Application of UNS S31254 (6Mo super austenitic stainless steel, hereafter: 6Mo SS) has increased in oil and gas facilities to mitigate the corrosion associated with chlorides.

In recent years, two cracking cases have occurred in hot-formed flanges and cold-formed fittings made of 6Mo SS, and it was considered that all the cracking occurred during the forming processes. Though some information on the workability of 6Mo SS is currently available, further technical data is needed to understand the workability and mitigate the risk of cracking.

This paper firstly presents cases of cracking during the forming processes for hot-formed flanges and cold-formed fittings. Then, the results of investigations into the hot and cold workability of UNS S31603 (hereafter: 316L SS) and 6Mo SS are presented. Also some recommendations to reduce the risk of cracking during forming processes are offered.

Subject
Sigma phase, Strain rate, Materials, Solidification, Tensile tests, Flanges, Stress cracking, Workability, Stainless steel, Cracking, Ferrite, Stress corrosion cracking, Test specimen
Keywords:
6Mo stainless steel, cold workability, hot workability, torsion test, tensile test, n value
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2016
Association for Materials Protection and Performance (AMPP)
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