High tensile strength high toughness low yield ratio bainite steel and its production method

The invention relates to high tensile strength high toughness low yield ratio bainite steel and its manufacturing method. Its compositions (Wt%) are C 0.015%-0.08%, Si 0.26%-0.46%, Mn 1.5%-1.7%, Nb 0.015%-0.060%, Ti 0.005%-0.03%, B 0.0005%-0.003%, Mo 0.2%-0.5%, Cu 0.4%-0.6%, Ni 0.26%-0.40%, Al 0.015...

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1. Verfasser: GONGLI,HE YU
Format: Patent
Sprache:eng
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Zusammenfassung:The invention relates to high tensile strength high toughness low yield ratio bainite steel and its manufacturing method. Its compositions (Wt%) are C 0.015%-0.08%, Si 0.26%-0.46%, Mn 1.5%-1.7%, Nb 0.015%-0.060%, Ti 0.005%-0.03%, B 0.0005%-0.003%, Mo 0.2%-0.5%, Cu 0.4%-0.6%, Ni 0.26%-0.40%, Al 0.015%-0.05%, rest Fe and other inevitable impurity. TMCP+RPC+SQ method is adopted to make tensile strength 800N/mm2 steel plate yield ratio less than 0.85, and greatly improve steel plate low temperature toughness at the same time. The technique is stable, strong operability, low cost, and high performance. The steel turning temperature is under¿C60 centigrade degree. Its welding technique is simple. Forming is good. And it can widely apply in bridge, building construction, and engineering machinery field, and etc.