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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
