The invention belongs to the steel technical field, and specifically, relates to a
vanadium-
nitrogen microalloyed high-strength phase-transformation induced plastic steel seamless
pipe and a preparation method thereof. The
vanadium-
nitrogen microalloyed high-strength phase-transformation induced plastic steel seamless
pipe comprises the
chemical ingredients by the weight percentage: 0.18%-0.24% of C, 1.0%-1.6% of Si, 1.2%-1.6% of Mn, 0.17%-0.22% of V, 0.01%-0.03% of N, not more than 0.06% of P, not more than 0.005% of S, and the balance iron and unavoidable impurities. With utilization of an intermediate-frequency induction heat treatment device of a thin-wall steel
pipe and with supplementary of a
vanadium-
nitrogen microalloyed component design, the
advantage of cooperation of good strength and elongation of phase-transformation induced plastic steel is successfully applied to the steel pipe production field, a fact of replacing
solid components with hollow components is effectively realized so as to achieve automobile light weighting, besides, further development of an internal
high pressure forming technology is promoted, not only are the internal
high pressure formed components with high strength,
large deformation and complex shape produced, but also the production cost is greatly reduced, and the preparation method has wide application prospects are provided.