... 3.grade:GR.B,X42,X46,52,X56,X60,X65,X70, 4.for converying oil,gas,water APL5L pipe ... GR.B,X42,X46,52,X56,X60,X65,X70, PSL1&PSL2API5L PSL1PSL2GR.B X42 X46 X52 X56 X60 ... X65 SIZE diameter*thickness(MM)17.1*2.313/8" ... more grades according to mutual agreement . What is more,hot dip galvanizing,PE coating,FBE coating is provided. API 5L line pipe