L245A级钢管在湿H_2S环境下的氢致开裂(HIC)与硫化物应力腐蚀开裂(SSCC)试验研究

管线钢在湿H2S环境下运行必须考虑其抗氢致开裂(HIC)和硫化物应力腐蚀开裂(SSCC)性能,因此,在确保L245A级钢管力学性能合格的前提下,根据NACETM0284—2003和NACETM0177—2005标准,按照L245A级钢管及焊缝所处的不同介质浓度和运行压力设计了8组试验。通过降低介质浓度和运行压力对L245A级钢管在湿硫化氢环境下的抗氢致开裂性能和硫化物应力腐蚀开裂性能(SSCC)进行了试验评定;通过4组试验得出:L245A级钢管在标准湿H2S环境下不会产生氢致开裂,发生硫化物应力腐蚀开裂,在设计条件和工作条件下不发生应力腐蚀开裂的结论。同时笔者对管道在湿H2S环境下的安全运行提出了建议。

Experimental Study on Resistance of L245A-steel Pipe to HIC and SSCC in Wet H2S Environment

The anti-hydrogen-induced cracking (HIC) and sulfide stress corrosion cracking (SSCC) performance of pipeline in wet H2S environment must be considered to ensure its safety. To measure the resistance of pipeline to HIC and SSCC, under the premise of ensuring the mechanical properties of L245A-pipe, 8 groups of experiment with different medium concentrations and operational pressure was made according to NACE TM 0284—2003 and NACE TM 0177—2005 standards. It is concluded from four groups of experiment that L245A-pipe in standard wet H2S environment does not produce HIC, but produce SSCC. Meanwhile, under the circumstance of design condition and working condition, no stress corrosion cracking produces. Finally, suggestions are put forward about the safety operation of pipeline in wet H2S environment.