High strength steel sheet which has excellent ability of training and process for manufacture of the same

摘要

High strength steel sheet which has excellent ability of training and process for manufacture of the same. The invention relates to a sheet of high strength steel and a steel sheet coated with a good ability of training with elongation in the limit reduced after ageing and a production process advantages of the same.The sheet of high strength steel which has excellent ability of training, which comprises a composition comprising in mass%, C: 0.05% to 0.20%; Si: 0.10% or less; Mn: 0.2% to 1.7%; P = 0.10% or mednor; s: 0.10% or less; al. 0.01% to 0.10%; N: 10% or less and the rest with The Fe and incidental impurities, which provided that [% w] represents the content (% by weight) of element M in the steel.[% Mn] / [% C] 242 2.0 and the steel sheet has a tensile strength (TS) of at least 390 MPa, elongation (EL) of at least 30% and elongation in the limit (YP - EL) after ageing not more than 1.0%.