ASTMB338 Gr2 titanium tubestandards: ASTMB337 338 ASTMB861 862Size OD5~114mm and above 114mmGr2 titanium tube is the most common use tubes for industry, such as tube heat exchanger, heat exchanger coi standards: ASTMB337 338 ASTMB861 862 Size OD5~114mm and above 114mm http://www.jctitanium.com