The outer diameter of hot-rolled seamless pipe is generally greater than 32mm and the wall thickness is 2. Choosing precision seamless steel pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining man-hours, improve material utilization, and at the same time help improve product quality. Compared with round pipes, special-shaped pipes generally have larger moments of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce structural weight and save steel.ASTM A53 ERW steel pipe is a typical carbon steel pipe. The specifications of seamless steel pipes are expressed in millimeters of outer diameter wall thickness.[13] Precision inner diameter seamless steel pipes for hydraulic and pneumatic cylinders (GB8713-88) are cold-drawn or cold-rolled precision seamless steel pipes with precise inner diameters for the manufacture of hydraulic and pneumatic cylinders. The outer diameter of thin-walled pipe can be up to 5mm and the wall thickness is less than 0.[12] High-pressure oil pipes for diesel engines (GB3093-2002) are cold-drawn seamless steel pipes used to manufacture high-pressure pipes for diesel engine injection systems.[16] Stainless steel seamless steel pipes for fluid transportation (GB/T14976-2002) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipes made of stainless steel used to transport fluids.25mm. The outer diameter of cold-rolled seamless pipe can be up to 6mm and the wall thickness can be up to Seamless steel pipes for diamond core drilling (GB3423-82) are seamless steel pipes used for drill pipes, core rods, and casings for diamond core drilling.com.[4] Seamless steel pipes for high-pressure boilers (GB5310-2008) are high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipes for the heating surface of water-tube boilers with high pressure and above. Seamless steel pipes are made of steel ingots or solid tube billets through perforation into capillary tubes, and then made by hot rolling, cold rolling or cold drawing. Generally, seamless steel pipes should be used for strength and flattening tests. It is largely used to convey fluids at low / medium pressures such as oil, gas, steam, water, air and also for mechanical applications. Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. The surface condition is usually black and hot-dipped galvanized.[5] High-pressure seamless steel pipes for fertilizer equipment (GB6479-2000) are high-quality carbon structural steel and alloy steel seamless steel pipes suitable for chemical equipment and pipelines with working temperature of -40~400 and working pressure of 10~30Ma . Generally, seamless steel pipes are made of 10Martensite Stainless Steel Tubes Suppliers, 20#, 30#, 35#, 45# and other high-quality carbon steels such as 16Mn, 5MnV and other low-alloy structural steels or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other composite steels that are hot-rolled or cold Rolled.Petroleum drilling pipe (YB528-65) is a seamless steel pipe that is thickened inside or outside at both ends of oil drilling.[3] Seamless steel pipes for low and medium pressure boilers (GB3087-2008) are high-quality carbon structural steels used to manufacture superheated steam pipes, boiling water pipes for low and medium pressure boilers of various structures, and superheated steam pipes and arch brick pipes for locomotive boilers. 10#, 20# and other low-carbon steel seamless pipes are mainly used for fluid transportation pipelines. Rolling has higher dimensional accuracy than hot rolling.

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