ASTM B740-21

Standard Specification for Copper-Nickel-Tin Spinodal Alloy Strip

ABSTRACT
This specification establishes the requirements for copper-nickel-tin spinodal alloy strips with Copper Alloy UNS Nos. C72700, C72900, and C72650. Tempers are available as follows: TB00 (solution heat treated), TD01 to TD12 (solution heat treated and cold worked), TX00 or TS01 to TS12 (spinodal hardened), or TM00 to TM08 (mill hardened). Materials shall be prepared and tested accordingly to examine their conformance to mechanical (tensile and yield strength, elongation, ductility, and bend ratio), chemical composition, and grain size requirements. Retests shall be performed on any lot of material that fails to adhere to specified requirements due to inadequate heat treatment, or fails to meet bend test requirements.
SCOPE
1.1 This specification establishes requirements for copper-nickel-tin alloy strip for Copper Alloy UNS Nos. C72700, C72900, and C72650 in the following alloys:    
Copper Alloy UNS No.  
Nominal Composition Weight %  
Copper  
Nickel  
Tin  
C72700  
85  
9  
6  
C72900  
77  
15  
8  
C72650  
87.5  
7.5  
5  
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 method(s) described in this specification.  
1.3.1 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 limitations 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

• Status: Published
• Publication Date: 30-Sep-2021
• ICS: 77.150.30 - Copper products
• Technical Committee: B05 - Copper and Copper Alloys
• Drafting Committee: B05.01 - Plate, Sheet, and Strip

Standards Content (Sample)

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:B740 −21
Standard Specification for
1
Copper-Nickel-Tin Spinodal Alloy Strip
This standard is issued under the fixed designation B740; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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* B248MSpecificationforGeneralRequirementsforWrought
Copper and Copper-Alloy Plate, Sheet, Strip, and Rolled
1.1 This specification establishes requirements for copper-
Bar (Metric)
nickel-tin alloy strip for Copper Alloy UNS Nos. C72700,
B598Practice for Determining Offset Yield Strength in
C72900, and C72650 in the following alloys:
3
Tension for Copper Alloys (Withdrawn 2019)
Nominal Composition Weight %
Copper Alloy UNS No.
B601ClassificationforTemperDesignationsforCopperand
Copper Nickel Tin
C72700 85 9 6 Copper Alloys—Wrought and Cast
C72900 77 15 8
B820Test Method for BendTest for Determining the Form-
C72650 87.5 7.5 5
ability of Copper and Copper Alloy Strip
1.2 Units—The values stated in inch-pound units are to be
B846Terminology for Copper and Copper Alloys
regarded as standard. The values given in parentheses are
E3Guide for Preparation of Metallographic Specimens
mathematical conversions to SI units that are provided for
E8/E8MTest Methods for Tension Testing of Metallic Ma-
information only and are not considered standard.
terials
E75Test Methods for Chemical Analysis of Copper-Nickel
1.3 The following safety hazard caveat pertains only to the
3
test method(s) described in this specification. and Copper-Nickel-Zinc Alloys (Withdrawn 2010)
E112Test Methods for Determining Average Grain Size
1.3.1 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the E478Test Methods for ChemicalAnalysis of CopperAlloys
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter- 3. General Requirements
mine the applicability of regulatory limitations prior to use.
3.1 The following sections of Specification B248 constitute
1.4 This international standard was developed in accor-
a part of this specification:
dance with internationally recognized principles on standard-
3.1.1 Terminology
ization established in the Decision on Principles for the
3.1.2 Materials and Manufacture
Development of International Standards, Guides and Recom-
3.1.3 Sampling
mendations issued by the World Trade Organization Technical
3.1.4 Number of Tests and Retests
Barriers to Trade (TBT) Committee.
3.1.5 Dimensions and Permissible Variations
3.1.6 Workmanship, Finish, and Appearance
2. Referenced Documents
3.1.7 Significance of Numerical Limits
2
2.1 ASTM Standards:
3.1.8 Inspection
B248Specification for General Requirements for Wrought
3.1.9 Rejection and Rehearing
Copper and Copper-Alloy Plate, Sheet, Strip, and Rolled
3.1.10 Certification
Bar
3.1.11 Test Reports
3.1.12 Packaging and Package Marking
1
3.2 In addition, when a section with a title identical to that
This specification is under the ASTM Committee B05 on Copper and Copper
Alloys and is the direct responsibility of Subcommittee B05.01 on Plate, Sheet, and
referenced in 3.1, above, appears in this specification, it
Strip.
containsadditionalrequirementsthatsupplementthoseappear-
Current edition approved Oct. 1, 2021. Published November 2021. Originally
ing in Specification B248.
approved in 1984. Last previous edition approved in 2015 as B740–09 (2015).
DOI: 10.1520/B0740-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
*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

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B740−21
4. Terminology 7.2 These composition limits do not preclude the presence
ofotherelements.Byagreementbetweenthemanufacturerand
4.1 For definitions of terms related to copper and copper
purchaser, limits may be established and analysis required for
alloys, refer to Terminology B846.
unnamed elements.
5. Ordering Information
7.3 For alloys in which copper is listed as “remainder,”
cop
...

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: B740 − 09 (Reapproved 2015) B740 − 21
Standard Specification for
1
Copper-Nickel-Tin Spinodal Alloy Strip
This standard is issued under the fixed designation B740; 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-nickel-tin alloy strip for Copper Alloy UNS Nos. C72700, C72900, and
C72650 in the following alloys:
Nominal Composition Weight %
Copper Alloy UNS No.
Copper Nickel Tin
C72700 85 9 6
C72900 77 15 8
C72650 87.5 7.5 5
1.2 Units—The values stated in inch-pound units and the values stated in SI units in Table 5 are to be regarded as standard, except
for grain size which is stated in metric units only. standard. The values given in parentheses are mathematical conversions to SI
units andthat are provided for information only and are not considered standard.
1.3 The following safety hazard caveat pertains only to the test method(s) described in this specification.
1.3.1 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 limitations 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 of the issue in effect on date of material purchase form a part of this specification to the extent
referenced herein:
2
2.1 ASTM Standards:
B248 Specification for General Requirements for Wrought Copper and Copper-Alloy Plate, Sheet, Strip, and Rolled Bar
1
This specification is under the ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.01 on Plate, Sheet, and Strip.
Current edition approved May 1, 2015Oct. 1, 2021. Published June 2015November 2021. Originally approved in 1984. Last previous edition approved in 20092015 as
B740 – 09.B740 – 09 (2015). DOI: 10.1520/B0740-09R15.10.1520/B0740-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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
1

---------------------- Page: 1 ----------------------
B740 − 21
B248M Specification for General Requirements for Wrought Copper and Copper-Alloy Plate, Sheet, Strip, and Rolled Bar
(Metric)
3
B598 Practice for Determining Offset Yield Strength in Tension for Copper Alloys (Withdrawn 2019)
B601 Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
B820 Test Method for Bend Test for Determining the Formability of Copper and Copper Alloy Strip
B846 Terminology for Copper and Copper Alloys
E3 Guide for Preparation of Metallographic Specimens
E8/E8M Test Methods for Tension Testing of Metallic Materials
3
E75 Test Methods for Chemical Analysis of Copper-Nickel and Copper-Nickel-Zinc Alloys (Withdrawn 2010)
E290E112 Test Methods for Bend Testing of Material for DuctilityDetermining Average Grain Size
E478 Test Methods for Chemical Analysis of Copper Alloys
3. General Requirements
3.1 The following sections of Specification B248 constitute a part of this specification:
3.1.1 Terminology,Terminology
3.1.2 Materials and Manufacture,Manufacture
3.1.3 Sampling
3.1.4 Number of Tests and Retests
3.1.5 Dimensions and Permissible Variations,Variations
3.1.6 Workmanship, Finish, and Appearance,Appearance
3.1.5 Sampling,
3.1.7 Significance of Numerical Limits,Limits
3.1.8 Inspection,Inspection
3.1.9 Rejection and Rehearing,Rehearing
3.1.10 Certification,Certification
3.1.11 Test Reports, andReports
3.1.12 Packaging and Package Marking.Marking
3.2 In add
...