This specification covers aluminum-alloy investment castings. Unless otherwise specified, only aluminum alloy conforming to the requirements shall be used in the remelting furnace from which molten metal is taken for pouring directly into castings. The castings shall conform to the chemical composition requirements specified. The determination of chemical composition shall be made in accordance with suitable chemical (test methods E 34), or spectrochemical (test methods E 607 and E 1251) methods. Unless otherwise specified, only aluminum alloy conforming to the requirements shall be used in the remelting furnace from which molten metal is taken for pouring directly into castings. Foundry control shall consist of examination of castings by radiographic or other approved methods for determining internal discontinuities until the gating, pouring, and other foundry practices have been established to produce castings meeting the required quality standards. The tensile properties shall be determined in accordance with test methods B 557 and B 557M. Heat treatment of castings shall be performed in accordance with practice B 917/B 917M.

1.1 This specification covers all registered2 aluminum-alloy investment castings with the most common designated as shown in Table 1.

1.2 This specification is for aluminum-alloy investment castings used in general purpose applications. It may not address the mechanical properties integrity testing and verification required for highly loaded or safety critical applications.

1.3 It is recommended this specification be used to detail the responsibilities of the purchaser and producer for quality assurance tests, testing methods and process control requirements for nonregistered aluminum alloys. The chemical composition limits, heat treatment process and required mechanical properties shall be agreed upon by the purchaser and the producer.

1.4 Alloy and temper designations are in accordance with ANSI H35.1/H35.1 (M).

1.5 Unless the order specifies the “M” specification designation, the material shall be furnished to the inch-pound units.

1.6 For acceptance criteria for inclusion of new aluminum and aluminum alloys and their properties in this specification, see Annex A1 and Annex A2.

1.7 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated are not necessarily equivalents; therefore, to ensure conformance to the standard, each system shall be used independently from each other, and the values from the two systems shall not be combined.

1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.