... 1,GR.2,GR.3,GR.4, GR5,GR.7,GR.12,GR.23, 6AL4V, 6AL-4V ELI thickness: ... -60mm special for shipbuilding use7. Quality Assurance (1) According to globally recognized standards, such as ASTM, AMS, ASME,JIS, ... 2000 MT yearly----Delivery on time.----Professional service.Grade 7 Chemical composition(weight%)(Maximum values unless range is shown) ... GR.1,GR.2,GR.3,GR.4, GR5,GR.7,GR.12,GR.23, 6AL4V ASTM B265, ASTM F136/ ...