The GB/T 20972.3 - 2008 standard focuses on cracking and corrosion-resistant alloys and Miscellaneous alloy materials in the hydrogen sulfide environment of oil and gas extraction in the oil and gas industry. It specifies the performance requirements, inspection and test methods of such materials, covering material composition, mechanical properties, resistance to hydrogen sulfide cracking and other key indicators. The standard provides a basis for the screening of suitable materials in the oil and gas industry to help enterprises ensure the safe operation of equipment in high corrosion environments, effectively reduce the risk of production accidents caused by material problems, and promote the safe production and standardized application of materials in the industry.