Are carbon-manganese steels included in NACE MR0175?


ISO 15156-2 Annex A.2.1.4 differentiate between “carbon steel”, “carbon manganese steel” and “low-alloy steel”.
The terms “carbon steel” and “low-alloy steel” are defined in ISO 15156-1, but not “carbon manganese steel”.
What is the definition of “carbon manganese steel” in the scope of NACE MR0175? (MP INQUIRY #2017-23)


Although not directly defined in ISO 15156-1, the definition of carbon manganese steel is inferred in the definition of carbon steel. As described, these alloys may contain up to 1.65 mass percent Mn. The MP will discuss the need to provide a separate definition or enhance the definition in ISO 15156-1. However, a technical ballot would need to be submitted to make any suggested changes.

NACE MR0175 is an international standard that provides the requirements for metallic materials exposed to H2S in oil and gas production environments.
NACE MR0175 is identical to ISO 15156. ANSI / NACE MR0175 / ISO 15156 lists the requirements for carbon steels, low alloys and corrosion resistant alloy exposed to H2S in oil and gas exploration and production environments.

this question is in relation to NACE MR0175 / ISO 15156 Part 2 Clause A.2.1.4

Reference MP #2017-23

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