In NACE MR0175, is UNS S20910 acceptable in hot worked conditions?

6th April 2016

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Question: In NACE MR0175, is UNS S20910 acceptable in hot worked conditions?

Answer:

The Table A.3 permits cold working to 35 HRC as long as the material has a solution annealing cycle that precedes it. The UNS S20910 is acceptable per the applications of Table A.3 in the hot worked condition that is subsequently solution annealed and cold worked to 35 HRC. The UNS S20910 is acceptable per the applications of Table A.3 in the hot worked condition as long as it is free of cold work intended to enhance mechanical properties and has a maximum hardness of 35 HRC. The condition of UNS S20910 in the hot worked condition followed only by cold working that enhances mechanical properties is not addressed in Table A.3; changing Table A.3 to permit this condition would require a successful ballot.

This question is in relation to NACE MR0175/ISO 15156-3 Table A.3

Reference: ISO 15156 Maintenance Panel Inquiry #2014-09R

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Oil and Gas Corrosion Ltd is an independent materials and corrosion consultancy for the Oil and Gas industry. Oil and Gas Corrosion Ltd is under the guidance of Ivan Gutierrez. Ivan has more than 20 years’ experience in materials and corrosion and is a member of the National Association of Corrosion Engineers (NACE), a professional member of the Institute of Corrosion (MICorr) and the Society of Petroleum Engineers (SPE). He is a recognised materials and corrosion authority recognised as a Great Britain national expert member of the British Standard Institution committee PSE/17/67/7 “Corrosion Resistant Materials” and internationally as a member of Task Group 299 on the Oversight of Maintenance Panel for NACE MR0175 / ISO 15156. “Materials for use in H2S-containing environments in oil and gas production”, IOGP 15156 Committe (ISO/TC 67/WG 7 “Corrosion Resistant Materials”. Ivan is also a member of ISO/TC 67/WG 8 Materials, corrosion control, welding and jointing, and non-destructive examination (NDE) which is responsible for standards such as ISO 21457 “Materials selection and corrosion control for oil and gas production systems”. Oil & Gas Corrosion has headquarters in the United Kingdom providing services to clients across the globe.

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