Seamless pipe fittings are connecting components used in piping systems to alter the flow direction. They are made from materials such as carbon steel, stainless steel, and alloy steel, and are produced using forming techniques including hot pushing, stamping, and extrusion, with the specific process selected based on material properties or wall thickness. Products are classified by forming method into hot-rolled (extruded) and cold-drawn (rolled) types; cold-drawn types can be further subdivided into round and shaped tubes. By angle, they are categorized into 45°, 90°, and 180° types, and by radius of curvature, into long-radius (R=1.5D) and short-radius elbows. The manufacturing process involves cutting round tube blanks, piercing after heating to 1200°C, followed by sizing after forming via oblique rolling, continuous rolling, or extrusion. Tapered roll piercing machines are commonly used to improve efficiency. Applicable standards include GB/T 12459-2017, ASME/ANSI, and other domestic and international specifications, making these products suitable for applications in the petrochemical, power generation, and shipbuilding industries.