... Dia:4mm~320mm, L< 15m Wall Thickness:0. Titanium Tubes: Grade:GR1,GR2,GR5(Ti6AL4V),GR7,GR12 Standard:ASTM Outer Dia:4mm ... Wall Thickness:0.4~10mmTitanium tubes and pipe:Material:Gr1, Gr2, Gr3, Gr4, Gr5, Gr7, Gr9, Gr11, Gr12 , Gr23,TI6AL4V ELI ... and chemical properties. Alloy grade 7, add little palladium in cp titanium and it has the most excellent corrosion-resistance. Of course ...