炼化装置奥氏体不锈钢连多硫酸应力腐蚀开裂分析

doi:10.3969/j.issn.1006-8805.2023.03.010

Petro-chemical Equipment Technology ›› 2023, Vol. 44 ›› Issue (3): 45-49.doi: 10.3969/j.issn.1006-8805.2023.03.010

• CORROSION AND PROTECTION • Previous Articles

On Stress Corrosion Cracking of Austenitic Stainless Steel with Polysulphuric Acid in Refining and Chemical Units

Hu Jia

Cangzhou Refining and Chemical Company, SINOPEC, Cangzhou, Hebei, 061000

Received:2023-02-18 Accepted:2023-04-30 Online:2023-05-15 Published:2023-06-06

Abstract

Abstract: Stress corrosion cracking (SCC) of austenitic stainless steel is a kind of corrosion failure frequently occurring during shutdown and maintenance of refining and chemical units. In recent years, with the continuous material upgrading of refining and chemical units, austenitic stainless steel is increasingly applied and the failure cases of stress corrosion cracking of austenitic stainless steel are more and more common. This paper summarized and analyzed the occurrence conditions, corrosion characteristics, development process and influencing factors of stress corrosion cracking of polysulphuric acid. It discussed the feasible protective measures against stress corrosion cracking of polysulphuric acid in refining and chemical units. The paper also analyzed and expounded several problems related to stress corrosion cracking of polysulphuric acid.

Key words: refinery and chemical unit, austenitic stainless steel, polythionic acid, stress corrosion cracking/SCC, sensitization

Hu Jia. On Stress Corrosion Cracking of Austenitic Stainless Steel with Polysulphuric Acid in Refining and Chemical Units[J].Petro-chemical Equipment Technology, 2023, 44(3): 45-49.

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On Stress Corrosion Cracking of Austenitic Stainless Steel with Polysulphuric Acid in Refining and Chemical Units

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