NACE MR0175

NACE MR0175/ISO 15156 only addresses the resistance of materials to environmental cracking that can be caused by H2S. It does not address loss of material by general corrosion or localized corrosion such as pitting or crevice corrosion. It is also not a material specification, in that it does not address minimum mechanical properties, manufacturing processes or quality control requirements such as microstructure and non-destructive examination. Just because a material “meets NACE”, doesn’t mean it is fit for service. A perfectly bad piece of material can “meet NACE”. Material specifications such as API 5CRA/ISO 13680 address the requirements for mechanical properties and quality.