ASTM B770-21

Current Revision
Standard Specification for Copper-Beryllium Alloy Sand Castings for General Applications

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This specification establishes requirements for copper-beryllium alloy sand castings for general applications and covers Copper Alloy UNS Nos. C81400, C82000, C82200, C82400, C82500, C82510, C82600, C82800, and C96700.

The product shall be manufactured by casting and thermal treatment. Castings shall conform to the chemical composition requirements prescribed for copper, nickel, silicon, beryllium, cobalt, chromium, iron, zirconium, tin, and manganese.

The standard temper designations include TF00 (cast, solution and precipitation heat treated) and M01 (as sand cast).

Requirements for precipitation and solution heat-treatments of castings for the purpose of determining conformance to the specified mechanical properties including tensile strength, yield strength, and elongation are detailed.

Special combinations of properties such as increased ductility, electrical conductivity, dimensional accuracy, and endurance life may be obtained by special precipitation heat-treatments.

Tension tests shall also meet the mechanical property requirements.

1.1 This specification establishes requirements for sand castings produced from copper-beryllium alloys. The following alloys are covered:

Copper Alloy
UNS No.

Designation

Copper

Nickel

Beryllium

C81400

70C

99.1

...

0.06

C82000

10C

97

...

0.5

C82200

3C, 14C

98

2.0

0.5

C82400A

165C, 165CTA

97.8

...

1.7

C82500A

20C, 20CTA

97.2

...

2.0

C82510

21C

96.6

...

2.0

C82600A

245C, 245CTA

96.8

...

2.4

C82800A

275C, 275CTA

96.6

...

2.6

C96700

72C

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