本发明提供一种抗氢致延迟开裂的高强钢及制备方法，属于高强钢技术领域。该高强钢质量百分比组成为：C：0.22～0.25％、Si：0.25～0.35％、Mn：1.2～1.4％、S：≤0.005％、P：≤0.02％、Al：0.02～0.05％、Ti：0.02～0.05％、Cr：0.11～0.2％、B：0.002～0.0035％、Nb：0.025～0.055％、N：N/(Ti+Nb)＝1/8～1/6、Fe:余量。该高强钢通过22MnB5钢添加微量Nb、N，形成Ti、Nb、N复合微合金化，使材料的组织中析出弥散分布的纳米级(<10nm)碳氮化物；该析出物可以形成氢陷阱，对氢起钉扎作用，抑制氢的扩散，使氢在基体中均匀分布，避免氢原子聚集成氢气团，从而使钢具有抗氢致延迟开裂的能力。本发明所述的钢还具有良好的力学性能，其屈服强度和韧性好于含铌量在该范围以外的同种材料。

The invention provides high-strength steel capable of resisting hydrogen-induced delayed cracking and a preparation method thereof, and belongs to the technical field of high-strength steel. The high-strength steel comprises, by mass percentage, 0.22-0.25% of C, 0.25-0.35% of Si, 1.2-1.4% of Mn, less than or equal to 0.005% of S, less than or equal to 0.02% of P, 0.02-0.05% of Al, 0.02-0.05% of Ti, 0.11-0.2% of Cr, 0.002-0.0035% of B, 0.025-0.055% of Nb, N and the balance Fe, wherein N/(Ti+Nb) is equal to 1/8-1/6. The high-strength steel and the preparation method have the advantages that the trace Nb and the trace N are added into 22MnB5 steel so as to achieve Ti, Nb and N composite micro-alloying, and nano-scale (<10nm) carbon nitrides which are dispersively distributed can be separated out in the tissue of a material; the precipitate can form a hydrogen trap and has a pinning effect on hydrogen, the diffusion of hydrogen is inhibited, the hydrogen is uniformly distributed in a matrix so that hydrogen atoms can be prevented from gathering into hydrogen groups, and therefore the steel has the capacity of resisting hydrogen induced delayed cracking; and the steel also has the good mechanical property, and the yield strength and the toughness of the steel are better than the yield strength and the toughness of the same material with the Nb content beyond the range.