Seamless Steel Pipe Manufacturing Process

Keywords:Seamless Steel Pipe Manufacturing Process
Hot-rolled (extrusion seamless steel pipe): round tube perforation → heating → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage.

The raw material is rolled seamless round tube, pipe cutting through the growth of the embryo to the degree of cutting machine is about one meter of the blank, and by conveyor belt to the furnace heating. The billet is fed into the heating furnace, the temperature is about 1200 degrees Celsius. Fuel is hydrogen or acetylene. Furnace temperature control is the key issue. Released after round tube piercing machine to go through the pressure of wearing empty. Generally more common punch is tapered roller punching machine, punching machine such high production efficiency, product quality, perforated expanding capacity, can be worn a variety of steel. After perforation, round tube has been three-roll rolling, rolling or extrusion. To squeeze off the pipe after sizing. Sizing mill into high-speed rotating cone drill through perforated steel embryo formed steel. Pipe inside diameter is determined by the outside diameter sizing mill drill length. After sizing the pipe into the cooling tower through spray cooling pipe after cooling, it is necessary to be straightened. After straightening the steel conveyor belt to the metal detection machine (or pressure test) for internal testing. If the internal pipe cracks, bubbles and other issues, will be detected. After the selection of steel but also through strict quality control manual. After the steel quality, spray paint on number, size, batch number and so on. By a crane into the warehouse. 

Cold drawn (rolled) seamless steel pipe: round tube perforation → heating → annealing → pickling → Heading oiled (copper) → multi-pass drawing (cold) → blank tube straightening → heat treatment → hydrostatic testing (testing) → mark → storage. 

Cold drawn (rolled) seamless steel pipe rolling method than hot-rolled (extruded seamless pipe) complex. Their first three steps of the production process is basically the same. The difference from the beginning of the fourth step, after playing a round tube empty, to begin with, annealing. After annealing to use a special acid pickling liquid. After pickling, oiled. Then followed through many times drawing (cold) and then blank tube, special heat treatment. After heat treatment, must be straightened. After straightening the steel conveyor belt to the metal detection machine (or pressure test) for internal testing. If the internal pipe cracks, bubbles and other issues, will be detected. After the selection of steel but also through strict quality control manual. After the steel quality, spray paint on number, size, batch number and so on. By a crane into the warehouse.