Seamless elbows do not cause corrosion, pitting, rust or wear. Stainless steel is also one of the most intensive building metal materials. Because stainless steel has good corrosion resistance, it can make structural parts permanent to maintain the integrity of Engineering design. The raw material for rolling seamless elbow pipe fittings is round billet. The tube embryo is cut and processed by a cutting machine to grow up to about one meter, and is heated by conveyor belt in the furnace. The billet is heated in the furnace and the temperature is about 1200 degrees Celsius. Temperature control in the furnace is a key issue. After the tube billet is discharged from the furnace, it is perforated by a pressure punch. The fuel is hydrogen or acetylene.
The common piercing machine is conical roll piercing machine. This piercing machine has high production efficiency, good product quality, large piercing diameter enlargement, and can pierce many kinds of pipe fittings. After piercing, the round tube billet is rolled by three rolls, continuous rolling or extrusion. After extrusion, the tube must be stripped and calibrated. The calibrating machine rotates into the steel embryo at high speed through the conical drill to form pipe fittings.
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