The titanium bent pipe Trade mark Manufacturing engineering State Specification (mm) Voluntary standards GR1,GR2,GR3,GR7 GR9,GR11,GR12 Cold-rolled, weld , weld - cold-rolled, fasten and press M Dia:5-110?.0-4.5?000-6000(Have not sewn cold-rolledly ), Dia:110?.0-8?000-2000(Welding ) Dia:150-400?.0-20?00-3000(Have not sewn ) ASTM,ASME