Seamless Steel Pipe Manufacturing Process

Hot rolling (extruded seamless steel pipe): Round pipe → Heating → Perforation Three-roll rolling, rolling or extrusion → Separation → Sizing (or reducing) → Cooling → Straightening → Hydrostatic test (or detection) → Mark → storage.


The raw material is rolled seamlessly through a pipe and the growth of the embryo is cut by a pipe to a blank space of about one meter or so of the cutting machine and heated by the conveyor belt to the furnace body. Billets into the furnace, the temperature is about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Furnace temperature control is the key issue. After the tube punching machine to release through the air pressure. Generally more common punch is tapered roller punching machine, this punch production efficiency, product quality, perforated diameter expansion ability, can wear all kinds of steel. After perforation, the tube was subjected to three-roll rolling, rolling or extrusion. Sizing out of the pipe. With perforated steel embryo steel processing high-speed rotary cone drill. Pipe diameter by the diameter sizing machine drill length to determine. After cooling, the cooling tube is placed in the cooling tower through a spray cooling tube and it is necessary to straighten it. The straightened strip conveyor to the metal detector (or pressure test) for internal testing. If the internal pipe cracks, bubbles and other issues, it will be detected. After the choice of steel, but also through strict quality control manual. After the quality of steel, paint the number, size, batch number and so on. Crane hooked into the warehouse.


Cold drawn (rolled) seamless steel pipe: Perforated pipe → Heating annealing pickling → → → Title (copper) → Multi-pass drawing (cold) → Tube straightening → Heat treatment → Water pressure test (test) → Mark → storage.


Cold drawn (rolled) seamless steel pipe than hot rolled seamless steel pipe rolling. The first three steps of their production process are basically the same. Difference From the fourth step, after the tube empty, the first start annealing. Use a special pickling solution after annealing. After pickling oil. After repeated drawing (cold), then blank tube, special heat treatment. After heat treatment, be sure to straighten. The straightened strip conveyor to the metal detector (or pressure test) for internal testing. If the internal pipe cracks, bubbles and other issues, it will be detected. After the choice of steel, but also through strict quality control manual. After the quality of steel, paint the number, size, batch number and so on. Crane hooked into the warehouse