ASTM A203/A203M Standard Specification for Pressure Vessel Plates, Alloy Steel, Nickel,alloy steel, pressure containing parts, pressure vessels.The heat treatment requirements for all plates are presented, and all plates under Grades A, B, D, and E shall be normalized as required. ASTM A203/A203M Standard main steel grade:A203 Grade E(A203GRE),ASTM A203 Grade D(A203GRD),ASTM A203 Grade B(A203GRB).