17Cr铁素体不锈钢焊接材料的选择及应用OA

The most commonly used ferritic stainless steel is AISI430,which usually contains 17%Cr and 0.05%～0.12%C.Weldability of the steel is generally considered to be worse than that of austenitic stainless steel due to coarsening of joint grains and generation of intergranular martensite during welding process,which leads to degradation of joint toughness and ductility and welding cracks.Improving toughness and ductility of joints as welded is a topic of great concern for the type of steel.The main problems of weldability of 17%Cr ferritic stainless steel are analyzed,and selection principle of"composition matching"or"quasi-composition matching"is summarized.Composition of former weld is basically the same or slightly higher than that of base metal,while composition of the latter weld is quite different from that of base metal(alloy system is the same or close,but composition is quite different).The kinds and process methods of welding consumables of 17%Cr ferritic stainless steel are summarized,and five engineering application examples are listed.Results show that tensile strength of welded joints with"component matching"or"quasi-component matching"basically meets requirements,and toughness and ductility of joints need to be improved;disimilar weld joints are insensitive to intergranular corrosion.Fatigue properties of two kinds of similar weld joints are basically the same as those of base metal.Results of review provide theoretical reference for innovation and development of 17%Cr ferritic stainless steel welding consumables,supporting process and engineering quality improvements.