When choosing the valve casting material for a valve, the first thing to consider is the working condition of the valve, mainly the medium, temperature, and pipeline pressure of the valve. There are many materials for the valve, and there is no better one, only the appropriate one. You can refer to the material of the pipeline for some special media, Special requirements also need to be placed on valves (valves for hydrogen media must be degreased, valves for sulfur-containing media must comply with NACE requirements, valves for ammonia must not contain copper materials, and some low-temperature valves must be subjected to cryogenic treatment, etc.)