某炼厂环氧乙烷/乙二醇装置中304和304L的应力腐蚀敏感性研究  

Study on Stress Corrosion Sensitivity of 304 and 304L in the Ethylene Oxide/Ethylene Glycol Unit of a Certain Refinery

作　　者：汤镇华 刘希武 李辉 刘旭霞 张若曦 TANG Zhenhua;LIU Xiwu;LI Hui;LIU Xuxia;ZHANG Ruoxi(SINOPEC Engineering Group Luoyang R&D Center of Technology,Luoyang 471003,China)

机构地区：[1]中石化炼化工程(集团)股份有限公司洛阳技术研发中心,河南洛阳471003

出　　处：《材料保护》2024年第11期172-177,共6页Materials Protection

摘　　要：环氧乙烷(EO)是一种仅次于聚乙烯和聚氯乙烯的重要有机合成原料,主要用于生产乙二醇(EG)。EO/EG装置的SD工艺(美国SD公司的EO/EG专利技术)存在典型的应力腐蚀问题。为此,模拟了炼厂304和304L材质在EO精制塔等典型环境的腐蚀情况及规律,通过慢拉伸试验,评价了2种材质的应力腐蚀开裂敏感性。结果表明:EO/EG装置的应力腐蚀与不锈钢的敏化有关,敏化后的304和304L产生应力腐蚀开裂敏感性。给出了对应的材料和工艺优化等措施改进,为EO/EG装置的安稳运行提供了技术保障。Ethylene oxide(EO) is a crucial organic synthesis raw material, ranking just behind polyethylene and polyvinyl chloride, and is primarily used in the production of ethylene glycol(EG).The SD process for EO/EG units(a patented EO/EG technology from SD Company in the United States) suffers from typical stress corrosion problems. To address this, the corrosion behavior and mechanisms of refinery-grade 304 and 304L materials in typical environments such as EO purification towers were simulated. Stress corrosion cracking susceptibility of the two materials was evaluated through slow strain rate testing. Results showed that the stress corrosion in EO/EG units was associated with the sensitization of stainless steel, with sensitized 304 and 304L stainless steel exhibiting susceptibility to stress corrosion cracking. Corresponding measures for material and process optimization were proposed, providing technical support to enhance the safe and stable operation of EO/EG units.

关 键 词：环氧乙烷精制塔 慢拉伸 敏化 304和304L 应力腐蚀开裂敏感性 

分 类 号：TG172[金属学及工艺—金属表面处理]