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MIL-C-24707/1 1989 Edition, January 27, 1989
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CASTINGS, FERROUS, FOR MACHINERY AND STRUCTURAL APPLICATIONS
Includes all amendments and changes through Validation Notice 1, March 9, 2016
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This specification covers steel castings for machinery and structural applications below 775 degrees Fahrenheit (°F) where impact strength may be a consideration.

Castings shall be of the following grades, as specified (see 6.2).
    Grade A1Q of ASTM A 757       Grade E2Q of ASTM A 757
          A2Q of ASTM A 757             WCA of ASTM A 216
          C1Q of ASTM A 757             WCB of ASTM A 216
          E1Q of ASTM A 757             WCC of ASTM A 216
          E2N of ASTM A 757              4B of ASTM A 487
                                        14A of ASTM A 487