Thick-walled 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) 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.