| 摘要 |
A high formability super strength cold-roll steel sheet or steel strip, and a manufacturing method therefor. The steel sheet or steel strip comprises the following ingredients by weight percent: C 0.15% to 0.35%, Si 1.0% to 2.0%, Mn 1.6% to 2.6%, Mo 0.1% to 0.4%, P≤0.02%, S≤0.004%, N≤0.005%, Nb 0.015% to 0.04%, Ti 0.02% to 0.06%, Al 0.015% to 0.045%, B 0.0003% to 0.001% and B≥P%/30, and the balance of Fe and inevitable impurities. The steel sheet or steel strip has tensile strength greater than or equal to 980 MPa, an elongation rate greater than or equal to 15% and a hole expansion rate greater than or equal to 40%, and has balanced performance. |
