VACUUM DEGASSED, INTERSTITIAL-FREE, LOW CARBON STEEL AND METHOD FOR PRODUCING SAME

摘要

A low carbon, vacuum degassed steel containing columbium, titanium and/or zirconium, having high ductility, no yield point elongation in the hot rolled and cold rolled and annealed conditions. The steel contains from 0.002 to 0.020 percent carbon, up to 0.60 percent manganese, from greater than 0.025 to 0.12 percent columbium, titanium when present from 0.015 to 0.12 percent, zirconium when present from 0.028 to 0.18 percent, up to 0.008 percent nitrogen, up to 0.010 percent total oxygen, up to 0.035 percent sulfur, up to 0.045 percent total aluminum, and balance substantially iron. The steel has extra-deep drawing quality.