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

汤镇华, 刘希武, 李辉, 刘旭霞, 张若曦

doi:10.16577/j.issn.1001-1560.2024.0262

材料保护 >

2024 , Vol. 57 >Issue 11: 172 - 177

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0262

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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

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中石化炼化工程(集团)股份有限公司洛阳技术研发中心

汤镇华(1996－)，中级工程师，主要研究方向为材料与防腐领域、化工与新能源腐蚀与防护，电话:15838908889 ，E-mail:584092170＠qq.com

收稿日期: 2024-01-07

修回日期: 2024-06-06

录用日期: 2024-06-07

网络出版日期: 2024-12-23

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

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(SINOPEC Engineering Group Luoyang R＆D Center of Technology，Luoyang 471003，China)

TANG Zhenhua(1996－)，Intermediate Engineer，Research Focus: Materials and Anti-Corrosion Field ，Chemical and New Energy Corrosion and Protection，Tel.:15838908889 ，E-mail:584092170＠qq.com

Received date: 2024-01-07

Revised date: 2024-06-06

Accepted date: 2024-06-07

Online published: 2024-12-23

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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。

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

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汤镇华, 刘希武, 李辉, 刘旭霞, 张若曦 . 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[J]. 材料保护, 2024 , 57(11) : 172 -177 . DOI: 10.16577/j.issn.1001-1560.2024.0262

Abstract

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.

Key words： ethylene oxide refining tower; slow stretching; sensitization; 304 and 304L; sensitivity to stress corrosion cracking

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