What is a NACE material? What is NACE piping? What is a NACE MR0175 compliant steel? Where is the definite list of NACE MR0175 compliant materials?

NACE is the National Association of Corrosion Engineers, NACE publishes many documents related to corrosion control including NACE MR0175 which provides the requirements for metallic materials exposed to H₂S in oil and gas production environments.

NACE MR0175 lists the requirements for carbon steels, low alloys and corrosion resistant alloys.  For each material group, NACE MR0175 provides the following metallurgical requirements:

• Chemistry
• Hardness
• Heat treatment
• HIC resistance etc

NACE MR0175 also provides the environment limits i.e, amount of H₂S expressed as partial pressure, the maximum chloride content, pH range etc.

A NACE MR0175 compliant material (sometimes inaccurately referred to as NACE material or NACE piping) is a material that meets all the requirements of NACE MR0175 and can be used in H₂S environments within the limits set by the standard.

It is extremely important to say: Hardness below 22HRC is required for some materials but it is not the only NACE MR0175 requirement.

Our team can help you answer the following questions:

• What are the NACE MR0175 requirements for a specific material?
• The MTR does not state “NACE compliant”, is the material ok?
• What’s the minimum ppm of H₂S for “NACE material”?
• How to specify “NACE material”? Is HIC required?
• Is there a list of NACE MR0175 approved materials?
• Where are the NACE material checklists?