C-276合金冷金属过渡焊接焊缝熔敷金属耐蚀性研究

摘要

C-276合金在氧化性和非氧化性酸中都具有很好的耐腐蚀性，所以在精对苯二甲酸（PTA）装置中应用较多。在化工容器设计时，虽然没有明确规定哪些场合使用复合板或堆焊，但是，考虑到堆焊层是铸造枝晶状奥氏体组织，复合板是轧制孪晶奥氏体组织，而且堆焊的热过程比复合的热过程复杂。以C-276钢板为参考，研究了C-276合金冷金属过渡（CMT）焊接焊缝熔敷金属的耐蚀性，供PTA装置制造厂参考。%C-276 alloy has good corrosion resistance in oxidizing and non-oxidizing acids,so it is wide-ly used in purified terephthalic acid(PTA)device.In the chemical vessel design,it does not specify the using of composite board or surfacing.Considering the surfacing layer microstructure is dendritic austen-ite,the composite board microstructure is twinned austenite,and the thermal process of welding is complex than that of composite.We have study C -276 weld metal corrosion resistance after cold metal transfer (CMT)welding,which is useful for PTA device fabrication.