... price, 3. Good service. 8" Seamless Steel PipeASTM 20G, A106B, ST37, ST52, STK4001.seamless steel pipe ASTM A53 GR.B,Size:1 ... /4"-36"2.High-temperature operation samless steel pipe ASTM A106 GR.B,Size:1/4"-36"3 ... ,13.7-711.2mm8.DIN17175-1979,St35.8-St45.8/I,St35.8-St45.8/III, 15Mo3,13CrMo44,10CrMo910,1/4 ...