LOW YIELD RATIO HIGH STRENGTH HOT-ROLLED STEEL SHEET WITH SOLID DIFFUSION BONDING PROPERTIES, AND METHOD FOR PRODUCING THE SAME

摘要

The present invention relates to a high strength hot-rolled steel sheet used in a rim of a wheel for a vehicle, a member type of a chassis component, and the like and, more specifically, relates to a low yield ratio strength hot-rolled steel sheet with excellent solid diffusion bonding properties; and a method to produce the same suitable for an endless rolling process. The present invention comprises: 0.05-0.2 wt% of C; 0.05-0.2 wt% of Si; 1.0-2.0 wt% of Mn; 0.01-0.15 wt% of Al; 0.005-0.5 wt% of Cr; 0.001-0.05 wt% of P; 0.001-0.01 wt% of S; 0.001-0.01 wt% of N; and remainder consisting of Fe and inevitable impurities.