Nb-CrX80管线钢管焊接接头断裂韧性的研究
尹长华;王建国;姚登樽
【期刊名称】《焊管》 【年(卷),期】2011(034)009
【摘要】The Nb-Cr X80 line pipe and fracture toughness of its welding joint were studied at low temperature. It was found that for Nb-Cr X80 pipeline steel, the anti-cracking performance of the base metal is better than that of HAZ, while the cracking performance of longitudinal weld is between base metal and HAZ. For circumferential welding joint deposited by KOBE LB52U φ 3.2 mm upward (for root pass)+HOBART X80 φ 2.0 mm self shielded flux-cored wire downward (for fill, and cap passes), the anti-cracking performance of NQ direction is better than that of NP direction. However, for HAZ, the anti-cracking performance of NQ direction is worse than that of NP direction. In the case of welding joints deposited by KOBE LB52U φ 3.2 mm upward (for root pass)+JC-30 φ 2.0 mm self shielded flux-cored wire downward(for fill, and cap passes) ,for NQ direction ,both the average value of CTOD of weld metal and HAZ are better than that of NP direction. This indicates anti-cracking performance in NQ direction is better.%对低温环境下Nb-Cr X80管线钢管及其焊接接头的断裂韧性进行了深入研究.研究发现,Nb-Cr X80管线钢母材的抗开裂性能要优于热影响区,纵焊缝介于二者之间.对于KOBE LB52Uφ3.2 mm低氢焊条上向根焊+HOBART X80φ2.0 mm自保护药芯焊丝
Nb-CrX80管线钢管焊接接头断裂韧性的研究
