... /API 5L GR.B, B,1/4-28,13.7-711.2mm5.ASTM A179,A1926.-40°-101°ASTM A333,:GR.A ... .6,GR.7,GR.3,:1/4-28,13.7-711.2mm7.DIN2448/1629,St37,St44,St52,1/4-28,13 ... .7-711.2mm8.DIN17175-1979,St35.8-St45.8/I,St35.8 ... .8/III, 15Mo3,13CrMo44,10CrMo910,1/4-28,13.7-711.2mm 8" Seamless Steel Pipe