Invention Grant
US08486205B2 High strength hot rolled steel sheet excellent in bore expanding workability and method for production thereof 有权
孔膨胀加工性优异的高强度热轧钢板及其制造方法

High strength hot rolled steel sheet excellent in bore expanding workability and method for production thereof
Abstract:
A high-strength hot-rolled steel sheet containing C: 0.05 to 0.15%, Si: no more than 1.50% (excluding 0%), Mn: 0.5 to 2.5%, P: no more than 0.035% (excluding 0%), S: no more than 0.01% (including 0%), Al: 0.02 to 0.15%, and Ti: 0.05 to 0.2%, which is characterized in that its metallographic structure is composed of 60 to 95 vol % of bainite and solid solution-hardened or precipitation-hardened ferrite (or ferrite and martensite) and its fracture appearance transition temperature (vTrs) is no higher than 0° C. as obtained by impact tests (% in terms of % by weight).
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