to the chemical composition requirements of the steel of the present invention, hot metal is desulfurized, blown in a converter, vacuum treated, and then rolled, and the steel is fired at 1250-1320°C, and the rolling temperature is controlled at 1180-1000°C and below 950°C , cumulative reduction rate ≥ 50%. Subsequently, the steel of the present invention was tested for tensile properties at room temperature and 350°C. The impact toughness of the steel plate at room temperature and the impact toughness of HAZ at room temperature after welding with a large input energy of 60kJ / cm were tested, and compared with the corresponding comparative steel. The data are shown in Table 1. .

[0030] The tensile properties of the steel of the invention at room temperature and 350°C are significantly higher than those of the comparison steel, and the impact toughness at -20°C before the welding heat simulation test is at the same level as that of the comparison ...