800 * 14 manufacturers Shanxi large caliber seamless steel pipe | seamless steel pipe production process, Cangzhou City Dongtai Steel Pipe Co., Ltd., sales manager left Yu Peng: 18730700585 Production of hot rolled large diameter seamless steel tubes and hot expanded diameter seamless steel pipe thermal expansion seamless steel pipe specifications for 325mm-1220mm thickest 120mm, thermal expansion seamless steel pipe can produce a non-national standard size, thermal expansion seamless pipe is what we often say that the thermal expansion of the density is relatively low but the contraction strong steel tube method with cross rolling or drawing method to expand a shortage of pipe diameter pipe finishing process. To steel pipe thickening in a short period of time, can produce non-standard, special types of seamless pipe, and the low-cost, high production efficiency, is international trends tube rolling fields. GB5310 (high-pressure boiler seamless pipe) on the specified outside diameter greater than or equal to 76mm, and wall thickness ≥ 14mm steel pipe Charpy V-longitudinal impact test at 20 ℃; the average impact energy of the three samples should not Below 40J, to allow a sample of the impact energy is lower than average, but not less than 70% of the average. Seamless steel pipe outside diameter> 219.1mm, and wall thickness ≥ 25mm steel pipe instead of longitudinal mechanical testing available the lateral mechanical properties test. Charpy V-lateral impact test at 20 ℃, large diameter pipe to do the transverse mechanical testing convenient. [(OD - Wall Thickness) * thickness] * 0.02466 = kg / m (weight per meter) large diameter seamless steel pipe Material Material: 10 # 20 # 35 # 45 # 16Mn 27SiMn 15CrMo 12Cr1MoV 10CrMo910 T91 P91 J55 K55 Q345 Cr5Mo2) 20 #, 35 #, 45 #, 16Mn, 27SiMn3) 10 #, 20 #, 35 #, 45 #, 16Mn, 27SiMn, 12Cr1MoV, 10CrMo910, 15CrMo.