Automotive structural steel, manufacture method thereof and manufacture method of automotive structural part

The invention discloses automotive structural steel, a manufacture method thereof and a manufacture method of an automotive structural part. The automotive structural steel comprises, by mass, 0.07%-0.15% of C, 0.1%-0.2% of Si, 1.0%-2.0% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.004% of S, smaller than or equal to 0.04% of Al, 0.0040%-0.0070% of N, 0.1%-0.4% of Re, 0.10%-0.20% of V, 0.02%-0.06% of Nb and the balance Fe and unavoidable impurities. According to the automotive structural steel, the fatigue property is improved in the mode of reducing the hardness difference between a weld seam and a heat affected zone thereof and a base material, improving the surface hardness of a steel plate, reducing large inclusions in the steel and reducing the molded residual stress. 本发明公开了一种汽车结构用钢及其制造方法及汽车结构件的制造方法。其中，汽车结构用钢，以质量％计，包括：C：0.07％-0.15％，Si：0.1％-0.2％，Mn：1.0％-2.0％，P：≤0.015％，S：≤0.004％，Al：≤0.04％，N：0.0040％-0.0070％，Re：0.1％-0.4％，V：0.10％-0.20％，Nb：0.02％-0.06％，其余为Fe和不可避免的杂质。本发明通过降低焊缝及其热影响区与母材