SN AND P-CONTAINING LOW CARBON HOT ROLLED STEEL SHEET GOOD IN SURFACE PROPERTY AND ITS PRODUCTION

摘要

PURPOSE: To produce a hot rolled steel sheet improved in strength and good in surface properties by regulating the Sn concn. in the surface layer of a hot rolled steel sheet having specified chemical components to specified %. ;CONSTITUTION: The chemical components of this hot rolled steel sheet is constituted of 0.01 to 0.04% C, ≤0.02% Si, ≤1.50% Mn, 0.004 to 0.10 Sol.Al, ≤0.0050% N, 0.030 to 0.100% P, ≤0.03% S, 0.01 to 0.400% Sn, and the balance Fe with inevitable impurity elements. Then, the Sn concn. in the surface layer of the steel sheet is regulated to ≤5%. As the chemical components, 0.02 to 0.3% Ni and/or 0.02 to 0.5% Cr are furthermore incorporated. Thus, the recycle of iron scraps such as tin plate scraps and steel can scraps can be promoted.;COPYRIGHT: (C)1995,JPO