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Sigma Phase Embrittlement of Type 304H Stainless Steel after FCCU Service

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Results are described of sigma phase embrittlement assessments performed at three different refineries and mainly involving regenerator cyclones at fluidized catalytic cracking units (FCCU) but also including regenerator cyclones hanger rods and a regenerator flue gas line.

Product Number: 51317--9140-SG
ISBN: 9140 2017 CP
Author: Jorge Hau
Publication Date: 2017
Industries: Materials Selection and Design , Science of Corrosion
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$20.00
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In line with previous publication NACE paper 06578 results are described of more recent sigma phase embrittlement assessments performed at three different refineries and mainly involving regenerator cyclones at fluid catalytic cracking units but also included one case of regenerator cyclones hanger rods and another case with regenerator flue gas line. The materials of constructions is type 304H (UNS S30409) and 304 Modified which is similar to 304H with addition restriction on chemical composition. In addition to sigma phase volume fraction measurements and Charpy V-Notch testing done at ambient and warm temperatures that produced results that are consistent with the previous publication creep testing was performed to both base metal and weld metal with surprising results. The MPC Omega method was used. Despite significant sigma phase embrittlement revealed by impact testing the base metal exhibited excellent creep ductility at operating temperature unlike the weld metal that behaved brittle in both tests Charpy and Omega tests.

Key Words: Asset, equipment, preservation, volatile corrosion inhibitors, mothballing, storage

In line with previous publication NACE paper 06578 results are described of more recent sigma phase embrittlement assessments performed at three different refineries and mainly involving regenerator cyclones at fluid catalytic cracking units but also included one case of regenerator cyclones hanger rods and another case with regenerator flue gas line. The materials of constructions is type 304H (UNS S30409) and 304 Modified which is similar to 304H with addition restriction on chemical composition. In addition to sigma phase volume fraction measurements and Charpy V-Notch testing done at ambient and warm temperatures that produced results that are consistent with the previous publication creep testing was performed to both base metal and weld metal with surprising results. The MPC Omega method was used. Despite significant sigma phase embrittlement revealed by impact testing the base metal exhibited excellent creep ductility at operating temperature unlike the weld metal that behaved brittle in both tests Charpy and Omega tests.

Key Words: Asset, equipment, preservation, volatile corrosion inhibitors, mothballing, storage

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Picture for 06578 Sigma Phase Embrittlement of Stainless Steel
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06578 Sigma Phase Embrittlement of Stainless Steel in FCC Service

Product Number: 51300-06578-SG
ISBN: 06578 2006 CP
Author: Jorge Hau, Antonio Seijas
Publication Date: 2006
$20.00

Assessment of sigma phase embrittlement in austenitic stainless steels such as Type 304H, commonly used in fluid catalytic cracking (FCC) units. Other austenitic stainless steels used in other refining process units are also discussed. The detection and measuring of the amount of sigma phase were made using metallography. 
Picture for Effect of Sigma Phase on the Environmental Assisted Cracking of Super Duplex Stainless Steel in Oil
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51312-01272-Effect of Sigma Phase on the Environmental Assisted Cracking of Super Duplex Stainless Steel in Oil

Product Number: 51312-01272-SG
ISBN: 01272 2012 CP
Author: Janardhan Rao Saithala
Publication Date: 2012
$20.00
Picture for Accelerated Corrosion of 304H SS in RFCC Regenerators Involving Low Temperature Eutectic-Forming Sal
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Accelerated Corrosion of 304H SS in RFCC Regenerators Involving Low Temperature Eutectic-Forming Salts

Product Number: 51317--8915-SG
ISBN: 8915 2017 CP
Author: Jayant Nair
Publication Date: 2017
$20.00

This article presents findings on type II high temperature (650-800ºC) corrosion in Residue Fluid Catalytic cracking (RFCC) regenerator service (alloy SS304H) and examines the possible strategies for alloy upgrade in RFCC service.
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