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1.1 This specification covers gray iron castings intended for general engineering use where tensile strength is a major consideration. Castings are classified on the basis of the tensile strength of the iron in separately cast test bars.
1.1.1 This specification subordinates chemical composition to tensile strength.
1.2 Castings produced to this specification are graded on the basis of minimum tensile strength obtained in special test coupons designed to standardize cooling rate. The tensile strength developed in certain casting sections may vary from test coupon values (see X1.2).
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 shall 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.
Federal StandardFederalStandardNo.12 Marking for Shipment (Civil Agencies)
A644 Terminology Relating to Iron Castings
E8 Test Methods for Tension Testing of Metallic Materials
Military StandardMIL-STD-129 Marking for Shipment and Storage Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://www.dodssp.daps.mil.
ICS Number Code 77.140.80 (Iron and steel castings)
UNSPSC Code 31101617(Grey iron sand casting)