Hefei large diameter steel pipe | Hefei Q345B large diameter steel pipe | seamless steel pipe plant in Hefei, 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 diameter seamless steel pipe, thermal expansion of the largest seamless steel pipe specifications for 325mm-1220mm most thickness of 120 mm, the thermal expansion seamless steel pipe can produce a non-national standard size, thermal expansion seamless pipe thermal expansion of what we often say, the density is relatively low But the contraction of a strong steel pipe cross rolling method 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.