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1.1 This specification covers carbon and low-alloy steel castings made by the investment casting process.
1.2 Fifteen grades of steel and two cobalt alloy grades are covered (see Appendix).
Note 1—An investment casting is one that is produced in a mold, obtained by investing (surrounding) an expendable pattern with a refractory slurry which is allowed to solidify. The expendable pattern may consist of wax, plastic, or other material and is removed by heating prior to filling the mold with liquid metal.
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
A957/A957M Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use
A997 Practice for Investment Castings, Surface Acceptance Standards, Visual Examination
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E139 Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials
ICS Number Code 77.140.80 (Iron and steel castings)
UNSPSC Code 11101704(Steel)