Are carbon-manganese steels included in NACE MR0175?

What Is Carbon Manganese Steel in NACE MR0175?

Understanding ISO 15156-2 Annex A.2.1.4

In ISO 15156-2 Annex A.2.1.4, there is a differentiation between “”carbon steel””, “”carbon manganese steel””, and “”low-alloy steel””. While the terms “”carbon steel”” and “”low-alloy steel”” are defined in ISO 15156-1, “”carbon manganese steel”” is not.

Definition of Carbon Manganese Steel

So, what is the definition of “”carbon manganese steel”” within the scope of NACE MR0175? (MP INQUIRY #2017-23)

While not explicitly defined in ISO 15156-1, the definition of carbon manganese steel is inferred in the definition of carbon steel, which states that these alloys may include up to 1.65 mass percent Mn.

Potential Changes to Definition

The need to provide a separate definition for carbon manganese steel or enhance the existing definition in ISO 15156-1 will be discussed by the MP. However, a technical ballot would need to be submitted to make any suggested changes.

NACE MR0175 and Metallic Materials

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

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