Materials shall be identified in the following ways:
(a) Cast flanges shall bemarkedwith theASTMspeci-fication, 1 grade identification symbol (letters and num-bers), and the melt number or melt identification.
(b) Plate flanges and forged flanges shall be marked with the ASTM specification 1 number and grade identi-fication symbol.
(c) Amanufacturermay supplement thesemandatory material markings with his trade designation for the material grade, but confusion of symbols shall be avoided.
(d) For flanges manufactured from material that meets the requirements for more than one specification or gradeof a specification listed inTable 1, seepara. 4.2.8.