摘要
1Cr5Mo钢在石油化工高温环境中应用广泛,但长期服役后异质焊接接头的碳迁移及蠕变损伤问题亟待评估。针对服役20年的1Cr5Mo管道,通过化学成分分析、金相检验及650℃时效模拟试验,揭示了碳迁移与时间、温度的关联规律,并结合Larson-Miller参数法与双对数外推法预测剩余寿命(约17年)。结果表明,脱碳层宽度达100μm的接头仍满足力学性能要求,为同类管道的安全评估提供了数据支撑。
1Cr5Mo steel is widely used in high-temperature petrochemical applications.However,the long-term performance of its dissimilar welded joints,particularly concerning carbon migration and creep damage,remains a critical reliability concern.This study presented a systematic evaluation of 20-year-serviced 1Cr5 Mo pipelines through compositional analysis,metallography,and accelerated aging tests at 650℃.The correlation between carbon migration and time-temperature conditions was revealed,and the residual life was predicted as approximately 17 years using Larson-Miler parameter modeling and double logarithmic extrapolation.The results indicate that joints with a decarburized layer width of up to 100µm still meet mechanical performance requirements,providing novel data support for the safety assessment of similar pipelines.
作者
张磊
周永强
ZHANG Lei;ZHOU Yongqiang(SINOPEC Jinling Company,Nanjing 210033,China)
出处
《石油化工腐蚀与防护》
2025年第6期18-24,共7页
Corrosion & Protection In Petrochemical Industry
