Xinxiang City diameter steel pipe 800 * 18 preferred Cangzhou City Dongtai Pipe | factory direct, Cangzhou City Dongtai Steel Pipe Co., Ltd., sales manager at Zhiqiang: 13393378282 15932715956 0317-6289066 Production of hot rolled large diameter seamless steel pipe and thermal expansion of the caliber seamless steel pipe, thermal expansion seamless steel pipe specifications for 325mm-1220mm thickest 120mm, seamless steel pipe to produce a national standard size thermal expansion, thermal expansion seamless pipe thermal expansion of what we often say, the density relatively low but the contraction of a 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.