Hot rolled steel sheet having high resistances against secondary-work embrittlement and brazing embrittlement and adapted for ultra-deep drawing and a method for producing the same

摘要

A hot rolled steel sheet having a limited composition and a small ferrite grain size is produced by hot rolling, fast cooling and coiling. The sheet has high resistance to secondary work and brazing embrittlement and is adapted for ultra-deep drawing. The very low carbon steel sheet has a titanium content satisfying the following equations: fromto