Patent ID: 6726782
Filing Date: 2004-04-27
Classification: C21C,C22C

Abstract:
An ultra-low carbon steel having a chemical composition including, in mass percent, C: at most 0.010%, Si: at most 0.5%, Mn: at most 1.5%, P: at most 0.12%, S: at most 0.030%, Al: more than 0.01%, and at most 0.080%, N: at most 0.0080%, one or both of Ti: at most 0.10% and Nb: at most 0.05%, B: 0-0.0050%, V: 0-0.05%, Ca: 0-0.0050%, and at most 0.1% of each of Cu, Cr, Sn, and Sb as unavoidable components, wherein the total number of non-metallic inclusions observed in 60 fields under a microscope in a sample of the steel prepared in accordance with JIS G0555 is at most 20.