In NACE MR0175, What is a carbon-manganese steel?

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?
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.
This question is in relation to NACE MR0175/ISO 15156-2/A.2.1.4
Reference MP inquiry #2017-23

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