High-strength hot-rolled steel sheet capable of roll forming having excellent stretch flangeability, and method for producing the steel

摘要

The present invention is a high-strength hot-rolled steel strip or steel plate having excellent roll formability and excellent stretch flange formability suitable for automobile chassis parts, more specifically 780 MPa or more, preferably 950 MPa or more. High-strength hot-rolled steel strip or steel sheet having an excellent combination of total elongation, stretch flangeability and fatigue resistance, and method for producing the steel strip or steel sheet, steel strip or steel sheet Related to use in parts.