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首页> 美国政府科技报告 >Assessment of Center-Line Lack of Penetration in Stainless Steel Pipe (ASTM A-312, ASME SA-312).
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Assessment of Center-Line Lack of Penetration in Stainless Steel Pipe (ASTM A-312, ASME SA-312).

机译：评估不锈钢管中心线缺乏渗透性（asTm a-312，asmE sa-312）。

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摘要

This report summarizes results of a testing and evaluation program aimed at establishing the detectability of and severity of Centerline Lack of Penetration (C.L.P.) in stainless steel pipe manufactured in accordance with ASTM A-312 and ASME SA-312 procedures. Examination was performed on pipe sections supplied by US NRC. Weld conditions were checked by etching ends of pipe samples and by metallographic examination. Ultrasonic inspection techniques were utilized to explore the possibility of N.D.E. for CLP condition. Metallographic examination has shown some diffusion bonding across the interface (at lack of penetration), which would increase joint strength and reduce detectability via ultrasound. Other laboratories (APTECH Engineering Services) have studied the CLP problem with regard to material performance (safety margin and remaining fatigue life) and have found large margins of safety in existing pipe. As a result of these evaluations and the current study, the removal of installed SA-312 pipe is considered to be an overly cautious measure. As a result of this study, the removal of installed A-312 and SA-312 stainless steel piping is considered to be an overly cautious measure.

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