Hot-rolled (extruded seamless pipe) production process round tube → heating → perforation → three-roll rolling, rolling or extrusion → → set off pipe diameter (or reducing) → cooling → straightening → hydrostatic test ( or testing) → mark → storage seamless steel ingot is made of perforated or solid through the capillary tube, and then by the hot-rolled, cold-rolled or cold call is made. Seamless steel pipe wall thickness specifications mm diameter * number indicates. Hot and cold rolled seamless steel pipe points (written) seamless steel categories. Hot-rolled seamless steel pipe sub-normal, low, medium pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, steel and other steel and other geological. Hot-rolled seamless pipe diameter is generally greater than 32mm, wall thickness 2.5-200mm, cold-rolled seamless steel pipe at the path can go to 6mm, wall thickness can be 0.25mm, outer diameter thin-walled tube to 5mm thickness less than 0.25mm 45 # precision steel plant, cold than hot-rolled high dimensional accuracy. Seamless is 10,20,30,35,45 and other high quality carbon steel 16Mn, 5MnV low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2,40MnB such as structural steel hot-rolled or cold-rolled steel. 10,20 and other low-carbon steel seamless pipe is mainly used for fluid pipes. Seamless 45,40Cr etc. made of carbon steel used to manufacture mechanical parts, such as cars, tractors and the force components. General seamless steel pipes to ensure the strength and flattening test. Hot-rolled steel hot-rolled state or heat treatment delivery; Hot, by definition, high temperature rolling precision steel plant, and therefore small deformation resistance, can achieve a large deformation. The steel rolling, for example, generally slab thickness of about 230mm, and after roughing and finishing 20 # precision steel plant, the final thickness of 1 ~ 20mm. Meanwhile, due to the generous plate is smaller than 10 # precision steel plant, dimensional accuracy requirements are relatively low, not prone to flatness problem, mainly to control the crown. Requirements for the organization, usually by controlled rolling and cooling to achieve that control the opening and finishing rolling temperature, finish rolling temperature precision seamless Process Description: high quality carbon steel, refined pull, no oxidation bright heat treatment (NBK state), nondestructive testing, pipe wall and through the high-pressure wash equipment wash, anti-rust oil for rust on steel processing, both ends of the dust cover for treatment. Main features: high accuracy, good finish, after heat pipe outer wall oxide layer, the inner wall of cleanliness, steel to withstand high pressure, cold deformation, flaring, flattening without cracks, can make a variety of complex deformation and mechanical processing . Steel Color: light gray with white main purposes: hydraulic systems with steel, automotive steel, the other of steel precision, finish, cleanliness, there are areas of high mechanical performance requirements. Precision steel factory | precision steel production plant (certified) | Precision Steel Plant in Shandong Liaocheng by Polygram Steel Pipe Manufacturing Co., Ltd. Shandong Liaocheng Polygram Pipe Manufacturing Co. (www.lcbljgg.com) (www.lcbljgg.com) (www.sdlcblj.com) (www.bljggzz.com) Shandong Liaocheng, wire, pipe, plate manufacturing equipment leaders, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Polygram steel leader with the staff warmly welcome all inquiries negotiations to create Polygram steel a better future. You can also access (www.lcbljgg.com/supply_details_45456020.html), for more information about the company.