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MIL-S-81591 1968 Edition, September 9, 1968
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STEEL, INVESTMENT CASTINGS, CARBON, AND CORROSION-RESISTING
Includes all amendments and changes through Interim Notice 1, February 23, 1993
Additional Comments: INACTIVE FOR NEW DESIGN
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This specification prescribes the requirements for carbon steel castings and corrosion-resistant steel castings made by the investment casting process.

Castings shall be of the compositions and conditions shown in Tables I and Ia, as specified (see 6.2). TABLE I COMPOSITIONS AND CONDITIONS
Composition
   number 1/                       Conditions
---------------------------------------------------------------
    IC-1020          As cast or annealed
    IC-1030          As cast, annealed or quenched and tempered
    IC-1040          As cast, annealed or quenched and tempered
    IC-1050          As cast, annealed or quenched and tempered

1/ Not necessarily identical to similar wrought designations.


TABLE Ia  COMPOSITIONS AND CONDITIONS TABLE Ia(Continued)  COMPOSITIONS AND CONDITIONS