Super mild steel having excellent workability and non-aging properties

摘要

The present invention relates to a super mild steel (a very low yield point steel) having excellent workability and nonaging properties, which consists of in weight percent up to 0.07% C, up to 0.5% Si, up to 0.5% Mn, of 0.005 to 0.1% Al and up to 0.22% [C+1/5(Si+Mn)], and 0.1 to 1.3% Cr when Cr is only added or 0.1 to 1.3% Cr and 0.015 to 0. 15% Zr when Cr and Zr are simultaneously added, the balance being iron and inevitable impurities.