HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT FLASH BUTT WELDABILITY, FATIGUE CHARACTERISTIC AND FORMABILITY

摘要

ABSTRACT OF THE DISCLOSUREA high strength hot rolled steel sheet having excellentflash butt weldability, fatigue characteristic and formability,has a composite structure composed of polygonal ferrite andbainite and containing from 0,01 to 0,15% by weight of C, from0.01 to 1.5% by weight of Si and from 0.3 to 2.0% by weight ofMn, the rest being Fe and impurities, the areal ratio of thebainite being from 3 to 60%. The steel sheet is suitable as amaterial for wheel rims or discs for automobiles.