Can you please clarify if metal additive manufacturing (also referred as 3D printing) is a manufacture process considered within the scope of NACE MR0175 / ISO 15156?
If the answer is negative, can you clarify if a material/alloy that is listed in NACE MR0175/ISO 15156 as acceptable for a certain environment and under certain metallurgical conditions is also considered acceptable when processed by 3D printing provided hardness limits are observed? E.g. if alloy UNS N07718 is listed as acceptable in the cast condition to a maximum hardness of 40HRC, would a N07718 component processed by 3D printing and with hardness below 40HRC is considered to meet the requirements of NACE MR0175 / ISO 15156?
Q1: Is metal additive manufacturing (also referred to a 3D metal printing) a manufacturing process defined or included in NACE MR0175/ISO 15156?
A1: 3D metal printing/metal additive manufacturing is not defined in NACE MR0175/ISO 15156.
Q2: If the answer to Q1 is no, would a currently listed alloy be acceptable for a specific application if manufactured through 3D printing and final hardness limits were within requirements of NACE MR0175/ISO 15156?
A2: In itself, this is not sufficient because 3D metal printing/metal additive manufacturing is not defined as an acceptable process route.
Q3: If the answer to Q2 is no, would UNS N07718 manufactured through 3D printing be acceptable within the restrictions of the cast condition for UNS N07718 in NACE MR0175/ISO 15156-3 Table A.31 or Table A.32?
A.3: The same answer to Q2 applies here; it is not known whether the 3D printed condition is equivalent to the cast condition defined for this alloy. To be acceptable, the production route would need to qualify in accordance with NACE MR0175/ISO 15156-3 Appendix B.
This question is in relation to NACE MR0175/ISO 15156-2 Annex A.2.1.2 and A.2.2.2
Reference: ISO 15156 Maintenance Panel Inquiry #2016-03
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