00Cr_(18)Ni_(14)Mo_2Cu_2不锈钢耐海水腐蚀焊接工艺分析

Seawater corrosion-resistant welding procedure of 00Cr_(18)Ni_(14)Mo_2Cu_2 stainless steel

研究了00Cr18Ni14Mo2Cu2奥氏体不锈钢耐海水腐蚀的焊接工艺,通过改进焊接工艺,减小了热影响区宽度,减少了热影响区与焊缝金属化学成分的差异,细化了热影响区金相组织,控制了热影响区σ相析出.结果表明,热影响区腐蚀速率减小,且焊接接头(焊缝、热影响区和母材三者同时暴露在腐蚀介质中)腐蚀速率明显减小,大大提高了该钢焊缝区域的耐海水腐蚀性能.

In this paper,seawater corrosion-resistant welding procedure of 00Cr18Ni14Mo2Cu2 austenitic stainless steel was studied.With the improvement of welding procedure,width of heat-affected zone(HAZ) was reduced,difference of chemical constitution between HAZ and fusion zone(FZ) was minished,metallurgical structure of HAZ was refined,precipitate of Fe-Cr phase(σ phase) was controlled.The corrosion rate of HAZ was decreased and corrosion rate of weld joint(FZ,HAZ and base metal was emerged in corrosion liquor at the same time) was greatly decreased.