Production process of seamless steel pipe
According to the production method, seamless steel tubes are divided into hot-rolled tubes, cold rolled tubes, cold drawn pipes, extruded pipes, pipe jacking and so on. According to the shape of the section, the seamless steel pipe is divided into two kinds of circular and heteromorphic forms. The special-shaped tubes have square, oval, triangular, hexagonal, melon, star, and winged tubes.
According to different uses, there are thick wall tube and thin wall tube. The seamless steel pipe is mainly used for oil geological drilling pipe, petrochemical pipe, boiler tube, bearing tube, and high precision steel pipe for automobile, tractor and aeronautical use.
So, how does the seamless steel pipe come out? How is the seamless steel tube production process flow? Seamless steel pipe is made of steel ingot or solid tube billet by perforation, and then made by hot rolling, cold rolling or cold dialing. Seamless steel tube plays an important role in China's steel pipe industry.
The raw material for rolling seamless steel pipe is round tube, and the round tube embryo must be cut by cutting machine to grow about 1 meters, and then be sent to the furnace by the conveyor belt. The billet is heated into a furnace and the temperature is about 1200 degrees Celsius. Fuel is hydrogen or acetylene. The temperature control in the furnace is a key problem. After the tube is put out, it needs to pass through the pressure piercer. The most common perforator is a cone roller piercer, which has high production efficiency, good product quality, large perforation and large diameter, and can wear many kinds of steel.
After piercing, the round billet is successively rolled, rolled or extruded by three rolls. After extrusion, the diameter of the tube should be taken off. The sizing machine punched through the tapered bit into the steel embryo to form a steel pipe. The inner diameter of the steel pipe is determined by the length of the diameter of the drill bit. After the steel pipe is fixed, it enters the cooling tower and is cooled by water spray. After cooling, the steel tube will be straightened. After being straightened, the steel pipe is sent to the metal flaw detector (or water pressure test) through the conveyor belt for internal detection. If there are cracks inside the steel pipe, bubbles and other problems will be detected. After the quality inspection, the steel pipe should be selected by strict manual selection. After the quality inspection of the steel pipe, paint numbers, specifications, production batch numbers and so on. And the crane is hoisted into the warehouse.
In short, the seamless steel pipe production process includes these processes: tube blank - cutting - heating - perforation - tube - fixed (reducing) diameter - straightening - cutting head and tail - Inspection - Packaging - into the warehouse.