双相不锈钢在氯化物介质中具有良好的耐点蚀性、耐缝隙腐蚀性和耐应力腐蚀裂纹件。它广泛应用于化工厂的热交换器和海水浓缩器。但在不锈钢奥氏体中焊接时。由于靠近卫树技状结晶组织的焊接金属部位和焊接部位，故存在着热影响区域。当温度达到门SOT以上，该区域的晶粒明显粗化 Duplex stainless steel has good pitting resistance, crevice corrosion resistance and stress corrosion cracking resistance in chloride media. It is widely used in chemical plant heat exchangers and seawater concentrators. But in the stainless steel austenitic welding. Due to close to tree-like technology of crystalline structure of the welded metal parts and welding parts, so there is a heat affected zone. When the temperature reaches above the gate SOT, the grain of this area is significantly roughened