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化学成份
碳 C :0.47~0.55
硅 Si:≤0.40
锰 Mn:0.70~1.10
硫 S :≤0.030
磷 P :≤0.030
铬 Cr:0.90~1.20
镍 Ni:≤0.35
铜 Cu:≤0.25
钒 V :0.10~0.25
力学性能
抗拉强度 σb (MPa):≥1274(130)
屈服强度 σs (MPa):≥1127(115)
伸长率 δ5 (%):≥10
断面收缩率 ψ (%):≥40
硬度 :热轧,≤321HB;冷拉+热处理,≤321HB
热处理规范及金相组织
热处理规范:淬火850℃±20℃,油冷; 回火500℃±50℃(特殊需要时,±30℃)。
●交货状态:热轧钢材以热处理或不热处理状态交货,冷拉钢材以热处理状态交货。 