GB/T 20972.3-2008

This standard specifies technical requirements for selecting and qualifying corrosion-resistant alloys (CRAs) and other alloys that resist sulfide stress cracking in hydrogen sulfide (H₂S)-containing environments. It is applied in the petroleum and natural gas industries, specifically for materials used in downhole equipment, wellhead components, and surface facilities during oil and gas production where sour service conditions are present. The standard ensures material integrity and safety by defining testing methods and acceptance criteria for cracking resistance in H₂S environments.