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

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
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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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