Patent ID: 8876987
Filing Date: 2014-11-04
Classification: C21D,C22C,C23C,Y10S,Y10T

Abstract:
1. A high strength steel sheet comprising a chemical composition including, in mass %, C: 0.10% or more and 0.59% or less, Si: 3.0% or less, Mn: 0.5% or more and 3.0% or less, P: 0.1% or less, S: 0.07% or less, Al: 3.0% or less, N: 0.010% or less, and the balance being Fe and incidental impurities, wherein a relation [Si %]+[Al %]=0.7% or more is satisfied (where [X %] indicates mass % of element X), wherein the steel sheet has a microstructure such that: