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Effect of Carbon Content on Polythionic Acid Stress Corrosion Cracking Resistance for UNS S34751 with Extra Low Carbon Content

Polythionic Acid Stress Corrosion Cracking (PASCC) of conventional austenitic stainless steel is serious problem at desulfurization units in petroleum refinery.Post Weld Heat Treatment after welding and/or neutralization treatment using alkaline solution are required during each turn around to prevent PASCC according to NACE SP0170-2012.It has been known that proprietary version Type 347LN has superior PASCC resistance even if without Post Weld Heat Treatment (PWHT) compared with Type 347(H) or Type 321(H). Although the proprietary version Type 347LN is lower C content compare with standardized C content range (0.02%) to suppress precipitation of M23C6 carbide it is not reported that the effect of the slight variation of C content to PASCC resistance.Therefore the relationship between C content and PASCC resistance was investigated by using long term aged samples with simulated welding Heat Affected Zone. As the result it was clarified that the strict control of C content less than 0.015% was effective to keep superior PASCC resistance under extra low C content range less than 0.02%.Key words:  Polythionic acid stress corrosion cracking Sensitization Proprietary version Type 347LN Hydroprocessing C content matching filler weld metalBest regardsTakahiro Osuki from NSSMC

Product Number: 51319-12783-SG
Author: Takahiro Osuki
Publication Date: 2019
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Polythionic Acid Stress Corrosion Cracking Of UNS S34751 Containing Higher Cu For Improvement Of Creep Strength

Product Number: 51321-16636-SG
Author: Yuhei Suzuki / Takahiro Osuki/ Masaki Ueyama/ Etsuo Dan/ Nao Otaki/ Hirokazu Okada
Publication Date: 2021
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