Dual phase steel with tensile strength of 1000 MPa and production method thereof

The invention discloses a dual phase steel with tensile strength of 1000 MPa and a production method thereof. The dual phase steel is composed of the following chemical components in percentage by weight: 0.08%-0.11% of C, 0.2%-0.6% of Si, 2.0%-2.5% of Mn, at most 0.01% of P, at most 0.01% of S, 0.02%-0.06% of Al, 0.4%-0.6% of Cr, 0.02%-0.05% of Ti, at most 0.003% of N, and the balance of Fe and inevitable impurities. The method solves the technical problem of how to lower the alloy cost and enhance the reaming property and delayed fracture resistance of the material on the premise of satisfying the strength requirement. 本发明公开了的种抗拉强度1000MPa的双相钢及其生产方法，所述双相钢的化学成分按重量百分比为：C：0.08％～0.11％；Si：0.2％-0.6％；Mn：2.0％～2.5％；P：≤0.01％；S：≤0.01％；Al：0.02％～0.06％；Cr：0.4％-0.6％；Ti:0.02％-0.05％；N：≤0.003％，其余为Fe及不可避免的杂质，解决了如何在满足强度要求的基础上降低合金成本，提高材料的扩孔性能及耐延迟断裂性能的技术问题。