This specification establishes requirements for gear bronze alloy castings with Copper Alloy No. C90800, C91700, C90700, C91600, and C92900. The castings may be furnished as one of three types: static chill, centrifugal chill, or sand cast. The alloys shall be subject to tensile strength, yield strength, elongation, and Brinell hardness tests. The Brinell readings shall be taken on the grip end of the tension test bar as described in the specification.

1.1 This specification establishes requirements for alloys whose copper alloy numbers and nominal compositions are shown in Table 1. The castings may be furnished as one of three types: static chill, centrifugal chill, or sand cast.

1.2 The values stated in inch-pound units are to be regarded as the standard. SI values given in parentheses are for information purposes only.

TABLE 1 Nominal Composition