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HIGH STRENGTH STRUCTURAL STEEL OF TENSILE STRENGTH OF 650MPA GRADE WITH LOW YIELD RATIO AND METHOD OF MANUFACTURING THE HIGH STRENGTH STRUCTURAL STEEL
HIGH STRENGTH STRUCTURAL STEEL OF TENSILE STRENGTH OF 650MPA GRADE WITH LOW YIELD RATIO AND METHOD OF MANUFACTURING THE HIGH STRENGTH STRUCTURAL STEEL
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机译：屈服比低的650MPA等级高强度结构钢及其制造方法
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摘要
PURPOSE: A high-strength structural steel material having a low yield ratio and 650 MPa tensile strength and a manufacturing method thereof are provided to improve tensile strength by controlling cooling conditions after hot rolling. CONSTITUTION: A high-strength structural steel material having a low yield ratio and 650 MPa tensile strength comprises carbon 0.1-0.15 weight%, silicon 0.3-0.5 weight%, manganese 1.2-1.5 weight%, phosphorus less than 0.03 weight%, sulfur less than 0.015 weight%, vanadium 0.04-0.06 weight%, titanium 0.01-0.03 weight%, boron 0.04-0.06 weight%, niobium 0.035-0.045 weight%, nitrogen less than 0.015 weight%, iron and inevitable impurities. The tensile strength of the structural steel material is over 650MPa, and the yield strength is over 400 MPa.
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