To give its full name, NACE MR 0175 (‘Metals for Sulphide Stress Cracking and Stress Corrosion Cracking Resistance in Sour Oilfield Environments’), specifies the types of corrosion resistant materials that can be used in specific oilfield environments. One particular feature of this standard is the use of limits for material hardness, as it is the only practical material measurement that can be conducted in the field as a validation of material specification.

The NACE MR0175 Specification need to prevent SSC in downhole environments, piping systems, storage batteries, desulphurization systems and so on which take the material upto the fence of the refinery.

Nace Mr0175 Chemical composition

NACE was established since 1943, full form is National Association of Corrosion Engineers. MR0175 is the standard of material requirements for H2S containing gas and oil production and equipment. NACE MR0175/ISO 15156 provides similar rules, gives requirements and suggestions to select qualified steel materials, that served in equipment utilized in gas and oil production and in natural gas sweetening plants in H2S-containing environments.

NACE MR0175/ISO 15156 are resistant to crackings, such as:

• Hydrogen-induced craking
• Sulfide stress cracking (SSC)
• Galvanically induced hydrogen stress cracking.
• Stepwise cracking
• Soft zone cracking
• Stress-oriented hydrogen-induced cracking
• Stress corrosion cracking