What happens when HIC, SOHIC or SZC fails in testing as per NACE MR0175 Part 2 Clause B.4?
NACE MR0175/ISO 15156-2/B4: Questions and Answers on Test Procedures for Carbon and Low-Alloy Steels
Understanding the Scope of Section B4
This article provides a question-and-answer format for inquiries related to the application of NACE MR0175/ISO 15156-2/B4, which covers test procedures to evaluate the resistance of carbon and low-alloy steels to SOHIC and SZC. The first question seeks to clarify the scope of section B4.
Clarifying Evaluation Requirements for SOHIC/SZC Resistance
The answer confirms that section B4 applies to the evaluation of resistance to SOHIC and SZC only but also requires that materials be qualified with respect to SSC resistance for the design conditions before SOHIC/SZC evaluation.
Interpreting Clause B.4.2.3
The second question is about the interpretation of Clause B.4.2.3, which sets evaluation and acceptance criteria for FPB test specimens. The interpretation question addresses whether ladder-like HIC features and cracks exceeding a length of 0.5 mm in the through-thickness direction are allowed or not, and whether the word “”nor cracks”” refers to cracks associated with SOHIC and SZC only.
Clarifying Evaluation Criteria for FPB Test Specimens
The answer clarifies that “”No ladder-like HIC features nor cracks exceeding a length of 0,5 mm in the through thickness direction are allowed”” and does not infer what the interpretation by the questioner intended.
Assistance with HIC/SOHIC Test Results
The article also offers the services of the team at OGC Energy to assist clients in evaluating HIC/SOHIC test results and ensuring material suitability for sour service use.