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Polythionc Acid Stress Corrosion Cracking On Proprietary UNS S34751 Similar Welded Joint

Picture for Polythionc Acid Stress Corrosion Cracking On Proprietary UNS S34751 Similar Welded Joint
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Product Number: 51321-16778-SG
Author: Takahiro Osuki; Kazuhiro Ogwa; Yuhei Suzuki; Shinnosuke Kurihara; Akiraz Seki; Masaki Ueyama
Publication Date: 2021
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$20.00
$20.00

It was reported in NACE (¹l C2019-12783 that S34751 with extra low carbon content less than 0.015  wt% achieved superior Polythionic Acid Stress Corrosion Cracking (PTA SCC) resistance without Post  Weld Heat Treatment (PWHT) in hydro-treating or hydro-cracking processes in a complex refinery. However, PTA SCC resistance of Heat Affected Zone (HAZ) and weld metal for actual welded joint of  S34751 was not included in NACE C2019-12783 because of the usage of S34751 test sample with  simulated HAZ heat treatment using high frequency induced heating equipment. In this research, the sensitization property and PTA sec resistance of S34751 similar welded joint with the slight variation of carbon content using matching welding filler were evaluated to confirm the validity of the test results using simulate HAZ heat treated sample.

It was reported in NACE (¹l C2019-12783 that S34751 with extra low carbon content less than 0.015  wt% achieved superior Polythionic Acid Stress Corrosion Cracking (PTA SCC) resistance without Post  Weld Heat Treatment (PWHT) in hydro-treating or hydro-cracking processes in a complex refinery. However, PTA SCC resistance of Heat Affected Zone (HAZ) and weld metal for actual welded joint of  S34751 was not included in NACE C2019-12783 because of the usage of S34751 test sample with  simulated HAZ heat treatment using high frequency induced heating equipment. In this research, the sensitization property and PTA sec resistance of S34751 similar welded joint with the slight variation of carbon content using matching welding filler were evaluated to confirm the validity of the test results using simulate HAZ heat treated sample.

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

Product Number: 51319-12783-SG
Author: Takahiro Osuki
Publication Date: 2019
$20.00

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
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