... pipe for exchanger 2)OD3~114mm,L<=8000mm 3)ASTM B338 4)Gr1,Gr2,Gr3,Gr4,Gr5,Gr6,Gr12 ... -0Technology StandardOut Diameter (mm)Wall Thickness(mm) ASTM B338,ASME SB338,ASTM B337ASTM B861 3~50.2,0.3,0 ... GR1GR2 GR3 GR7 GR12 >10~150.5~2.0M ASTM B338>15~200.6~2.5M>20~300.6~3 ... 5M GR1GR2 GR3 GR7 GR12 160.5~1.0M ASTM B338 190.5~1.25M25,270.5~1.5M31 ... 5MGR1 GR2GR3 GR7 GR12 6~100.5~1.25M ASTM B338>10~150.5~1.5M>15~200.5 ...