摘要
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。
The nature and causes of the cracks in ethylene- propylene rubber unit unit piping,heat exchangers and other parts were studied. The pipeline and equipment manufactured by 304 austenitic stainless steel,duplex stainless steel 2205 or 2507. Results for metallurgical,fracture,spectroscopy tests pointed 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 reduce the amounts of harmful Cl-in the media; control of welding and forming stress.
出处
《压力容器》
2015年第3期50-58,共9页
Pressure Vessel Technology
关键词
乙丙橡胶装置
裂纹性质与成因
控制与防治技术
ethylene propylene rubber unit
the nature and causes of crack
control and prevention technology
