ASTM A812 Grade 65 is a kind of high strength low alloy hot rolled thin thickness material steel plates used to fabric multilayer pressure vessels. A812 is divided into two grades or levels :A812 Grade 65 and A812 Grade 80 . jwvivian98 (at) yahoo (dot) com Skype jw-vivian (at) hotmail (dot) com Standard: ASTM A-812/A-812M Dimension range :1.2mm -12mm x 500mm-1500mm x 1000mm-18000mm