钢材可以按屈服极限分类:低碳深拉延钢的屈服极限Rp0.2 < 180 Mpa。高强度钢(CHSS High
Strength Steel)是指屈服极限为180 MPa至300 Mpa的钢材。较高强度钢(Advanced High
Strength Steel AHSS)是指屈服极限为300 MPa至600 Mpa的钢材。最高强度钢(Ultra High
Strength Steel UHSS)的屈服极限为Rp0.2 大于等于600 Mpa。取代传统的钢板