20#钢管化学成分● 化学成分:碳C:0.17~0.23硅Si:0.17~0.37锰Mn:0.35~0.65硫:≤ 0.035磷P:≤ 0.035铬铬:≤ 0.25镍镍:≤ 0.25铜铜:≤ 0.25● 机械性能:抗拉强度σB(MPA):≥ 410(42)屈服强度σS(MPA):≥ 245(25)伸长率δ5(%):≥ 25断面收缩率ψ(%):≥ 5、硬度:无热处理,≤ 156hb,样本量:样本量25mm● 热处理规范和金相组织:热处理规范:正火,910℃,风冷。金相组织:铁素体+珠光体。● 交货状态:交货应处于无热处理或热处理(退火、正火或高温回火)状态。如果要求在热处理状态下交货,…
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