ASME SA812 Grade 80 is a kind of high strength low alloy hot rolled thin thickness material steel plates used to fabric multilayer pressure vessels. SA812 is divided into two grades or levels :SA812 Grade 65 and SA812 Grade 80 jwvivian98 (at) yahoo (dot) com Skype jw-vivian (at) hotmail (dot) com Standard: ASME SA-812/SA-812M Dimension range :1.2mm -12mm x 500mm-1500mm x 1000mm-18000mm