... ,good quality & widely usage 3,multi model for choice Titanium tube--round tube:1.material:Gr1,Gr2,Gr3,Gr4,Gr5,GR7,GR9,GR11 ... good elogation and excellent corrossion-resisitance.CP grade 2 is widely used in the commerciallu pure Titanium.CP grade 3 is almost only ... ,physical and chemical properties.Alloy Gr7,add little palladium in cp Titanium and it has the most excellent corrosion-resistence Alloy Gr9 ...