ASTM-B26/B26M:12 pdf free download – Standard Specification for Aluminum-Alloy Sand Castings.
9. Foundry Control—Castings Produced for Governmental or Military Agencies, or Both
9.1 When specified, castings shall be produced under foundry control approved by the purchaser. 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 quality standards furnished by the purchaser or agreed upon between the purchaser and the producer. When foundry practices have been so established, the production method shall not be significantly changed without demonstrating to the satisfaction of the purchaser that the change does not adversely affect the quality of the castings. Minor changes in pouring temperature of 50°F [±28°C] from the established nominal temperature are permissible.
10. Tensile Properties
10.1 The separately cast test specimens representing the castings shall meet the mechanical properties prescribed in Table 2.
10.2 Although Alloys 705.0, 707.0, 712.0, and 713.0 are most frequently used in the naturally aged condition, by agreement between the producer and the purchaser, the castings may he artificially aged to the T5 temper. The producer and the purchaser may also agree to base the acceptance of castings on artificially aged test bars. The conditions of artificial aging shown in Practice B9171B917M shall be employed unless other conditions are accepted by mutual consent.
10.3 When specified, the tensile strength, yield strength. and elongation values of specimens cut from castings shall be not less than 75 % of the tensile and yield strength values and not less than 25 % of the elongation values specified in Table 2 [Table 4]. The measurement of the elongation is not required for test specimens cut from castings if 25 % of the specified minimum elongation value published in Table 2 [Table 4] is 0.5
or less. If grade D quality castings as described in Table 3 are specified, no tensile tests shall be specified nor tensile requirements be met on specimens cut from castings.
11. Workmanship, Finish, and Appearance
11.1 The finished castings shall be uniform in composition and free of blowholes. cracks, shrinks, and other discontinuities except as designated and agreed upon as acceptable by the Purchaser.
12. Number of Tests and Retests
12.1 Unless otherwise agreed upon between the purchaser and producer. a minimum of two tension test specimens shall be separately cast and tested to represent the following:
12.1.1 Not more than 4000 lb [2000 kg] of clean castings (gates and risers removed) or a single casting poured from one furnace.
12.1.2 The castings poured continuously from one furnace in not more than eight consecutive hours.