CAJ | 학술논문

对乙丙橡胶装置管线、换热器等部位出现的裂纹的性质及成因进行了试验分析。管线和设备由304奥氏体不锈钢或2205，2507双相不锈钢制作。金相、断口、能谱等试验结果表明，上述裂纹属于氯离子引发的应力腐蚀开裂（SCC）。其原因是介质中含有较多难于消除的氯化物，并含有水或水蒸气；运行温度70～200℃（引发SCC敏感的温度范围）；焊接热和焊接残余应力、加工残余应力。探讨了防止乙丙橡胶装置氯化物SCC的技术途径：尽量控制介质中氯离子含量；相关设备选用铁素体类结构钢（如20＃），2507双相不锈钢或高镍合金（如C2000）制作；控制焊接和成形加工应力。
대을병상효장치관선、환열기등부위출현적렬문적성질급성인진행료시험분석。관선화설비유304오씨체불수강혹2205，2507쌍상불수강제작。금상、단구、능보등시험결과표명，상술렬문속우록리자인발적응력부식개렬（SCC）。기원인시개질중함유교다난우소제적록화물，병함유수혹수증기；운행온도70～200℃（인발SCC민감적온도범위）；한접열화한접잔여응력、가공잔여응력。탐토료방지을병상효장치록화물SCC적기술도경：진량공제개질중록리자함량；상관설비선용철소체류결구강（여20＃），2507쌍상불수강혹고얼합금（여C2000）제작；공제한접화성형가공응력。
The nature and causes of the cracks in ethylene -propylene rubber unit unit piping,heat ex-changers and other parts were studied.The pipeline and equipment manufactured by 304 austenitic stain-less steel,duplex stainless steel 2205 or 2507.Results for metallurgical,fracture,spectroscopy tests point-ed out that these cracks are caused by chloride ion stress corrosion cracking (SCC ).Due to:a medium containing more difficult to eliminate the chlorides and water or water vapor;operating temperature of 70~200℃(sensitive temperature range);weld heat and weld residual stress and residual stress processing. Discussed the technical ways EPR unit prevention of chloride SCC:related equipment selection of ferritic steel (eg 20#),2507 duplex stainless steel or high nickel alloys (such as C2000)production;try to re-duce the amounts of harmful Cl-in the media;control of welding and forming stress.