ASTM B770-21
(Specification)Standard Specification for Copper-Beryllium Alloy Sand Castings for General Applications
Standard Specification for Copper-Beryllium Alloy Sand Castings for General Applications
ABSTRACT
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.
SCOPE
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
67.2
31.0
1.2
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 that are provided for information only and are not considered standard.
1.3 The following safety hazard caveat pertains only to the test methods described in this specification: 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, health, and environmental practices and determine the applicability of regulatory requirements prior to use.
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.
General Information
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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.
Designation:B770 −21
Standard Specification for
Copper-Beryllium Alloy Sand Castings for General
1
Applications
This standard is issued under the fixed designation B770; 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* 2. Referenced Documents
2.1 The following documents in the current issue of the
1.1 This specification establishes requirements for sand
Annual Book of ASTM Standards form a part of this specifica-
castingsproducedfromcopper-berylliumalloys.Thefollowing
tion to the extent referenced herein:
alloys are covered:
2
Copper Alloy 2.2 ASTM Standards:
Designation Copper Nickel Beryllium
UNS No.
B30 Specification for Copper Alloys in Ingot and Other
C81400 70C 99.1 . 0.06
Remelt Forms
C82000 10C 97 . 0.5
B208 Practice for Preparing Tension Test Specimens for
C82200 3C, 14C 98 2.0 0.5
A A
C82400 165C, 165CT 97.8 . 1.7 Copper Alloy Sand, Permanent Mold, Centrifugal, and
A A
C82500 20C, 20CT 97.2 . 2.0
Continuous Castings
C82510 21C 96.6 . 2.0
A A B601 Classification forTemper Designations for Copper and
C82600 245C, 245CT 96.8 . 2.4
A A
C82800 275C, 275CT 96.6 . 2.6 Copper Alloys—Wrought and Cast
C96700 72C 67.2 31.0 1.2
B824 Specification for General Requirements for Copper
Alloy Castings
A
Whenfine-grainedcastingsarespecified,0.02to0.12titaniumisaddedforgrain
B846 Terminology for Copper and Copper Alloys
refinement, usually in the remelt ingot. See Specification B30.
B950 Guide for Editorial Procedures and Form of Product
1.2 Units—The values stated in inch-pound units are to be
Specifications for Copper and Copper Alloys
regarded as standard. The values given in parentheses are
E8/E8M Test Methods for Tension Testing of Metallic Ma-
mathematical conversions to SI units that are provided for
terials
information only and are not considered standard.
3. General Requirements
1.3 The following safety hazard caveat pertains only to the
3.1 The following sections of Specification B824 constitute
test methods described in this specification:Thisstandarddoes
a part of this specification:
not purport to address all of the safety concerns, if any,
3.1.1 Terminology
associatedwithitsuse.Itistheresponsibilityoftheuserofthis
3.1.2 Material and Manufacture
standard to establish appropriate safety, health, and environ-
3.1.3 Chemical Composition,
mental practices and determine the applicability of regulatory
3.1.4 Dimensions and Permissible Variations
requirements prior to use.
3.1.5 Workmanship, Finish, and Appearance
1.4 This international standard was developed in accor-
3.1.6 Sampling
dance with internationally recognized principles on standard-
3.1.7 Number of Tests and Retests
ization established in the Decision on Principles for the
3.1.8 Specimen Preparation
Development of International Standards, Guides and Recom-
3.1.9 Test Methods
mendations issued by the World Trade Organization Technical
3.1.10 Significance of Numerical Limits
Barriers to Trade (TBT) Committee.
3.1.11 Inspection
3.1.12 Rejection and Rehearing
3.1.13 Certification,
1
ThisspecificationisunderthejurisdictionofASTMCommitteeB05onCopper
and Copper Alloys and is the direct responsibility of Subcommittee B05.05 on
2
Castings and Ingots for Remelting. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2021. Published November 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1987. Last previous edition approved in 2015 as B770 – 15. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0770-21. 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
1
---------------------- Page: 1 ----------------------
B770−21
3.1.14 Test Reports 8. Temper
3.1.15 Packaging and Package Marking
8.1 The standard tempers for products described in this
3.2 In addition, when a section with a title identical to that specification are given in Table 2. See Classification B601.
referenced in 3.1 appears in this specification, it contains 8.1.1 Cast, solution heat treated, and precipitation heat
additional requirements that supplement those appearing in treated temper TF00.
Specification B824. 8.1.2 As-sand-cast temper M01.
8.1.3
...
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: B770 − 15 B770 − 21
Standard Specification for
Copper-Beryllium Alloy Sand Castings for General
1
Applications
This standard is issued under the fixed designation B770; 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 establishes requirements for copper-beryllium alloy sand castings for general applications and nominal
compositions alloys defined by this specification are shown sand castings produced from copper-beryllium alloys. The following
alloys are covered:
Copper Alloy
Designation Copper Nickel Beryllium
UNS No.
C81400 70C 99.1 . 0.06
C82000 10C 97 . 0.5
C82200 3C, 14C 98 2.0 0.5
A A
C82400 165C, 165CT 97.8 . 1.7
A A
C82500 20C, 20CT 97.2 . 2.0
C82510 21C 96.6 . 2.0
A A
C82600 245C, 245CT 96.8 . 2.4
A A
C82800 275C, 275CT 96.6 . 2.6
C96700 72C 67.2 31.0 1.2
A
When fine-grained castings are specified, 0.02 to 0.12 titanium is added for grain refinement, usually in the remelt ingot. See Specification B30.
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 that are provided for information only and are not considered standard.
1.3 The following safety hazard caveat pertains only to the test methods described in this specification: 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 safety, health, and healthenvironmental practices and determine the applicability of regulatory
requirements prior to use.
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 The following documents in the current issue of the Annual Book of ASTM Standards form form a part of this specification
to the extent referenced herein:
1
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, 2015Oct. 1, 2021. Published May 2015November 2021. Originally approved in 1987. Last previous edition approved in 20102015 as
B770 – 10.B770 – 15. DOI: 10.1520/B0770-15.10.1520/B0770-21.
*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
1
---------------------- Page: 1 ----------------------
B770 − 21
2
2.2 ASTM Standards:
B30 Specification for Copper Alloys in Ingot and Other Remelt Forms
B208 Practice for Preparing Tension Test Specimens for Copper Alloy Sand, Permanent Mold, Centrifugal, and Continuous
Castings
B601 Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
B824 Specification for General Requirements for Copper Alloy Castings
B846 Terminology for Copper and Copper Alloys
E527B950 PracticeGuide for Numbering Metals and Alloys in the Unified Numbering System (UNS)Editorial Procedures and
Form of Product Specifications for Copper and Copper Alloys
E8/E8M Test Methods for Tension Testing of Metallic Materials
3. General Requirements
3.1 The following sections of Specification B824 constitute a part of this specification:
3.1.1 Terminology,Terminology
3.1.2 Material and Manufacture,Manufacture
3.1.3 Chemical Composition,
3.1.4 Dimensions and Permissible Variations,Variations
3.1.5 Workmanship, Finish, and Appearance,Appearance
3.1.6 Sampling,Sampling
3.1.7 Number of Tests and Retests,Retests
3.1.8 Specimen Preparation,Preparation
3.1.9 Test Methods,Methods
3.1.10 Significance of Numerical Limits,Limits
3.1.11 Inspection,Inspection
3.1.12 Rejection and Rehearing,Rehearing
3.1.13 Certification,
3.1.14 Mill Test Report, andReports
3.1.15 Packaging and Package Marking.Marking
3.2 In addition, when a section with a title identical to that referenced in 3.1 appears in thi
...
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