ASTM B870-21

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: B870 − 08 (Reapproved 2014) B870 − 21
Standard Specification for
Copper-Beryllium Alloy Forgings and Extrusions Alloys
(UNS Nos. C17500 C17500, C17510, and C17510)C17540)
This standard is issued under the fixed designation B870; 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.
1. Scope*
1.1 This specification establishes the requirements for copper-beryllium alloy forgings and extrusions. The following alloys are
specified:
Copper Alloy Nominal Composition, %
UNS No. Beryllium Cobalt Nickel
C17500 0.50 2.6 .
C17510 0.40 . 1.8
C17540 0.50 1.5 1.5
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 to Sections 10 and 11 of 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 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 ASTM Standards:
B194 Specification for Copper-Beryllium Alloy Plate, Sheet, Strip, and Rolled Bar
B249/B249M Specification for General Requirements for Wrought Copper and Copper-Alloy Rod, Bar, Shapes and Forgings
B441 Specification for Copper-Cobalt-Beryllium, Copper-Nickel-Beryllium, and Copper-Nickel-Lead-Beryllium Rod and Bar
(UNS Nos. C17500, C17510, and C17465)
B601 Classification for Temper Designations for Copper and Copper Alloys—Wrought and Cast
B846 Terminology for Copper and Copper Alloys
B950 Guide for Editorial Procedures and Form of Product Specifications for Copper and Copper Alloys
E8/E8M Test Methods for Tension Testing of Metallic Materials
This specification is under the jurisdiction of ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.02 on Rod, Bar,
Wire, Shapes and Forgings.
Current edition approved April 1, 2014Oct. 1, 2021. Published May 2014November 2021. Originally approved in 1996. Last previous edition approved in 20082014 as
B870 - 08. DOI: 10.1520/B0870-08R14.– 08 (2014). DOI: 10.1520/B0870-21.
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
B870 − 21
E18 Test Methods for Rockwell Hardness of Metallic Materials
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
E1004 Test Method for Determining Electrical Conductivity Using the Electromagnetic (Eddy Current) Method
3. General Requirements
3.1 The following sections of Specification B249/B249M form a part of this specification:
3.1.1 Terminology,
3.1.2 Material and Manufacture,
3.1.3 Sampling,
3.1.4 Number of Tests and Retests,
3.1.5 Specimen Preparation,
3.1.6 Significance of Numerical Limits,
3.1.7 Inspection,
3.1.8 Rejection and Rehearing,
3.1.9 Certification,
3.1.10 Test Reports, and
3.1.11 Packaging and Package Marking.
3.2 In addition, when a section with a title identical to that referenced in 3.1, above, appears in this specification, it contains
additional requirements that supplement those appearing in Specification B249/B249M.
4. Terminology
4.1 For definitions of terms related to copper and copper alloys, see Terminology B846.
4.2 Definitions of Terms Specific to This Standard:
4.2.1 extrusion, n—a uniform metal shape, long in relation to its cross-sectional dimensions, produced by forcing a suitably
preheated billet or pre-formed shape through an orifice (die) of the desired cross section.
4.2.1 forging, n—a metal part worked to a predetermined shape by one or more such processes as hammering, upsetting, pressing,
rolling, and so forth.
NOTE 1—Forged and extruded shapes in the context of this specification are generally construed to be large section products; large-section products that
are round, oval, half round, geometric custom-ordered cross-sections, and asymmetrical metal shapes. This is to generally differentiate products supplied
according to this documentin accordance with this specification as opposed to forged and extruded “Rod and Bar” in Specification B441.
5. Ordering Information
5.1 Include the following information specified choices when placing orders for product under this specification, as applicable:
5.1.1 ASTM designation and year of issue,issue;
5.1.2 Copper Alloy UNS No. (Section 1),);
5.1.3 Temper (Section 8) or condition (Section 11),);
B870 − 21
5.1.4 Drawing, when required, andDimensions, including thickness, width, length, and edges for flat products or diameter,
distance between flat surfaces, and edges for round products. Dimensions may be specified on a drawing;
5.1.5 Dimensional tolerances shall be as agreed upon between the manufacturer or supplier and purchaser; and
5.1.6 Quantity: number of pieces or pounds.
5.2 The following requirements are optional under this specification and shall be included in the contract or purchase order, when
specified.options are available and, when required, shall be specified at the time of placing the order:
5.2.1 Tension tests test or hardness (Section 10),
5.2.2 Special marking or packaging (Specification packaging,B249/B249M),
5.2.3 Inspection (Specification Report,B249/B249M),
5.2.4 Certification (Specification Certification,B249/B249M),
5.2.5 Mill test report (Specification Test report,B249/B249M),
5.2.6 Finish (Section 1314),), and
5.2.7 When materialIf product is purchased for agencies of the U.S. government, this shall be specified in the contract or purchase
order, and the material shall conform to the supplementary requirements as defined in the current issueedition of Specification
B249/B249M.
6. Materials and Manufacture
6.1 Materials:
6.1.1 The material of manufacture shouldshall be a cast billet conforming to the chemical composition requirements for the alloy
specified in the ordering information and shall be of such purity and soundness as to be suitable for processing into the product
prescribed herein.
6.2 Manufacture:
6.2.1 The product shall be manufactured by hot workingforging or extrusion, solution heat-treating, precipitation hardening, and
straightening as may be necessary to meet the properties specified.
7. Chemical Composition
7.1 The material shall conform to the chemical composition requirements in Table 1 for the alloy specified.copper alloy UNS No.
specified in the ordering information.
TABLE 1 Chemical Requirements
Concentration,Composition, %
Element
Copper Alloy UNS Copper Alloy UNS Copper Alloy UNS
No. C17500 No. C17510 No. C17540
Beryllium 0.4–0.7 0.2–0.6 0.4–0.7
Cobalt 2.4–2.7 0.3 max 0.8–1.3
Nickel . 1.4–2.2 0.8–1.3
Iron, max 0.10 0.10 0.20
Aluminum, max 0.20 0.20 .
Silicon, max 0.20 0.20 0.20
Copper Remainder Remainder Remainder
...