Steel sheets for porcelain enameling and method of producing the same.

摘要

A steel sheet for porcelain enameling having improved press formability and enameling properties comprising not more than 0.0025% of C, not more than 0.50% of Mn, 0.007-0.020% of B, 0.01-0.07% of Cu, not more than 0.010% of Al, 0.008-0.020% of O, 0.005-0.020 wt% of N, not more than 0.020 wt% of P, and the balance being Fe and inevitable impurities. Up to 0.050 wt% of Ti and/or Nb can further be added to the steel, provided that the total amount of Ti and Nb does not exceed 0.050 wt%; in this case, the upper limit for C is increased to 0.0050 wt%. The steel is produced by hot rolling a slab of steel having a chemical composition as mentioned above as a starting material, cold rolling the resulting hot rolled sheet at a reduction of not less than 70%, and then subjecting the resulting cold rolled sheet to a continuous annealing at a temperature of not lower than 800 DEG C but not higher than Ac3 transformation point.