ASTM B770-02
(Specification)Standard Specification for Copper-Beryllium Alloy Sand Castings for General Applications
Standard Specification for Copper-Beryllium Alloy Sand Castings for General Applications
SCOPE
1.1 This specification establishes requirements for copper-beryllium alloy sand castings for general applications and nominal compositions alloys defined by this specification are shown in Table 1.
1.2 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units, which are provided for information only.
1.3 The following safety hazard caveat pertains only to the test methods described in this specification.
1.4 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 and health practices and determine the applicability of regulatory requirements prior to use.
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Designation: B 770 – 02
Standard Specification for
Copper-Beryllium Alloy Sand Castings for General
1
Applications
This standard is issued under the fixed designation B 770; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
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1. Scope* B 846 Terminology for Copper and Copper Alloys
4
E 527 Practice for Numbering Metals and Alloys (UNS)
1.1 This specification establishes requirements for copper-
beryllium alloy sand castings for general applications and
3. General Requirements
nominal compositions alloys defined by this specification are
2 3.1 The following sections of Specification B 824 constitute
shown in Table 1.
a part of this specification:
1.2 Units—The values stated in inch-pound units are to be
3.1.1 Terminology,
regarded as standard. The values given in parentheses are
3.1.2 Material and Manufacture,
mathematical conversions to SI units, which are provided for
3.1.3 Chemical Composition,
information only.
3.1.4 Dimensions and Permissible Variations,
1.3 The following safety hazard caveat pertains only to the
3.1.5 Workmanship, Finish and Appearance,
test methods described in this specification.
3.1.6 Sampling,
1.4 This standard does not purport to address all of the
3.1.7 Number of Tests and Retests,
safety concerns, if any, associated with its use. It is the
3.1.8 Specimen Preparation,
responsibility of the user of this standard to establish appro-
3.1.9 Test Methods,
priate safety and health practices and determine the applica-
3.1.10 Significance of of Numerical Limits,
bility of regulatory requirements prior to use.
3.1.11 Inspection,
2. Referenced Documents 3.1.12 Rejection and Rehearing,
3.1.13 Certification,
2.1 The following documents in the current issue of the
3.1.14 Mill Test Report, and
BookofStandardsformapartofthisspecificationtotheextent
3.1.15 Packaging and Package Marking.
referenced herein:
3.2 In addition, when a section with a title identical to that
2.2 ASTM Standards:
3
referenced in 3.1 appears in this specification, it contains
B30 Specification for Copper-Base Alloys in Ingot Form
additional requirements which supplement those appearing in
B 208 Practice for Preparing Tension Test Specimens for
Specification B 824.
Copper-Base Alloys for Sand, Permanent Mold, Centrifu-
3
gal and Continuous Castings
4. Terminology
B 601 Practice for Temper Designations for Copper and
3 4.1 For definitions of terms relating to copper and copper
Copper Alloys—Wrought and Cast
alloys, refer to Terminology B 846.
B 824 Specification for General Requirements for Copper
3
Alloy Castings
5. Ordering Information
5.1 Include the following information for orders for prod-
1
This practice is under the jurisdiction ofASTM Committee B05 on Copper and
uct:
CopperAlloys and is the direct responsibility of Subcommittee B05.05 on Castings
5.1.1 ASTM designation number, title, and year of issue,
and Ingots for Remelting.
5.1.2 Copper Alloy UNS Number designation,
Current edition approved April 10, 2002. Published June 2002. Originally
published as B 770 – 87. Last previous edition B 770 – 96. 5.1.3 Temper,
2
The UNS system for copper and copper alloys (see Practice E 527) is a simple
5.1.4 Quantity of castings required,
expansion of the former standard designation system accomplished by the addition
of a prefix “C” and a suffix “00”. The suffix can be used to accommodate
composition variations of the base alloy.
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Annual Book of ASTM Standards, Vol 02.01. Annual Book of ASTM Standards, Vol 01.01.
*ASummary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B770–02
TABLE 1 Nominal Compositions
Copper Alloy Previous
Copper Nickel Silicon Beryllium Cobalt Chromium Iron Zirconium Tin Manganese
UNS No. Designation
C81400 70C 99.1 . . 0.06 . 0.8 . . . .
C82000 10C 97 . . 0.5 2.5 . . . . .
C82200 3C, 14C 98 1.5 . 0.5 . . . . . .
A A
C82400 165C, 165CT 97.8 . . 1.7 0.5 . . . . .
A A
C82500 20C, 20CT 97.2 . 0.3 2.0 0.5 . . . . .
C82510 21C 96.6 . 0.3 2.0 1.1 . . . . .
A A
C82600 245C, 245CT 96.8 . 0.3 2.4 0.5 . . . . .
A A
C82800 275C, 275CT 96.6 . 0.3 2.6 0.5 . . . . .
C96700 72C 67.2 31.0 . 1.2 . . 0.6 0.3 0.3 0.6
A
When fine-grained castings are specified, 0.02 to 0.12 Ti is added for grain refinement, usually in the remelt ingot. See SpecificationB30.
5.1.5
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