1、Designation: B768 11Standard Specification forCopper-Cobalt-Beryllium Alloy and Copper-Nickel-BerylliumAlloy Strip and Sheet1This standard is issued under the fixed designation B768; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification estab
3、lishes the requirements forcopper-cobalt-beryllium and copper-nickel-beryllium strip andsheet of the following alloys:Nominal Composition, %Copper Alloy UNS No.2Beryllium Cobalt NickelC17410 0.3 0.5 . . .C17450 0.3 . . . 0.8C17460 0.3 . . . 1.21.2 UnitsValues stated in inch-pound units are to berega
4、rded as the standard. The values given in parentheses aremathematical conversions to SI units, which are provided forinformation only and are not considered standard.1.3 The following safety hazard caveat pertains only to thetest methods described in this specification:1.3.1 This standard does not p
5、urport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 The following do
6、cuments of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:3B194 Specification for Copper-Beryllium Alloy Plate,Sheet, Strip, and Rolled BarB248 Specification for General Requirements for WroughtCopper and Copper-All
7、oy Plate, Sheet, Strip, and RolledBarB601 Classification for Temper Designations for Copperand Copper AlloysWrought and CastB846 Terminology for Copper and Copper AlloysE8/E8M Test Methods for Tension Testing of MetallicMaterialsE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE255 Pract
8、ice for Sampling Copper and Copper Alloys forthe Determination of Chemical CompositionE527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)3. Terminology3.1 For definitions of terms related to copper and copperalloys, refer to Terminology B846.4. General Requirements4.1
9、The following sections of Specification B248 constitutesa part of this specification4.1.1 Terminology.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 Numeric
10、al 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.1This specification is under the jurisdiction ofASTM Committee B05 on Copperand CopperAlloys and is the direct responsibility of Subcommitt
11、ee B05.01 on Plate,Sheet, and Strip.Current edition approved Oct. 1, 2011. Published November 2011. Originallyapproved in 1987. Last previous edition approved in 2004 as B768 99 (2004).DOI: 10.1520/B0768-11.2The UNS system for copper and copper alloys (see Practice E527) is a simpleexpansion of the
12、former standard designation system accomplished by the additionof a prefix “C” and a suffix “00.” The suffix can be used to accommodatecomposition variations of the base alloy.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. Fo
13、r Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*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.4.2
14、In addition, when a section with a title identical to thatreferenced in 5.1 appears in this specification, it containsadditional requirements which supplement those appearing inSpecification B248.5. Ordering Information5.1 Include the following information when placing ordersfor product under this s
15、pecification, 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 appli-cable (Section 11),
16、5.1.7 How furnished: rolls, stock lengths with or withoutends, specific lengths with or without ends (Section 11),5.1.8 Type of edge, if required: slit, sheared, sawed, squarecorners, rounded corners, rounded edges, or full rounded edges(see 11.6),5.1.9 Special thickness tolerances, if required (Sec
17、tion 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, and5.1.14 Certification, if required.5.2 If product is purchased for agencies of the U.S. Gov-ernment (see the Supplementary Re
18、quirements as defined inthe current issue of Specification B248 for additional require-ments, if specified).6. Materials and Manufacture6.1 MaterialsThe material of manufacture shall be castbillets or slabs of one of the alloys cited in Section 1 of thisspecification. The cast material shall be of s
19、uch soundness andpurity as to be suitable for processing into the productsprescribed herein.6.2 Manufacture:6.2.1 The product shall be manufactured by such hot work-ing, cold working, and annealing processes as to produce auniform wrought structure in the finished product.6.2.2 The product shall be
20、hot or cold worked to the finishsize, and heat-treated when required, to meet the temperproperties specified.7. Chemical Composition7.1 The material shall conform to the chemical compositionrequirements in Table 1 for the copper alloy UNS No.designation specified in the ordering information.7.2 Thes
21、e composition limits do not preclude the presenceof other elements. By agreement between the manufacturer andpurchaser, limits may be established and analysis required forunnamed elements.7.3 For alloys in which copper is given as remainder, copperis the difference between the sum of all the element
22、s analyzedand 100 %. When all the elements in Table 1 are analyzed, thesum of results shall be 99.5 % minimum.8. Temper8.1 The standard tempers for products described in thisspecification are given in Table 2.8.1.1 Copper Alloy UNS No. C17410 Strip and Sheet isoffered in the TH02 (12 HT) and TH04 (H
23、T) tempers.8.1.2 Copper Alloy UNS No. C17450 Strip and Sheet isoffered in TH02 (12 HT) Temper.8.1.3 Copper Alloy UNS No. C17460 Strip and Sheet isoffered in the TH03 (34 HT) and TH04 (HT) tempers.9. Physical Properties9.1 Electrical Conductivity:9.1.1 The product furnished shall conform to the elect
24、ricalconductivity prescribed in Table 3.10. Mechanical Properties10.1 Tensile Strength Requirements:TABLE 1 Chemical RequirementsElementComposition, %Copper Alloy UNS NumberC17410 C17450 C17460Beryllium 0.150.50 0.150.50 0.150.50Cobalt 0.350.6 . .Nickel . 0.501.0 1.01.4Iron, max 0.20 0.20 0.20Zircon
25、ium, max . 0.50 0.50Tin, max . 0.25 0.25Silicon, max 0.20 0.20 0.20Aluminum, max 0.20 0.20 0.20copper remainder remainder remainderCopper + sum ofnamed elements99.5 % min 99.5 % min 99.5 % minTABLE 2 Mechanical Property Requirements for Strip and Sheet Precipitation Heat TreatedCopper AlloyUNS No.Te
26、mper Designation Tensile Strength, ksi(MPA)Yield Strength, ksi (MPA),0.2 % offsetElongation, 2 in. (50mm), %Rockwell HardnessStandard Former B 30TC17410 TH0212 HT 95-115 80-100 10-20 89-98 76-81(655-790) (550-690)TH04 HT 110-130 100-120 7-17 95-100 79-86(760-895) (690-830)C17450 TH0212 HT 95-115 80-
27、100 12 min 88-99 75-82(655-790) (550-690)C17460 TH0334 HT 115-135 95-115 11 min 98-105 81-88(790-930) (655-790)TH04 HT 120-140 105-125 10 min 99-106 82-89(825-965) (720-860)B768 11210.1.1 Product under .075 in. (1.905 mm) in thicknessfurnished under this specification shall conform to the tensilereq
28、uirements prescribed in Table 2, when tested in accordancewith Test Method E8/E8M.10.1.2 Tensile test specimens shall be taken so that theirlongitudinal axis is parallel to the direction of rolling.10.1.3 Acceptance or rejection, under .075 in. (1.905 mm)in thickness, based upon mechanical propertie
29、s shall dependonly on tensile strength.10.2 Rockwell Hardness Requirements:10.2.1 Product .075 in. (1.905 mm) and over in thicknessfurnished under this specification shall conform to the Rock-well hardness requirements prescribed in Table 2, when testedin accordance with Test Method E18.10.2.2 Accep
30、tance or rejection, .075 in. (1.905 mm) andover in thickness, based upon mechanical properties shalldepend only on Rockwell hardness.11. Dimensions and Permissible Variations11.1 The dimensions and tolerances for product describedby this specification shall be as specified in Specification B248,with
31、 particular reference to the following tables and relatedparagraphs:11.2 ThicknessSee 5.2.2, Table 2, and for special toler-ances, Table 3.11.3 Width:11.3.1 Slit Metal and Slit Metal With Rolled EdgesSee5.3.1 and Table 4.11.4 Length:11.4.1 Specific and Stock Lengths With and Without EndsSee 5.4.1.11
32、.4.2 Schedule of Lengths (Specific and Stock) WithEndsSee 5.4.2 and Table 8.11.5 Straightness:11.5.1 Slit Metal or Edge-Rolled MetalSee 5.5.1 andTable 11.11.6 EdgesSee 5.6.11.6.1 Square EdgesSee 5.6.1 and Table 15.11.6.2 Rounded CornersSee 5.6.2 and Table 16.11.6.3 Rounded EdgesSee 5.6.3 and Table 1
33、7.11.6.4 Full-Rounded EdgesSee 5.6.4 and Table 18.12. Workmanship, Finish and Appearance12.1 The product shall be free of defects, but blemishes ofa nature that do not interfere with the intended application areacceptable.13. Sampling13.1 SamplingThe lot size, portion size, and selection ofsamples p
34、ieces shall be as follows:13.1.1 Lot SizeAn inspection lot shall be 10 000 lbs. orless material of the same mill form, alloy, temper, and nominaldimensions, subject to inspection at one time or shall be theproduct of one cast bar from a single melt charge, whoseweight shall not exceed 25 000 lbs. th
35、at has been continuouslyprocessed and subject to inspection at one time.13.1.2 Portion SizeA portion shall be two representativesamples taken from the product of one cast bar that has beencontinually processed to the finished temper and dimensions.13.1.3 Chemical Analysissample pieces for chemicalan
36、alysis shall be in accordance with section 7.1.2.1 of Speci-fication B248.14. Number of Tests and Retests14.1 The number of tests and retests shall be in accordancewith Section 8 of Specification B248.15. Specimen Preparation15.1 Chemical AnalysisSample preparation shall be inaccordance with Practic
37、e E255.15.2 Tensile TestsSample preparation shall be in accor-dance with Section 9 of Specification B248.15.3 Rockwell HardnessThe test specimens shall be of asize and shape to permit testing by the available test equipmentand shall be taken to permit testing in a plane parallel to thedirection of d
38、eformation given to the product.15.3.1 The surface of the test specimens shall be sufficientlysmooth and even to permit the accurate determination ofhardness.15.3.2 The specimen shall be free of scale and foreignmatter and care shall be taken to avoid any change in condition,that is, heating or cold
39、 working.16. Test Methods16.1 The test methods for determining the mechanical andphysical properties are detailed in Specification B248.16.2 The test method for determining chemical analysis forcompliance and preparation to certifications and test reportsshall be at the discretion of the reporting l
40、aboratory.16.2.1 In case of dispute, the test method in the Annex ofSpecification B194 shall be used for determining chemicalrequirements in Table 1.16.3 When analysis for unnamed or residual elements isrequired in the purchase order, the method of analysis shall bemutually agreed upon between the m
41、anufacturer or supplierand the purchaser.17. Keywords17.1 beryllium copper strip; copper UNS number C17410;copper UNS number C17450; copper UNS number C17460TABLE 3 Electrical ConductivityCopper Alloy UNS No. Temper Percent IACS, minC17410 TH02, TH04 45C17450 TH02 50C17460 TH03, TH04 50B768 113SUMMA
42、RY OF CHANGESCommittee B05 has identified the principal changes to this specification that have been incorporated since the1999 (2004) issue as follows:(1) This specification received an editorial five-year update.Rewording and additions were made in accordance with thenew “Outline of Form.”(2) Copp
43、er remainder was added to Table 1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risko
44、f infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this
45、standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake yo
46、ur views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).B768 114
