| 摘要 |
<p>PURPOSE: A high-strength ultra-thin cold rolled steel sheet with improved moldability and a method for manufacturing the same are provided to obtain a high-strength ultra-thin steel material by using Mn, Ni, Cr, Mo, and B to improve curing ability. CONSTITUTION: A high-strength ultra-thin cold rolled steel sheet with improved moldability comprises carbon(C) of 0.15-0.25 weight%, manganese(Mn) of 1.5-2.5 weight%, silicon(Si) of 0.1-1.0 weight%, titanium(Ti) of 0.01-0.05 weight%, boron(B) of 5-30ppm, phosphorus(P) of 0.01-0.08 weight%, and iron(Fe) and inevitable elements of the remaining amount. The organization of the ultra-thin cold rolled steel sheet comprises bainite 70vol% or more and the rest ferrite.</p> |
