304L不锈钢法兰酸洗腐蚀失效分析  

Failure Analysis on Acid Pickling Corrosion of 304L Stainless Steel Flange

作　　者：许万剑 杨春丽 刘斌 赵宏柱 石永新 XU Wanjian;YANG Chunli;LIU Bin;ZHAO Hongzhu;SHI Yongxin(National Stainless Steel Quality Supervision and Inspection Center(Xinghua),Taizhou 225721,China;Institute of Materials,Shanghai University,Shanghai 200072,China)

机构地区：[1]国家不锈钢制品质量监督检验中心(兴化),江苏泰州225721 [2]上海大学材料研究所,上海200072

出　　处：《热加工工艺》2022年第5期158-161,共4页Hot Working Technology

摘　　要：304L不锈钢法兰与不锈钢管焊接后在酸洗过程中发生腐蚀失效。采用宏观检验、化学成分分析、金相检验、SEM、热处理模拟等方法,对该法兰中孔处的腐蚀现象进行分析。结果表明,法兰中孔处在焊接后存在晶间敏化,严重降低了法兰的耐晶间腐蚀性能,从而导致法兰中孔焊缝及附近在酸洗过程中发生晶间腐蚀减薄。Corrosion failure was found in the course of acid pickling after welding of a flange with a pipe.The corrosion phenomenon at the central hole of the flange was analyzed by means of macroscopic examination,chemical composition analysis,metallographic examination,SEM analysis,heat treatment simulation.The results show that intergranular sensitization is found on the central hole of the flange after welding,the resistance to intergranular corrosion of the flange is seriously weakened and it finally causes the intergranular corrosion thinning in the course of acid picking.

关 键 词：304L不锈钢 法兰 焊接 酸洗 晶间腐蚀 

分 类 号：TG441.7[金属学及工艺—焊接]