51312-01515-UNS S32654 SUPERAUSTENITIC STAINLESS STEEL FOR DEMANDING OFFSHORE APPLICATIONS

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Product Number: 51312-01515-SG

ISBN: 01515 2012 CP

Author: Elisabeth Johansson

Publication Date: 2012

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As process conditions in the oil and gas industry becomes more demanding the number potential applications areas requiring the use of high-performance superaustenitic stainless steels has increased. This has lead to the reintroduction of the UNS S32654 grade (24Cr 22Ni 7.3Mo 3Mn) which has a unique combination of high strength and outstanding resistance to corrosion making it suitable for use in process streams and well as in seawater handling systems. This paper presents results for UNS S32654 with regards to localized corrosion in chloride environments. This includes pitting crevice corrosion and stress corrosion cracking in standardized laboratory tests and also testing in natural seawater environments. Results are compared with other superaustenitic stainless steel grades such as UNS S31245 and UNS S34565 and to nickel base alloys such as UNS N10276 and UNS S06025. The results show that UNS S32654 has higher resistance to the different forms of localized corrosion than the other superaustenitic grades. It is also shown that regarding resistance to crevice corrosion UNS S32654 can be on a par or better than some nickel base alloys. UNS S32654 is qualified for use in H2S-containing environments in oil and gas production within NACE MR 0175/ISO 15156 and details of a number of qualification tests are described. Testing was carried out in accordance with NACE MR0177 and also in autoclave environments up to 1.4 bar pH2S and no cracking was observed for UNS S32654.