Manufacturing method of thin-gauge high-strength structural steel plate with good low-temperature impact toughness

The invention belongs to the technical field of steel manufacturing, and relates to a manufacturing method of a thin-gauge high-strength structural steel plate with good low-temperature impact toughness, which comprises the steps of KR desulfurization, converter smelting, LF refining, RH refining, continuous casting, heating, rolling, cooling, heat treatment and finishing. According to the method, the thin-gauge high-strength steel plate with good low-temperature impact toughness is stably produced in the mode that precious metal Ni is not added, and a single rolling process and a heat treatment process are reasonably combined, and meanwhile, flexible production of one steel with different strength grades of Q420-Q500 and multiple grades of Q420-Q500 is also achieved by changing the heat treatment process. 本发明属于制钢技术领域，涉及一种薄规格低温冲击韧性良好的高强度结构钢板制造方法，采用KR脱硫、转炉冶炼、LF精炼、RH精炼、连铸、加热、轧制、冷却、热处理、精整；实现了不添加贵金属Ni，单从轧制工艺与热处理工艺合理组合的方式，稳定生产出低温冲击韧性良好的薄规格高强度钢板，同时也实现了通过改变热处理工艺制备出Q420～Q500不同强度等级的一钢多级的柔性生产。