Titanium rings,Gr1titanium rings ASTM B381 ASTMB338 ASTMB337 DiaMax500mmxThickness:20~29mm Gr1Gr2 Titanium rings,Gr1titanium ringsGr1,Gr2,Gr3,Gr4,Gr5,Gr7,Gr11,Gr12,Gr23ASTM B381 ASTMB338 ASTMB337DiaMax.500mm and Thickness:20~29mmChemical processing, medical instruments high-tech spare parts high pressure titanium vesselWooden case T/T, L/C