SA387压力容器用铬钼合金钢板等级：2.12.11.22.21.5.9.91.91LSA387主要化学成分级别CMnSiPSCrMoGr5Cl2≤0.150.30-0.60≤0.50≤0.035≤0.0354.00-6.000.45-0.65Gr12Cl20.05-0.170.40-0.650.15-0.40≤0.035≤0.0350.80-1.150.45-0.60Gr11Cl20.05-0.170.40-0.650.50-0.80≤0.035≤0.0351.00-1.500.45-0.60Gr22Cl20.05-0.150.30-0.60≤0.50≤0.035≤0.0352.00-2.500.90-1.10Gr910.06-0.150.25-0.660.18-0.56≤0.020≤0.0108.00-9.500.85-1.05SA387机械性能等级、级别钢板状态屈服强度σ0.2(MPa)抗拉强度σb(MPa)延伸率δ2%Gr5Cl2正火+回火≥310515-690≥18Gr12Cl2正火+回火≥275450-585≥22Gr11Cl2正火+回火≥310515-690≥22Gr22Cl2正火+回火≥310515-690≥18Gr.91正火+回火≥415)