Thick wall seamless steel tube production process

Thick-walled steel pipe mainly used in petroleum geology drilling pipe, petrochemical cracking with tubes, boiler tubes, pipes and automotive bearings, tractors, aviation structures with high precision tubes.

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) sign → storage.

The raw material of rolling seamless tube is round. And by conveyor belt to the furnace heating. The billet is fed into the heating furnace, the temperature is about 1200 ℃. Fuel is hydrogen or acetylene. Furnace temperature control is a critical issue. After the round tube furnace to go through the pressure puncher piercing. 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.

Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.