Invention Grant
US08911567B2 High-strength steel sheet having excellent processability and paint bake hardenability, and method for producing of high-strength steel sheet 有权
优异的加工性和油漆烘烤硬化性的高强度钢板以及高强度钢板的制造方法

High-strength steel sheet having excellent processability and paint bake hardenability, and method for producing of high-strength steel sheet
Abstract:
The high-strength steel sheet includes, by mass %: C: 0.01% to 0.10%; Si: 0.15% or less; Mn: 0.80% to 1.80%; P: 0.10% or less; S: 0.015% or less; Al: 0.10% to 0.80%; Cr: 0.01% to 1.50%; N: 0.0100% or less; and a balance consisting of iron and inevitable impurities, in which a metallic structure is composed of ferrite and a hard second phase, the area fraction of the ferrite is 80% or more, the area fraction of the hard second phase is 1% to 20%, the fraction of unrecrystallized ferrite in the ferrite is less than 10%, the ferrite grain sizes are 5 μm to 20 μm, and the fraction of the ferrite crystal grains having an aspect ratio of 1.2 or less in the entire ferrite crystal grains is 60% or more.
Information query
Patent Agency Ranking
0/0