ASTM B768-11(2016)

Standard Specification for Copper-Cobalt-Beryllium Alloy and Copper-Nickel-Beryllium Alloy Strip and Sheet

ABSTRACT
This specification establishes the requirements for strips and sheets of copper-cobalt-beryllium and copper-nickel-beryllium alloys with Copper Alloy UNS Nos. C17410, C17450, and C17460. The materials for manufacture shall be cast billets or slabs of such purity and soundness as to be suitable for processing by hot-working, cold-working, and annealing to produce a uniform wrought structure in the finished product, which shall be rolled to finished size and heat treated when required to meet temper properties. Products shall be sampled and prepared, then tested accordingly to examine their conformance to dimensional (thickness, length, width, straightness, and edge contours), mechanical (tensile and yield strength, Rockwell hardness, and elongation), electrical conductivity, and chemical composition requirements.
SCOPE
1.1 This specification establishes the requirements for copper-cobalt-beryllium and copper-nickel-beryllium strip and sheet of the following alloys:    
Nominal Composition, %  
Copper Alloy UNS No.2  
Beryllium  
Cobalt  
Nickel  
C17410  
0.3  
0.5  
. . .    
C17450  
0.3  
. . .  
0.8  
C17460  
0.3  
. . .  
1.2  
1.2 Units—Values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units, which 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:  
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Sep-2016
• ICS: 77.150.30 - Copper products
• Technical Committee: B05 - Copper and Copper Alloys
• Drafting Committee: B05.01 - Plate, Sheet, and Strip

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B768 −11 (Reapproved 2016)
Standard Specification for
Copper-Cobalt-Beryllium Alloy and Copper-Nickel-Beryllium
Alloy Strip and Sheet
This standard is issued under the fixed designation B768; 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* Strip, and Rolled Bar
B248 Specification for General Requirements for Wrought
1.1 This specification establishes the requirements for
Copper and Copper-Alloy Plate, Sheet, Strip, and Rolled
copper-cobalt-beryllium and copper-nickel-beryllium strip and
Bar
sheet of the following alloys:
B601 Classification forTemper Designations for Copper and
Nominal Composition, %
Copper Alloys—Wrought and Cast
Copper Alloy UNS No. Beryllium Cobalt Nickel
B846 Terminology for Copper and Copper Alloys
C17410 0.3 0.5 . . .
E8/E8M Test Methods for Tension Testing of Metallic Ma-
C17450 0.3 . . . 0.8
terials
C17460 0.3 . . . 1.2
E18 Test Methods for Rockwell Hardness of Metallic Ma-
1.2 Units—Values stated in inch-pound units are to be
terials
regarded as the standard. The values given in parentheses are
E255 Practice for Sampling Copper and Copper Alloys for
mathematical conversions to SI units, which are provided for
the Determination of Chemical Composition
information only and are not considered standard.
E527 Practice for Numbering Metals and Alloys in the
1.3 The following safety hazard caveat pertains only to the
Unified Numbering System (UNS)
test methods described in this specification:
1.3.1 This standard does not purport to address all of the 3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 For definitions of terms related to copper and copper
responsibility of the user of this standard to establish appro-
alloys, refer to Terminology B846.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. General Requirements
4.1 ThefollowingsectionsofSpecificationB248constitutes
2. Referenced Documents
a part of this specification
2.1 The following documents of the issue in effect on date
4.1.1 Terminology.
of material purchase form a part of this specification to the
4.1.2 Materials and Manufacture.
extent referenced herein:
4.1.3 Workmanship, Finish, and Appearance.
4.1.4 Sampling.
2.2 ASTM Standards:
4.1.5 Number of Tests and Retests.
B194 Specification for Copper-BerylliumAlloy Plate, Sheet,
4.1.6 Specimen Preparation.
4.1.7 Test Methods.
1 4.1.8 Significance of Numerical Limits.
ThisspecificationisunderthejurisdictionofASTMCommitteeB05onCopper
andCopperAlloysandisthedirectresponsibilityofSubcommitteeB05.01onPlate,
4.1.9 Inspection.
Sheet, and Strip.
4.1.10 Rejection and Rehearing.
Current edition approved Oct. 1, 2016. Published October 2016. Originally
4.1.11 Certification.
approved in 1987. Last previous edition approved in 2011 as B768–11. DOI:
4.1.12 Test Report.
10.1520/B0768-11R16.
The UNS system for copper and copper alloys (see Practice E527) is a simple
4.1.13 Packaging and Marking.
expansion of the former standard designation system accomplished by the addition
4.1.14 Supplementary Requirements.
of a prefix “C” and a suffix “00.” The suffix can be used to accommodate
composition variations of the base alloy.
4.2 In addition, when a section with a title identical to that
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
referenced in 5.1 appears in this specification, it contains
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
additional requirements which supplement those appearing in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Specification B248.
*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
B768−11 (2016)
TABLE 1 Chemical Requirements
5. Ordering Information
Composition, %
5.1 Include the following information when placing orders
Element Copper Alloy UNS Number
for product under this specification, as applicable:
C17410 C17450 C17460
5.1.1 ASTM designation and year of issue,
Beryllium 0.15–0.50 0.15–0.50 0.15–0.50
5.1.2 Copper alloy UNS No. designation (1.1),
Cobalt 0.35–0.6 . .
5.1.3 Form of material: strip or sheet,
Nickel . 0.50–1.0 1.0–1.4
Iron, max 0.20 0.20 0.20
5.1.4 Temper (Section 8),
Zirconium, max . 0.50 0.50
5.1.5 Tension test, if required (Section 9),
Tin, max . 0.25 0.25
5.1.6 Dimensions: thickness and width, and length as appli-
Silicon, max 0.20 0.20 0.20
Aluminum, max 0.20 0.20 0.20
cable (Section 11),
copper remainder remainder remainder
5.1.7 How furnished: rolls, stock lengths with or without
Copper + sum of 99.5 % min 99.5 % min 99.5 % min
ends, specific lengths with or without ends (Section 11),
named elements
5.1.8 Type of edge, if required: slit, sheared, sawed, square
corners, rounded corners, rounded edges, or full rounded edges
(see 11.6),
8.1.1 Copper Alloy UNS No. C17410 Strip and Sheet is
5.1.9 Special thickness tolerances, if required (Section 11),
offered in the TH02 ( ⁄2 HT) and TH04 (HT) tempers.
5.1.10 Hardness test, if required,
8.1.2 Copper Alloy UNS No. C17450 Strip and Sheet is
5.1.11 Special marking or packaging, if required,
offered in TH02 ( ⁄2 HT) Temper.
5.1.12 Mill test report, if required,
8.1.3 Copper Alloy UNS No. C17460 Strip and Sheet is
5.1.13 Special tests or exceptions, if any, and
offered in the TH03 ( ⁄4 HT) and TH04 (HT) tempers.
5.1.14 Certification, if required.
9. Physical Properties
5.2 If product is purchased for agencies of the U.S. Gov-
9.1 Electrical Conductivity:
ernment (see the Supplementary Requirements as defined in
9.1.1 The product furnished shall conform to the electrical
the current issue of Specification B248 for additional
conductivity prescribed in Table 3.
requirements, if specified).
10. Mechanical Properties
6. Materials and Manufacture
10.1 Tensile Strength Requirements:
6.1 Materials—The material of manufacture shall be cast
10.1.1 Product under 0.075 in. (1.905 mm) in thickness
billets or slabs of one of the alloys cited in Section 1 of this
furnished under this specification shall conform to the tensile
specification. The cast material shall be of such soundness and
requirements prescribed in Table 2, when tested in accordance
purity as to be suitable for processing into the products
with Test Methods E8/E8M.
prescribed herein.
10.1.2 Tensile test specimens shall be taken so that their
6.2 Manufacture:
longitudinal axis is parallel to the direction of rolling.
6.2.1 The product shall be manufactured by such hot
10.1.3 Acceptance or rejection, under 0.075 in. (1.905 mm)
working, cold working, and annealing processes as to produce
in thickness, based upon mechanical properties shall depend
a uniform wrought structure in the finished product.
only on tensile strength
...

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: B768 − 11 B768 − 11 (Reapproved 2016)
Standard Specification for
Copper-Cobalt-Beryllium Alloy and Copper-Nickel-Beryllium
Alloy Strip and Sheet
This standard is issued under the fixed designation B768; 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 the requirements for copper-cobalt-beryllium and copper-nickel-beryllium strip and sheet of
the following alloys:
Nominal Composition, %
Copper Alloy UNS No. Beryllium Cobalt Nickel
C17410 0.3 0.5 . . .
C17450 0.3 . . . 0.8
C17460 0.3 . . . 1.2
1.2 Units—Values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are
mathematical conversions to SI units, which 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:
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 and health practices and determine the applicability of regulatory
limitations prior to use.
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 ASTM Standards:
B194 Specification for Copper-Beryllium Alloy Plate, Sheet, Strip, and Rolled Bar
B248 Specification for General Requirements for Wrought Copper and Copper-Alloy Plate, Sheet, Strip, and Rolled Bar
B601 Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
B846 Terminology for Copper and Copper Alloys
E8/E8M Test Methods for Tension Testing of Metallic Materials
E18 Test Methods for Rockwell Hardness of Metallic Materials
E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
3. Terminology
3.1 For definitions of terms related to copper and copper alloys, refer to Terminology B846.
4. General Requirements
4.1 The following sections of Specification B248 constitutes a part of this specification
4.1.1 Terminology.
This specification is under the jurisdiction of 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 Oct. 1, 2011Oct. 1, 2016. Published November 2011October 2016. Originally approved in 1987. Last previous edition approved in 20042011
as B768 – 99B768 (2004). –11. DOI: 10.1520/B0768-11.10.1520/B0768-11R16.
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 [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
B768 − 11 (2016)
4.1.2 Materials and Manufacture.
4.1.3 Workmanship, Finish, and Appearance.
4.1.4 Sampling.
4.1.5 Number of Tests and Retests.
4.1.6 Specimen Preparation.
4.1.7 Test Methods.
4.1.8 Significance of Numerical Limits.
4.1.9 Inspection.
4.1.10 Rejection and Rehearing.
4.1.11 Certification.
4.1.12 Test Report.
4.1.13 Packaging and Marking.
4.1.14 Supplementary Requirements.
4.2 In addition, when a section with a title identical to that referenced in 5.1 appears in this specification, it contains additional
requirements which supplement those appearing in Specification B248.
5. Ordering Information
5.1 Include the following information when placing orders for product under this specification, as applicable:
5.1.1 ASTM designation and year of issue,
5.1.2 Copper alloy UNS No. designation (1.1),
5.1.3 Form of material: strip or sheet,
5.1.4 Temper (Section 8),
5.1.5 Tension test, if required (Section 9),
5.1.6 Dimensions: thickness and width, and length as applicable (Section 11),
5.1.7 How furnished: rolls, stock lengths with or without ends, specific lengths with or without ends (Section 11),
5.1.8 Type of edge, if required: slit, sheared, sawed, square corners, rounded corners, rounded edges, or full rounded edges (see
11.6),
5.1.9 Special thickness tolerances, if required (Section 11),
5.1.10 Hardness test, if required,
5.1.11 Special marking or packaging, if required,
5.1.12 Mill test report, if required,
5.1.13 Special tests or exceptions, if any, and
5.1.14 Certification, if required.
5.2 If product is purchased for agencies of the U.S. Government (see the Supplementary Requirements as defined in the current
issue of Specification B248 for additional requirements, if specified).
6. Materials and Manufacture
6.1 Materials—The material of manufacture shall be cast billets or slabs of one of the alloys cited in Section 1 of this
specification. The cast material shall be of such soundness and purity as to be suitable for processing into the products prescribed
herein.
6.2 Manufacture:
6.2.1 The product shall be manufactured by such hot working, cold working, and annealing processes as to produce a uniform
wrought structure in the finished product.
6.2.2 The product shall be hot or cold worked to the finish size, and heat-treated when required, to meet the temper properties
specified.
7. Chemical Composition
7.1 The material shall conform to the chemical composition requirements in Table 1 for the copper alloy UNS No. designation
specified in the ordering information.
7.2 These composition limits do not preclude the presence of other elements. By agreement between the manufacturer and
purchaser, limits may be established and analysis required for unnamed elements.
7.3 For alloys in which copper is given as remainder, copper is the difference between the sum of all the elements analyzed and
100 %. When all the elements in Table 1 are analyzed, the sum of results shall be 99.5 % minimum.
8. Temper
8.1 The standard tempers for products described in this specification are given in Table 2.
8.1.1 Copper Alloy UNS No. C17410 Strip and Sheet is offered in the TH02 ( ⁄2 HT) and TH04 (HT) tempers.
B768 − 11 (2016)
TABLE 1 Chemical Requirements
Composition, %
Element Copper Alloy UNS Number
C17410 C17450 C17460
Beryllium 0.15–0.50 0.15–0.50 0.15–0.50
Cobalt 0.35–0.6 . .
Nickel . 0.50–1.0 1.0–1.4
Iron, max 0.20 0.20 0.20
Zirconium, max . 0.50 0.50
Tin, max . 0.25 0.25
Silicon, max 0.20 0.20 0.20
Aluminum, max 0.20 0.20 0.20
copper remainder remainder remainder
Copper + sum of 99.5 % min 99.5 % min 99.5 % min
named elements
8.1.2 Copper Alloy UNS No.
...