Seamless elbow is a type of pipe fitting used at pipe bends. Among all the fittings commonly used in pipeline systems, the proportion is large, accounting for about 80%. Usually, different forming processes are chosen for elbows with different materials and wall thicknesses. The commonly used seamless elbow forming processes in manufacturing plants include hot pressing, stamping, extrusion, etc

Seamless elbow, also known as seamless steel pipe elbow or seamless pipe elbow in English, is divided into two types: hot-rolled (extruded) seamless elbow fittings and cold drawn (rolled) seamless elbow fittings due to their different manufacturing processes. Cold drawn (rolled) pipes are divided into two types: circular pipes and irregular pipes

The raw material for rolling seamless elbow fittings is round tube blanks. The round tube blanks need to be cut and processed by a cutting machine with a length of about one meter, and then sent to the furnace for heating by a conveyor belt. The steel billet is sent into the furnace for heating at a temperature of approximately 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control inside the furnace is a crucial issue. After the round tube billet is discharged from the furnace, it needs to be pierced through by a pressure piercing machine. The most common piercing machine is the conical roller piercing machine, which has good production efficiency, good product quality, large perforation and expansion capacity, and can pass through various pipe fittings. After perforation, the round tube blank is sequentially subjected to three rolls of oblique rolling, continuous rolling, or extrusion. After squeezing, the pipe needs to be detached and fixed in diameter. The sizing machine rotates the conical drill bit at high speed into the steel billet to drill holes, forming pipe fittings