Patent ID: 8182740
Filing Date: 2012-05-22
Classification: B21B,C21D,C22C

Abstract:
1. High-strength steel sheet excellent in hole-expandability and ductility, consisting of, in mass %, C: not less than 0.01% and not more than 0.20%, Si: not more than 1.5%, Al: from 0.45% to 1.5%, Mn: not less than 0.5% and not more than 3.5%, P: not more than 0.2%, S: not less than 0.0005% and not more than 0.009%, N: not more than 0.009%, Mg: not less than 0.0006% and not more than 0.01%, O: not more than 0.005% and Ti: not less than 0.01% and not more than 0.20% and/or Nb: not less than 0.01% and not more than 0.10%,