... ,Gr9,Gr10,Gr11,Gr12,BT1-00,BT1-0 Technology StandardOut Diameter (mm)Wall Thickness(mm) ASTM B338ASME SB338 ASTM B337ASTM B8613~50.2 ... ,Defence,Energy,Medical,Performance SportsTitanium pipe for heat changerGradeDiameter(mm) thickness(mm) stateManufacturing standardGR1GR2 GR3 GR7 GR12 >10~150.5~2 ...