Patent ID: 8491735
Filing Date: 2013-07-23
Classification: C21D,C22C

Abstract:
1. A method for producing a steel sheet for vitreous enameling, the method comprising the steps of hot rolling a steel sheet consisting essentially of, in mass, C: 0.0025% or less, Mn: 0.03 to 1.3%, Si: 0.03% or less, Al: 0.02% or less, N: 0.0055% or less, P: below 0.035%, S: over 0.025% to 0.08%, Cu: 0.02% to 0.045%, Nb: 0.036% to 0.06%, and V: 0.003 to 0.06%, and the balance of Fe and unavoidable impurities, in a temperature range of 600° C. or higher so that a total true strain is 0.4 or more under conditions that a temperature is 1,000° C. or higher and a strain rate is 1/sec. or more; and thereafter, hot rolling the steel sheet so that the total true strain is 0.7 or more under conditions that a temperature is 1,000° C. or lower and a strain rate is 10/sec. or more, wherein said steel sheet has voids of 0.10 μm or more in size among oxide grains and said voids are dispersed in the interior of the steel sheet.