ASME SA832 Grade 21V is a kind of Cr-Mo-V alloy steel plates material used to fabric pressure vessels. SA832 is divided into three grades or levels : SA832 Grade 21V, SA832 Grade 22V, SA832 Grade 23V. jwvivian98 (at) yahoo (dot) com Skype jw-vivian (at) hotmail (dot) com Standard: ASME SA-832/SA-832M Thickness :3mm -500mm Width :1000mm-4000mm Length :1000mm-18000mm