FAQ's

According to NACE MR0103, What is a “nace material” and who is responsible to make sure it really is a “nace material”?

According to NACE MR0103 / ISO 17945, What is a “nace material” and who is responsible to make sure it really is a “nace material”?

Q1: Who should be the entity that guarantees the conformance of NACE MR0103 / ISO 17945? Raw material supplier (e.g. mill or stockist) or fabricator?

Q2: What do you think of the idiom “NACE material”? Is it an official expression?

Many of fabricators are applying “NACE material” to fabricate pressure vessels or pipings when wet H2S Service is specified. And “they” say that the conformity of NACE MR0103 should be guaranteed by mill and specified on mill certification. One mill says that they put “NACE MR0103” in mill certification when purchaser requests but there is no difference with other normal CS order since the base metal hardness and chemistry specified in the standards are within the range of their ordinary CS products. However, I am wondering this kind of authentication since as far as I know, NACE MR0103 / ISO 17945 requires not only base metal hardness and chemistry but the weldment control as a primary factor to prevent SSC

A1: Responsibility is defined in section 5 of MR0103/ISO 17945. Per 5.2, the manufacturer is responsible for meeting the metallurgical requirements of the standard. Beyond that, MR0103/ISO 17945 provides no guidance.

A2: MR0103/ISO 17945 provides no guidance on how compliance shall be documented. It is up to the manufacturer and end user to determine what documentation is adequate to establish compliance with the requirements of the standard

Reference: NACE MR0103 Inquiry

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