马氏体耐热钢P91Φ336mm×31mm管材焊接接头的组织和力学性能

摘要

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,≤0.015Al,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Rpn2 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.