Large diameter thick-walled seamless steel pipe, small diameter thick-walled seamless steel large diameter thick-walled seamless steel ingot made of perforated or solid through the capillary tube, and then made by hot rolling. Large diameter thick-walled seamless steel pipe has an important position in China's steel industry. Steel pipe blank material is, after cutting the tube to a length of about 1 meter cutter blank, and by the conveyor belt to the heat within the furnace. http://www.lcsyfgg.cn/ billet is fed into the furnace heated to a temperature of about 1200 ℃. Fuel for hydrogen or acetylene. After the furnace temperature control is critical issues · baked to go through the pressure tube round punch machine wear empty. Generally more common puncher is piercing mill, this puncher high production efficiency, product quality, perforation expanding capacity, can wear a variety of steel. After perforation, round tube would have been three-roll rolling, rolling or extrusion. To squeeze off the pipe after sizing. Sizing machine into high-speed rotating cone drill through steel embryo drilling, formation of pipe. Pipe inside diameter is determined by the outer diameter sizing mill drill length. After sizing the pipe into the cooling tower through the water cooling pipe cooling, must be straightened (In fact, many of the manufacturers have no longer leveler straightening up, but in the steel mills directly through reached its straightness of the pipe itself). After straightening the steel belt to the metal detection machine (or pressure testing) for internal testing. If the internal pipe cracks, bubbles and other issues, will be detected. After the pipe but also through a rigorous quality inspection manual selection (now have laser detection test). According to 16mn seamless surface hardness, the original extent of corrosion, surface roughness, coating and other requirements to select the type of abrasive, single layer of epoxy, two or three layers of polyethylene coating, using grit and steel shot mixed abrasive blasting easier to achieve the desired effect.