Question: Does requiring/specifying steel compliance to ANSI/NACE MR0175/ISO 15156-2 in a purchase order include resistance to HIC as well as other forms of sulfide cracking, or must HIC resistance be specifically required separately in the purchase order?
ISO 15156 / NACE MR0175 covers all cracking mechanisms caused by H2S to be addressed for materials exposed in production environments. This includes HIC/SWC as stated in the scope for Part 2. Section 8 in ISO 15156 / NACE MR0175 Part 2 describes how carbon and low alloy steels shall be evaluated for their resistance to HIC/SWC. Test procedures and acceptance criteria to evaluate the resistance of carbon and low-alloy steels to HIC/SWC are described in B.5. As only flat-rolled carbon steel products are susceptible to HIC/SWC, section 5.2 requires that “requirements for HIC resistance” are provided in the purchasing specification. Note that a list of information must be included in the purchase order (note also the use of the word “shall” in the section) that includes “requirements for HIC resistance”.
This question is in relation to NACE MR0175/ISO 15156-2 Clause 5.2
Reference: ISO 15156 Maintenance Panel Inquiry #2014-02
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