FAQ's

According to NACE MR0175, What are the hardness requirements and what hardness method should be used?

What are the hardness requirements according to NACE MR0175? Is 22HRC enough to meet NACE MR0175? What method should be used to measure hardness?

  • 22HRC is not the only NACE MR0175 requirement (see this link).
  • 22HRC applies for some carbon and low alloy steels, but 22HRC is not the hardness limit for all materials.
  • The conversion of hardness readings to and from other scales is material dependent; there are hardness conversion tables such as ASTM E140, ISO 18265 . As per NACE MR0175, the user may establish the required conversion tables.
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