| 摘要 |
A high-strength high-tenacity steel plate with a tensile strength of 800 MPa and a production method therefor. Weight percentages of chemical compositions of the high-strength high-tenacity steel plate are: C:0.15-0.25%, Si:1.0-2.0%, Mn:1.2-2.0, P≤0.015%, S≤0.005%, Al:0.5-1.0%, N≤0.006%, Nb:0.02-0.06%, O≤0.003%, and other compositions in the steel plate are Fe and other inevitable impurities; and the weight percentages satisfy 1.5%≤Si+Al≤2.5%. By adopting an isothermal heat treatment process, the high-strength high-tenacity steel plate with the tensile strength of 800 MPa is obtained, and the microscopic structure thereof is mainly bainitic ferrite and retained austenite. |
