Steel plate excellent in brittle crack propagation stop property and toughness at the center of plate thickness and method for producing the same

摘要

A steel sheet excellent in brittle crack propagation suspension and a method for producing the same are provided to improve the base material toughness of the board thickness central part by appropriately prescribing each crystallographic orientation relation. A steel sheet comprises next: C: 0.06% through 0.01 ([Mass %] It is meaning. Hereinafter it is identical about the chemical composition) Si: 0.8% through 0.01 Mn: 1.8% through 1.0 Al: 0.08% through 0.01 Nb: with 0.08% through 0.02 Ni: 0.8% through 0.20 is contained.