GB/T 20972.1-2007

This standard provides general principles for selecting metallic materials resistant to sulfide stress cracking and other forms of hydrogen-induced cracking in H2S-containing environments. It is applied in the oil and gas production industry, specifically for specifying material requirements for downhole equipment, wellheads, pipelines, and processing facilities exposed to sour service conditions. The standard guides engineers and procurement professionals in choosing appropriate materials to prevent catastrophic failure during drilling, completion, and production operations.