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What are the NACE MR0175 requirements for ASTM A216 Grade WCB valves?

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ASTM A216 WCB valves are widely used in hydrocarbon processing. NACE MR0175 is applicable when materials like ASTM A216 WCB are exposed to H2S. The sour service requirements for ASTM A216 WCB are included in NACE MR0175.


What are the NACE MR0175 requirements for ASME IX P1 Group 1 and 2 materials? from Ivan Gutierrez on Vimeo.

Ivan Gutierrez discusses the NACE MR0175 requirements for ASME IX P1 Group 1 and 2 materials.

ASME IX P1 material is listed as acceptable in NACE MR0175, but this does not mean that the general requirements do not apply, i.e. hardness heat treatment, HIC resistance etc. At Oil & Gas Corrosion we can help you confirm material compliance to ANSI/NACE MR0175/ISO 15156.

Our team is here to discuss ASTM A216 Gr WCB, ASME IX P1/P2 and NACE MR0175 / ISO 15156 compliance. Talk to us today!


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I am writing about one question which is not clear for me after reading “NACE MR0175/ISO 15156” My question is: whether this standard is applicable for valve casting material as ASTM 216WCB or not? I have read many time this standard, but just mentioned for pipe, and fitting products . Regarding attached file I have confused should I do HIC and SSC test on the valve casting components or not? Could you please deal with the question and let me know how I can find clear idea. Reference to Valve Magazine 18 January 2011 Materials Q&A

Answer 1: If NACE MR0175/ISO 15156 is a requirement for the product then NACE MR0175/ISO 15156-2 Section 1 with Table 1 defines applicability. Valve materials are not listed in NACE MR0175/ISO 15156-2 Table 1 as a permitted exclusion. Therefore, valves must comply with the standard.

Question 2: If yes, is ASTM A216 Grade WCB compliant? ASTM A216 grade WCB is a low carbon steel with 250 MPa (36 ksi) minimum yield strength in one of the following conditions: annealed, normalized or normalized & tempered.

Answer 2: NACE MR0175/ISO 15156-2 Annex A Section A.2 lists the general compliance requirements for carbon and low alloy steels (including castings). One of the requirements of A.2.1.2 is that the hardness must be 22 HRC maximum. ASTM A216 Grade WCB could be compliant with the addition of the maximum hardness limit.

Question 3: Am I required to perform HIC and SSCs test on the valve casting components?
Answer 3: If all the requirements of NACE MR0175/ISO 15156-2 Annex A Section A.2 are met then Section A.2.1.1 states “Carbon and low-alloy steels, products and components that comply with A.2 are, with stated exceptions, qualified in accordance with this part of ISO 15156 without further SSC testing. Nevertheless, any SSC testing that forms part of a materials manufacturing specification shall be carried out successfully and the results reported.” NACE MR0175/ISO 15156-2 Clause 8 defines the need to perform HIC testing. As noted in Clause 8, castings with less than 0.025% Sulfur mass fraction are not normally considered sensitive to HIC or SOHIC
Reference: ISO 15156 Maintenance Panel Inquiry #2016-05

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