利用化学分析，金外、ＳＥＭ、ＳＡＭ和ＥＳＣＡ等技术对１８－８型不锈钢制成的催化裂化装置膨胀长节波纹管的失效原因进行了调查，结果表明，大约有８０５的波纹管是由Ｃｌ引卢的ＳＣＣ所致不规范的安装经起的残余拉应力水平是确定波纹管运行寿命的关键因素，采用消除应力退火，表面改性，用２新型不钢等措施能有效地提高波纹管的使用寿命。
In the paper the analysis results of 29 failed 18-8SS bellows for catalytic crack- ing device were summerized. The analysis was performed by means of various techniques in- cluding chemical analysis, metallography ,SEM, SAM and ESCA. The results showed that near by 80% of the bellow failures resulted from stress corrosion crack (SCC) due to chlo- rine ion; The magnitude of residual stress resulted from improper design and installation, which limiled strongly the lifetime of the bellows service. The protective measures such as annealing for stress-relieving ,surface modification and application of new alloy (FN) have been taken and outstanding economical benefit has been obtained.
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