ASTM A387 Grade 5 Class 2 Steel Plate Traders,Suppliers,Stockists,Exporters Introduction:- ASTM A387 Grade 5 Class 2 Steel Plate Traders ASTM A387 Grade 5 Class 2 Steel Plates are chromium-molybdenum alloy steel plates designed for high-temperature and pressure vessel applications. These plates are well-known for their excellent resistance to