... quality & widely usage 3,multi model for choice Titanium tube--round tube:1.material:Gr1,Gr2,Gr3,Gr4,Gr5,GR7,GR9 ... grade 2 is widely used in the commerciallu pure Titanium.CP grade 3 is almost only used in ... chemical properties.Alloy Gr7,add little palladium in cp Titanium and it has the most excellent corrosion-resistence ... quality and resonable price ,welcome any inquiries! Titanium tube--round tube