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Is superior in extension and extension flange property the tensile strength which above 780MPa the high intensity hot rolling steel sheet and its production mannered
Is superior in extension and extension flange property the tensile strength which above 780MPa the high intensity hot rolling steel sheet and its production mannered
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机译:高强度热轧钢板在延伸和延伸凸缘性能方面均优于780MPa以上的抗拉强度
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摘要
PROBLEM TO BE SOLVED: To provide a high strength hot rolled steel sheet having excellent elongation properties and stretch-flange properties and a method for producing the same, wherein TS of ≥780 MPa is stably obtained at a low cost, and a method for producing the same.;SOLUTION: The high strength hot rolled steel sheet with a tensile strength of ≥780 MPa has a composition composed of, by mass, 0.06 to 0.15% C, ≤1.2% Si, 0.5 to 2.0% Mn, ≤0.04% P, ≤0.005% S, ≤0.05% Al and 0.03 to 0.15% Ti, and the balance Fe with inevitable impurities, and has a microstructure in which the volume ratio of the total of a bainite phase and a bainitic ferrite phase occupied in the whole of the structure is ≥50%, and the volume ratio of the total of the bainite phase, bainitic ferrite phase and polygonal ferrite phase is ≥95%, wherein the total of the content of the Ti in precipitates with the average diameter of 20 nm is ≥50% of the total of the content of the Ti in all the precipitates precipitated in the steel.;COPYRIGHT: (C)2011,JPO&INPIT
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