Trademark Gr1, Gr2, Gr3, Gr4, Gr5, Gr7, Gr9, Gr23 Standard ASTM B337ASTM B338 Tensile Test Designation No. ConditionTensile Strength [M Pa]permanent set stress[greater than or equal] Elongation [%][greater than or equal] Gr1M280~420 170 24 Gr2 M 370~530 250 20 Gr3 M 440~620 320 18 Gr7 M 370~530 250 20[greater than or equal]440 ------ 18Titanium tube and it’s alloy tube Designation No. ...