ASTM A521-03

1.1 This specification covers untreated and heat-treated steel, closed-impression die forgings (Note 1) for general industrial use.

Note 1 – For the definition of a forging, refer General Requirements Specification A 788.

1.2 The Grades of forgings are as follows, the choice depending on design and stress or service to be imposed:

1.2.1 Grade CAUntreated, carbon steel forgings,

1.2.2 Grades CC, CC1, and CEAnnealed, normalized and tempered, carbon steel forgings,

1.2.3 Grade CFNormalized and tempered carbon steel forgings,

1.2.4 Grade CF1Double normalized and tempered carbon steel forgings,

1.2.5 Grade CGQuenched and tempered, or normalized, quenched and tempered carbon steel forgings,

1.2.6 Grade AAAnnealed, normalized, or normalized and tempered alloy steel forgings,

1.2.7 Grades AB and AC Normalized and tempered alloy steel forgings, and

1.2.8 Grades AD, AE, AF, AG, and AHNormalized, quenched, and tempered alloy steel forgings.

1.3 The values stated in inch-pound units are to be regarded as the standard.