https://www.nickelalloytubes.com/products/gr.1-titanium-alloy-steel-pipe-tube.html ASTM B338 and ASME SB338 seamless and welded titanium and titanium alloy tubes for condensers, and heat exchangers, cover 28 grades of titanium and titanium alloy tubes for surface condensers, evaporators, and heat exchangers together with grades Gr1 for industrial applications, Gr2, Gr3, Gr7, Gr9, Gr12, Gr16, etc., welded and seamless titanium tube form, titanium tube is suitable.All Rights Reserved