Patent ID: 7955444
Filing Date: 2011-06-07
Classification: C21D,C22C,C23C,Y10T

Abstract:
1. A high tensile steel sheet comprising more than 0.11% and not more than 0.24% C, 0.3% or less Si, 0.5 to 2.0% Mn, 0.06% or less P, 0.005% or less S, 0.06% or less Al, 0.006% or less N, 0.05 to 0.5% Mo, 0.03 to 0.2% Ti, more than 0.20% and not more than 1.2% V, by mass, and a balance of Fe and inevitable impurities, and consisting essentially of a ferrite single phase structure, having a tensile strength of 1100 MPa or higher, wherein the steel contains a carbide containing Ti, Mo, and V, and having smaller than 10 nm of an average particle size precipitates in a dispersed state, and the carbide containing Ti, Mo, and V has an average composition satisfying [V/(Ti+Mo+V)≧0.3], wherein Ti, Mo, and V are expressed by atomic %.