High-strength hot-rolled steel strip or steel plate having very excellent formability and fatigue performance, and method for producing the steel strip or steel plate

摘要

The present invention produces a high-strength hot-rolled steel strip or steel plate having a very excellent combination of tensile strength of 570 to 870 MPa and total elongation, stretch flangeability, and fatigue resistance, and the steel strip or steel plate. And a chassis part made therefrom.