马氏体耐热钢P91 Φ336mm×31mm管材焊接接头的组织和力学性能

通过ER90S-B9焊丝和焊条（/%：0.08~0.12C,0.4~0.6Si,0.5~1.4Mn,8.5~10.5Cr,0.85~1,15Mo,0.18~0.29V,0.06~0.10Nb,≤0.015A1,0.03~0.07N）对P91钢管（/%：0.09C,0.45Si,0.32Mn,8.9Cr,0.95Mo,0.21V,0.78Nb,0.014Al,0.05N）进行氩弧焊打底、焊条电弧焊填充及盖面焊接。结果表明,P91钢焊缝无裂纹、夹渣、弧坑、气孔等缺陷,焊缝组织为回火索氏体,部分区域为回火马氏体,母材和热影响区为回火索氏体;接头的抗拉强度Rm653~665 MPa,屈服强度Rp0.2 497~504 MPa,伸长率A 21.8%~22.9%,冲击功63.8~77.2 J,均满足GB5310-2008及AMSE SA335-2007标准要求。