What are the NACE MR0175 hardness requirements for LF2?
Question: Kindly clarify does NACE MR-0175/ISO 15156 specifies the Hardness requirement for ASTM A350 Grade LF2 material.
NACE MR0175/ISO 15156 does not dictate the hardness requirements that may be present in other standards. The standard does define material requirements and use limits as they relate to environmental cracking in the presence of H2S. ASTM A350 LF2 requires the hardness to be 197 HB maximum and this meets the requirements for carbon steel forgings in NACE MR0175/ISO 15156-2. Please refer to Clause A.2.1 and the sub-clauses beneath it for carbon and low alloy steels.
Reference MP Inquiry 2017-01 (NACE MR0175 Part 2 Scope)