小口径オーステナイト系ステンレス鋼管のSCC亀裂進展評価と検査要求の検討

抄録

This paper describes the first inservice inspection time and subsequent inspection interval for small bore austenitic stainless steel pipes. Estimating weld residual stress of small bore pipes (100A and 150A pipes in JIS standard), and crack growth behavior was examined based on the weld residual stress. The postulated initial crack takes more than 35 years to penetrate the pipe wall. From these crack growth analyses, the initial inspection should be performed at 10 years from the start of service, and the subsequent inspections should be performed every 10 years.