NACE Standard MR0175-2003, "Metals for Sulfide Stress Cracking and Stress Corrosion Cracking Resistance in Sour Oilifield Environments," has merged with ISO 15156, "Petroleum and natural gas industries-Materials for use in H_2S-containing environments in oil and gas production." The new standard becomes NACE MR0175/ISO 15156, following passage of the final International Organization for Standardization (ISO) ballots for ISO 15156 Parts 2 and 3. NACE Standard MR0175 was originally published in 1975, superseding NACE Publication 1F166, "Sulfide Cracking-Resistant Metallic Materials for Valves for Production and Pipeline Service," and NACE Publication 1B163, "Recommendation of Materials for Sour Service" (which included Tentative Specifications 150 on valves, 51 on severe weight loss, 60 on tubular goods, and 50 on nominal weight loss).
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