ASTM B763/B763M-23

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B763/B763M − 15 (Reapproved 2022) B763/B763M − 23
Standard Specification for
Copper Alloy Sand Castings for Valve Applications
This standard is issued under the fixed designation B763/B763M; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification establishescovers requirements for copper alloy sand castings for valve applications. Nominal compositions
of the alloys defined by this specification are shown in Table 1.
NOTE 1—This specification does not cover Copper Alloy UNS Nos. C83600, C92200, C96200, and C96400. These alloys are also used in valve
applications. They are covered by the following specifications:
C83600: B62
C92200: B61
C96200: B369
C96400: B369
1.2 The castings produced under this specification are used in products which may be manufactured in advance and supplied for
sale from stock by the manufacturer.
1.3 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in
each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.4 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.
2. Referenced Documents
2.1 ASTM Standards:
B61 Specification for Steam or Valve Bronze Castings
B62 Specification for Composition Bronze or Ounce Metal Castings
B208 Practice for Preparing Tension Test Specimens for Copper Alloy Sand, Permanent Mold, Centrifugal, and Continuous
Castings
This specification is under the jurisdiction of ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.05 on Castings
and Ingots for Remelting.
Current edition approved May 1, 2022Oct. 1, 2023. Published May 2022October 2023. Originally approved in 1986. Last previous edition approved in 20152022 as
B763/B763M – 15.B763/B763M – 15 (2022). DOI: 10.1520/B0763_B0763M-15R22.10.1520/B0763_B0763M-23.
The UNS system for copper and copper alloys (see Practice E527) is a simple 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.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary 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
B763/B763M − 23
TABLE 1 Nominal Compositions
Copper Alloy Alumi- Man- Sili- Sele-
Classification Commercial Designation Copper Tin Lead Zinc Nickel Iron Bismuth
UNS No. num ganese con nium
1 1
Leaded red brass C83450 88 2 ⁄2 2 6 ⁄2 1 . . . . . . . . . . . . . . . . . .
C83800 83-4-6-7 or commercial red brass 83 4 6 7 . . . . . . . . . . . . . . . . . . . . .
Leaded semi-red brass C84400 81-3-7-9 or valve composition 81 3 7 9 . . . . . . . . . . . . . . . . . . . . .
1 1 1 1
C84800 76-2 ⁄2-6 ⁄2-15, or semi-red brass 76 2 ⁄2 6 ⁄2 15 . . . . . . . . . . . . . . . . . . . . .
Leaded yellow brass C85200 high-copper yellow brass 72 1 3 24 . . . . . . . . . . . . . . . . . . . . .
C85400 commercial No. 1 yellow brass 67 1 3 29 . . . . . . . . . . . . . . . . . . . . .
A
Yellow brass C85470 yellow brass 62.5 2.5 . . . 34.5 . . . . . . 0.5 . . . . . . . . . . . .
Leaded yellow brass C85700 leaded naval brass 61 1 1 37 . . . . . . . . . . . . . . . . . . . . .
High-strength yellow C86200 high-strength manganese bronze 63 . . . . . . 27 . . . 3 4 3 . . . . . . . . .
brass
C86300 high-strength manganese bronze 61 . . . . . . 27 . . . 3 6 3 . . . . . . . . .
1 1
C86400 leaded manganese bronze 58 1 1 38 . . . 1 ⁄2 ⁄2 . . . . . . . . .
C86500 No. 1 manganese bronze 58 . . . . . . 39 . . . 1 1 1 . . . . . . . . .
C86700 leaded manganese bronze 58 1 1 34 . . . 2 2 2 . . . . . . . . .
Silicon bronze and silicon C87300 silicon bronze 95 . . . . . . . . . . . . . . . . . . 1 4 . . . . . .
1 1
brass C87400 silicon brass 82 . . . ⁄2 14 . . . . . . . . . . . . 3 ⁄2 . . . . . .
C87500 silicon brass 82 . . . . . . 14 . . . . . . . . . . . . 4 . . . . . .
C87600 silicon bronze 89 . . . . . . 6 . . . . . . . . . . . . 5 . . . . . .
C87610 silicon bronze 92 . . . . . . 4 . . . . . . . . . . . . 4 . . . . . .
C89530 Bismuth-Selenium 86.5 4.7 . . . 8.0 . . . . . . . . . . . . . . . 1.5 .20
C89535 Bismuth 86.5 3.0 . . . 7.0 .65 . . . . . . . . . . . . 1.4 . . .
Bismuth brass C89537 bismuth brass 85 4.5 . . . 9 . . . . . . . . . . . . 0.9 1.7 . . .
B
C89570 bismuth brass 60.5 0.8 . . . 36.5 0.32 . . . 0.5 . . . . . . 1.0 . . .
C
C89720 bismuth brass 67.5 1 . . . 29.8 . . . . . . 0.5 . . . 0.5 0.7 . . .
Bismuth semi-red brass C89844 bismuth brass 84 ⁄2 4 . . . 8 . . . . . . . . . . . . . . . 3 . . .
Tin bronze and leaded tin C90300 88-8-0-4, or modified “G” bronze 88 8 . . . 4 . . . . . . . . . . . . . . . . . . . . .
bronze
C90500 88-10-0-2, on “G” bronze 88 10 . . . 2 . . . . . . . . . . . . . . . . . . . . .
C92300 87-8-1-4, or Navy PC 87 8 1 4 . . . . . . . . . . . . . . . . . . . . .
C92600 87-10-1-2 87 10 1 2 . . . . . . . . . . . . . . . . . . . . .
High-lead tin bronze C93200 83-7-7-3 83 7 7 3 . . . . . . . . . . . . . . . . . . . . .
C93500 85-5-9-1 85 5 9 1 . . . . . . . . . . . . . . . . . . . . .
C93700 80-10-10 80 10 10 . . . . . . . . . . . . . . . . . . . . . . . .
C93800 78-7-15 78 7 15 . . . . . . . . . . . . . . . . . . . . . . . .
C94300 71-5-24 71 5 24 . . . . . . . . . . . . . . . . . . . . . . . .
Nickel-tin bronze and C94700 nickel-tin bronze grade “A” 88 5 . . . 2 5 . . . . . . . . . . . . . . . . . .
leaded nickel-tin C94800 leaded nickel-tin bronze grade “B” 87 5 1 2 5 . . . . . . . . . . . . . . . . . .
bronze
C94900 leaded nickel-tin bronze grade “C” 80 5 5 5 5 . . . . . . . . . . . . . . . . . .
Aluminum bronze C95200 Grade A 88 . . . . . . . . . . . . 3 9 . . . . . . . . . . . .
C95300 Grade B 89 . . . . . . . . . . . . 1 10 . . . . . . . . . . . .
C95400 Grade C 85 . . . . . . . . . . . . 4 11 . . . . . . . . . . . .
C95410 84 . . . . . . . . . 2 4 10 . . . . . . . . . . . .
Silicon aluminum bronze C95600 Grade E 91 . . . . . . . . . . . . . . . 7 . . . 2 . . . . . .
Nickel aluminum bronze C95500 Grade D 81 . . . . . . . . . 4 4 11 . . . . . . . . . . . .
C95800 81.3 . . . . . . . . . 4.5 4 9 1.2 . . . . . . . . .
Leaded nickel bronze C97300 12 % leaded nickel silver 57 2 9 20 12 . . . . . . . . . . . . . . . . . .
C97600 20 % leaded nickel silver 64 4 4 8 20 . . . . . . . . . . . . . . . . . .
C97800 25 % leaded nickel silver 66 5 2 2 25 . . . . . . . . . . . . . . . . . .
Special alloys C99400 87 . . . . . . 4.4 3.0 3.0 1.6 . . . 1.0 . . . . . .
C99500 87 . . . . . . 1.5 4.5 4.0 1.7 . . . 1.3 . . . . . .
A
Phosphorus 0.13
B
Phosphorus 0.1
C
Antimony 0.07, Boron 0.001.
B369 Specification for Copper-Nickel Alloy Castings
B824 Specification for General Requirements for Copper Alloy Castings
E10 Test Method for Brinell Hardness of Metallic Materials
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
3. General Requirements
3.1 The following sections of Specification B824 form a part of this specification.
3.1.1 Terminology,
3.1.2 Other Requirements,
B763/B763M − 23
3.1.3 Dimensions, Mass, and Permissible Variations,
3.1.4 Workmanship, Finish, and Appearance,
3.1.5 Sampling,
3.1.6 Number of Tests and Retests,
3.1.7 Specimen Preparation,
3.1.8 Test Methods,
3.1.9 Significance of Numerical Limits,
3.1.10 Inspection,
3.1.11 Rejection and Rehearing,
3.1.12 Certification,
3.1.13 Test Report,
3.1.14 Product Marking,
3.1.15 Packaging and Package Marking, and
3.1.16 Supplementary Requirements.
4. Ordering Information
4.1 Include the following information when placing orders for product under this specification, as applicable:
4.1.1 Specification title, number, and year of approval;
4.1.2 Quantity of castings;
4.1.3 Copper Alloy UNS Number and temper (as-cast, heat-treated, etc.);
4.1.4 Pattern or drawing number and condition (as-cast, machined, etc.);
4.1.5 When castings are purchased for agencies of the U.S. Government, the Supplementary Requirements of Specification B824
may be specified.
4.2 The following requirements are optional and should be specified in the purchase order when required.
4.2.1 Pressure test or soundness requirements (Specification B824),
4.2.2 Approval of weld repair and records of repair (Section 10),
4.2.3 Certification (Specification B824),
4.2.4 Foundry test report (Specification B824),
4.2.5 Witness inspection (Specification B824),
4.2.6 Product marking (Specification B824),
B763/B763M − 23
4.2.7 Castings for seawater service (5.1).
5. Materials and Manufacture
5.1 For better corrosion resistance in sea water applications, castings in Copper Alloy UNS No. C95800 shall be given a temper
anneal heat treatment at 1250 °F 6 50 °F [675 °C 6 10 °C] 1200 °F to 1300 °F [650 °C to 705 °C] for 6 h minimum. Cooling shall
be by the fastest means possible that will not cause excessive distortion or cracking.
5.2 Copper Alloy UNS Nos. C94700, C95300, C95400, C95410, and C95500 may be supplied in the heat-treated condition to
obtain the higher mechanical properties shown in Table 4. Suggested heat treatments for these alloys and copper alloy UNS No.
C95520 are given in Table 5. Actual practice may vary by manufacturer.
5.3 Separately cast test bar coupons representing castings made in Copper Alloy UNS Nos. C94700HT, C95300HT, C95400HT,
C95410HT, and C95500HT shall be heat treated with the castings.
6. Chemical Composition
6.1 The castings shall conform to the requirements for major elements shown in Table 2.
6.2 These specification limits do not preclude the presence of other elements. Limits may be established and analysis required for
unnamed elements agreed upon between the manufacturer or supplier and the purchaser. Copper or zinc may be given as remainder
and may be taken as the difference between the sum of all elements analyzed and 100 %. When all named elements in Table 2 are
analyzed, their sum shall be as specified in Table 3.
7. Mechanical Properties
7.1 Mechanical properties shall be determined from separately cast test bars, and shall conform with the requirements shown in
Table 4.
8. Sampling
8.1 Copper Alloy UNS Nos. C86200, C86300, C86400, C86500, C86700, C95200, C95300, C95400, C95410, C95500, C95600,
C95800, C99400, and C99500 test bar castings shall be cast to the form and dimensions shown in Figs. 1 or 2 of Practice B208.
For all other alloys listed in this specification, test bars shall be cast to the form and dimensions shown in Figs. 2, 3 or 4 of Practice
B208.
9. Test Methods
9.1 Analytical chemical methods are given in Specification B824 (Test Methods section).
9.2 Brinell hardness readings, if specified on the purchase order, shall be taken in the grip end of the tension test bar and shall
be made in accordance with Test Method E10, except that a 3000 kg load shall be used.
10. Casting Repair
10.1 Copper Alloy UNS Nos. C95200, C95300, C95400, C95410, C95500, C95600, and C95800 included in this specification are
generally weldable. Weld repairs may be made at the manufacturer’s discretion provided each excavation does not exceed 20 %
of the casting section or wall thickness or 4 % of the casting surface area.
10.2 Excavations that exceed those described in 10.1 may be made at the manufacturer’s discretion except that when specified in
the ordering information (4.2.2), the weld procedure shall be approved by the purchaser and the following records shall be
maintained:
10.2.1 A
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