The raw materials and technology are different. Plate pipe fittings are generally large-diameter pipe fittings, and the raw material is steel plate, which is made by pressing, welding, shaping and other processes. Low-pressure carbon steel pipe fittings are generally made directly from seamless steel pipes through various manufacturing processes. Usually, steel pipe fittings are called seamless pipe fittings, and steel pipe fittings are called seamless pipe fittings.