在役不锈钢复合钢板晶间腐蚀失效分析  

Failure analysis of Intergranular Corrosion of Stainless Steel Composite Steel Plate in Service

作　　者：董伟雄 李涌泉[2] DONG Weixiong;LI Yongquan

机构地区：[1]绍兴市特种设备检测院,绍兴市312071 [2]中国特种设备检测研究院

出　　处：《化工装备技术》2020年第6期1-4,共4页Chemical Equipment Technology

摘　　要：对某化肥厂进行压力容器定期检验时,发现几台相同厂家的压力容器不锈钢复合钢板覆层具有大量表面裂纹。以循环气分离器为例进行分析,通过晶相组织、介质成分以及热处理分析后可知,由于覆层与基层在550℃条件下进行消应力热处理,而该温度处于不锈钢覆层晶间腐蚀敏化区间内,从而导致了钢板产生晶间腐蚀。通过对奥氏体不锈钢腐蚀影响因素进行分析,选用0Cr18Ni9,00Cr19Ni10,0Cr18Ni10Ti试件进行与案例相同条件的热处理和不锈钢晶间腐蚀试验,结果显示00Cr19Ni10和0Cr18Ni10Ti更适合该工况。During the regular inspection of the pressure vessel of a chemical fertilizer plant,it was found that several pressure vessels of the same manufacturer had a large number of surface cracks in the stainless steel composite plate cladding.Take the circulating gas separator as an example for analysis,after analyzing the crystal structure,medium composition and heat treatment,it could be known that the coating and the base layer were subjected to stress relief heat treatment at 5500 C,and the temperature was at the intergranular corrosion sensitization of the stainless steel coating in the interval,resulting in intergranular corrosion of the steel plate.Through the analysis of the factors affecting the corrosion of austenitic stainless steel,0Cr18Ni9,00Cr19Ni10,0 Cr18Ni10Ti specimens were selected to conduct heat treatment and stainless steel intergranular corrosion tests under the same conditions as the case.The results showed that 00 Cr19 Ni10 and 0Cr18Ni10Ti were more suitable for this working condition.

关 键 词：不锈钢复合钢板 晶间腐蚀 热处理 

分 类 号：TG172[金属学及工艺—金属表面处理]