ASTM B937-18

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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: B937 − 15 B937 − 18
Standard Specification for
Copper-Beryllium Seamless Tube (UNS Nos. C17500 and
C17510)
This standard is issued under the fixed designation B937; 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 seamless tube in straight lengths. Copper-cobalt-
beryllium alloy UNS No. C17500 and copper-nickel-beryllium alloy UNS No. C17510 will be the alloys furnished whenever this
specification is specified.
1.2 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. 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 to 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 ASTM Standards:
B193 Test Method for Resistivity of Electrical Conductor Materials
B194 Specification for Copper-Beryllium Alloy Plate, Sheet, Strip, and Rolled Bar
B251B251/B251M Specification for General Requirements for Wrought Seamless Copper and Copper-Alloy Tube (Metric)
B0251_B0251M
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
E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition
E1004 Test Method for Determining Electrical Conductivity Using the Electromagnetic (Eddy Current) Method
3. General Requirements
3.1 The following sections of Specification B251B251/B251M (as noted) constitute a part of this specification:
3.1.1 Terminology,
3.1.2 Test Specimens,
3.1.3 Significance of Numerical Limits,
3.1.4 Inspection,
3.1.5 Rejection and Rehearing,
This specification is under the jurisdiction of ASTM Committee B05 on Copper and Copper Alloys and is the direct responsibility of Subcommittee B05.04 on Pipe and
Tube.
Current edition approved May 1, 2015March 1, 2018. Published May 2015March 2018. Originally approved in 2004. Last previous edition approved in 20102015 as B937
– 04 (2010). 15. DOI: 10.1520/B0937-15.10.1520/B0937-18.
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
B937 − 18
3.1.6 Certification,
3.1.7 Packaging and Package Marking, and
3.1.8 Mill Test Report.
4. Terminology
4.1 For definitions of terms related to copper and copper alloys, refer to Terminology B846.
4.2 Definitions of Terms Specific to This Standard:
4.2.1 average diameter (for round tubes only), n—the average of the maximum and minimum outside diameters, or maximum
and minimum inside diameters, whichever is applicable, as determined at any one cross section of the tube.
4.2.2 lengths, n—straight pieces of the product
4.2.2.1 ends, n—straight pieces, shorter than the nominal length, left over after cutting the product into mill lengths, stock
lengths, or specific lengths. They are subject to minimum length and maximum weight requirements.
4.2.2.2 specific, adj—straight lengths that are uniform in length, as specified, and subject to established length tolerances.
4.2.2.3 specific with ends, adj—specific lengths, including ends.
4.2.2.4 stock, n—straight lengths that are mill cut and stored in advance of orders. They are usually 8, 10, 12, or 20 ft (2.44,
3.05, 3.66, or 6.10 m) and subject to established length tolerances.
4.2.2.5 stock with ends, adj—stock lengths, including ends.
4.2.3 tube, n—a hollow product of round or any other cross section having a continuous periphery.
4.2.3.1 tube, seamless, adj—a tube produced with a continuous periphery in all stages of the operations.
5. Ordering Information
5.1 Include the following information in orders for product under this specification, as applicable:
5.1.1 ASTM designation and year of issue,
5.1.2 Copper Alloy UNS designation (1.1),
5.1.3 Temper (see Section 8),
5.1.4 Quantity, pounds or number of pieces,
5.1.5 Dimensions, including length if applicable. For tube or pipe specify either OD/ID, OD/wall, or ID/wall,
5.1.6 How furnished: stock lengths with or without ends, specific lengths with or without ends,
5.1.7 When product is purchased for ASME Boiler and Pressure Vessel Code Application, and
5.1.8 When product is purchased for agencies of the U.S. government,
5.1.9 Special tests or exceptions, if any,
5.1.10 Tensile strength test, if required,
5.1.11 Special marking or packaging, if required,
5.1.12 Inspection, if required (see Specification B251B251/B251M),
5.1.13 Certification (see Specification B251B251/B251M),
5.1.14 Mill test report, if required (see Specification B251B251/B251M).
5.2 When material is purchased for agencies of the U.S. government, the material shall conform to the Supplementary
Requirements as defined in the current issue of Specification B251B251/B251M.
6. Materials and Manufacture
6.1 Materials:
6.1.1 The material of manufacture shall be UNS Alloy No. C17500 or C17510, cast and worked into tubular form, and of such
purity and soundness as to be suitable for processing into the products prescribed herein.
6.1.2 The tube shall have heat traceable identity.
6.2 Manufacture:
6.2.1 The product shall be manufactured by a combination of hot working or cold working, or both; annealing; or precipitation
heat treatment, or both, as to produce a uniform wrought structure in the finished product, to meet the temper specified.
7. Chemical Composition
7.1 The material shall conform to the chemical composition requirements in Table 1 for the copper alloy designated 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 listed as “Remainder,” copper is the difference between the sum of results of all elements
determined and 100 %. When all elements in Table 1 are determined, the sum of results shall be 99.5 % min.
B937 − 18
TABLE 1 Chemical Composition
Concentration, %
Copper Alloy Copper Alloy
Element UNS No. UNS No.
C17500 C17510
Beryllium 0.4-0.7 0.2-0.6
Cobalt 2.4-2.7 0.3 max
Nickel { 1.4-2.2
Iron, max 0.10 0.10
Aluminum, max 0.20 0.20
Silicon, max 0.20 0.20
Copper Remainder Remainder
8. Temper
8.1 Tempers, as described in Classification B601, available under this specification are: TB00 (solution treated (A)), TF00
(precipitation hardened (AT)), TD04 (solution heat-treated and cold worked: hard (H)), and TH04 (hard and precipitation
heat-treated (HT)). These products meet property requirements in Table 2.
9. Precipitation Heat Treatment
9.1 When material is purchased in the TB00 (A) or the TD04 (H) tempers, the precipitation heat treatment is performed by the
purchaser.
9.2 Conformance to the TF00 (AT) and TH04 (HT) specification limits shown in Table 2, for products supplied in the TB00 (A)
or the TD04 (H) tempers, shall be determined by testing specimens heat-treated at a uniform temperature of 850 to 900°F900 °F
for the times shown in Table 3.
9.3 End products may be heat-treated at other times and temperatures for specific applications. These special combinations of
properties such as increased ductility, dimensional accuracy, and endurance strength may be obtained by special precipitation-
hardening heat treatments. The mechanical requirements of Table 2 do not apply to such special heat treatment. Specific test
requirements as needed shall be agreed upon between the manufacturer or the supplier and the purchaser of the end product.
9.4 TF00 (AT) and TH04 (HT) tempers as standard mill-hardened products has been precipitation heat-treated and tested by the
manufacturer. An appropriate time and temperature has been used to produce properties within the specification limits shown in
Table 2. Table 3 does not apply. Further thermal treatment of these tempers is not normally required.
10. Physical Property Requirements
10.1 Electrical Conductivity—Product furnished to this specification shall conform to the electrical conductivity requirement
given in Table 2 for the applicable temper, when tested in accordance with Test Method E1004 or by converting from resistivity
measured in accordance with Test Method B193.
11. Mechanical Property Requirements
11.1 Mechanical property requirements are specified in Table 2.
11.2 Rockwell Hardness—Acceptance or rejection based on mechanical properties shall depend only on Rockwell hardness.
11.2.1 The referee product rejection criteria shall be tensile results, when tested in accordance with Test Methods E8/E8M.
11.3 Tension Test—The tension test will be used for qualification of all material when specifically required by the purchaser, as
in some government requirements.
A
TABLE 2 Tensile Strength and Rockwell Hardness Requirements
Temper Designation As Supplied
Yield
Tensile Rockwell Electrical
Strength Elongation
Standard Former Strength Hardness, Conductivity
ksi (MPa) min, %
B C
ksi (MPa ) B Scale IACS min, %
min
TB00 A 35-55 (240-380) 50 max 20
TD04 H 65-80 (450-550) 60-80 20
After Precipitation Heat Treatment
D
TF00 AT 100-130 (690-895) 80 (550) 92-100 10 45
D
TH04 HT 110-140 (760-965) 95-102 48
A
These values apply to mill products. See Section 11 for exceptions in end products.
B
ksi = 1000 psi.
C
See Appendix.
D
The upper limits in the tensile strength column are for design guidance only.
B937 − 18
TABLE 3 Precipitation Heat-Treatment
...