High-pressure pipe fittings are fittings with a pressure rating of ≥16 MPa. They are primarily used in high-pressure steam equipment, high-temperature and high-pressure pipelines in the chemical industry, pressure vessels in nuclear power plants, as well as in the petrochemical, offshore engineering, and marine sectors. High-pressure pipe fitting product types include elbows, tees, flanges, reducers, pipe caps, blind flanges, end caps, and pipe collars. Connection methods are categorized into three types: welding, threaded, and bolted. Common materials for high-pressure pipe fittings include carbon steel alloys (such as 20G, 20MnG, 25MnG, 15MoG), stainless steel (e.g., 1Cr18Ni9, 0Cr18Ni9), high-temperature alloy steels, and forging materials (e.g., F92, P91, 12CrMoVG)