Failure analysis of austenitic stainless steel AISI 304 Exhaust bag filter at Sanati Dodefam Co.

Alijani, Fatemeh; Jula, Mohammad; Narimani, Mohammad; Vahabi, Sajad; Asadullah Zadeh, Hossein; Pooryazdi, Payam; Shalbaf, Hassan; Amir Gholami, Ali

doi:10.22055/jomi.2024.47002.1020

Failure analysis of austenitic stainless steel AISI 304 Exhaust bag filter at Sanati Dodefam Co.

Document Type : Research Article

Authors

Fatemeh Alijani ¹

Mohammad Jula ²

Mohammad Narimani ¹

Sajad Vahabi ¹

Hossein Asadullah Zadeh ³

Payam Pooryazdi ³

Hassan Shalbaf ³

Ali Amir Gholami ³

¹ Kavoshgaran Danesho Fan Apadana (KADFA) Co.

² Technical management, Kavoshgaran Danesho Fan Apadana (KADFA) Co.

³ Sanati Dodefam Co.

10.22055/jomi.2024.47002.1020

Abstract

In the current investigation, experts from Kavoshgaran Danesho Fan Apadana (KA DFA) examined the root causes of sever corrosion in the exhaust bag filter fabricated from AISI 304 stainless steel at Sanati Dodefam Co., located in Khuzestan Province. various structural analyses and microstructural examinations were conducted for this purpose. The results of chemical composition determination of the corrosion products using EDS and XRF indicated a significant presence of sulfur and chlorine , further confirmed by XRD analysis. The cracks observed in the equipment body were determined to have been caused by stress corrosion cracking (SCC) based on their morphology. The formation of cracks in the weld metal was attributed to the combined effects of SCC and intergranular corrosion resulting from chromium carbide precipitation due to sensitization. The comprehensive analyses revealed that the inlet gas contained water vapor along with impurities, leading to gradual extensive uniform and localized corrosion over time.

Keywords

corrosion

SCC

AISI 304

structural analysis

microstructure

failure

Subjects