High-nitrogen vanadium microalloyed steel and preparation method thereof

The invention discloses high-nitrogen vanadium microalloyed steel and a preparation method, and belongs to the technical field of metallurgy, and the high-nitrogen vanadium microalloyed steel provided by the invention comprises the following chemical components in percentage by mass: 0.05% < = V < = 0.1%, 0.012% < = N < = 0.018%, and 0.01% < = Al < = 0.015%. According to the high-nitrogen-vanadium microalloyed steel and the preparation method, the content of the N element is as high as 0.018%, the number and the cracking degree of corner cracks of a casting blank are greatly reduced while it is guaranteed that the N element is effectively combined with the V element to achieve the precipitation strengthening effect, and the quality of the casting blank is improved. 本发明公开了一种高氮钒微合金化钢及制备方法，属于冶金技术领域，本发明提供的所述高氮钒微合金化钢的化学成分质量分数包括：0.05％≤V≤0.1％，0.012≤N≤0.018％，0.01％≤Al≤0.015％。本发明提供的高氮钒微合金化钢及制备方法，N元素含量高达0.018％，在保证有效与V元素结合起到沉淀强化作用的同时，还大幅度减少了铸坯角部裂纹的数量以及开裂程度，提高了铸坯质量。