1、Designation: B 768 99 (Reapproved 2004)Standard Specification forCopper-Cobalt-Beryllium Alloy and Copper-Nickel-BerylliumAlloy Strip and Sheet1This standard is issued under the fixed designation B 768; the number immediately following the designation indicates the year oforiginal adoption or, in th
2、e case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 Thi
3、s specification establishes the requirements forcopper-cobalt-beryllium and copper-nickel-beryllium strip andsheet. The following alloys are covered:Nominal Composition, %Copper Alloy UNS No.2Beryllium Cobalt NickelC17410 0.3 0.5 . . .C17450 0.3 . . . 0.8C17460 0.3 . . . 1.21.2 The values stated in
4、inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.3 The following safety hazard caveat pertains only to thetest methods described in this specification:1.3.1 This standard does not purport to address all of thesafety concerns, if any, assoc
5、iated 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 documents of the issue in effect on dateof material purchase
6、 form a part of this specification to theextent referenced herein:2.2 ASTM Standards:3B 194 Specification for Copper-Beryllium Alloy Plate,Sheet, Strip and Rolled BarB 248 Specification for General Requirements for WroughtCopper and Copper-Alloy Plate, Sheet, Strip, and RolledBarB 601 Classification
7、 for Temper Designations for Copperand Copper AlloysWrought and CastB 846 Terminology for Copper and Copper AlloysE 8 Test Methods for Tension Testing of Metallic MaterialsE 255 Practice for Sampling Copper and Copper Alloys forDetermination of Chemical CompositionE 527 Practice for Numbering Metals
8、 and Alloys (UNS)3. Terminology3.1 For terms related to copper and copper alloys, refer toTerminology B 846.4. General Requirements4.1 The following sections of Specification B 248 consti-tutes a part of this specification4.1.1 Terminology.4.1.2 Materials and Manufacture.4.1.3 Workmanship, Finish, a
9、nd 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
10、.2 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 B 248.5. Ordering Information5.1 Orders for material under this specification shouldinclude the following
11、information:5.1.1 Quantity,5.1.2 Copper alloy UNS numbers (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),1This specification is under the jurisdiction of ASTM Committee B05 on Copperand Copper Alloys and is the direct responsibility
12、of Subcommittee B05.01 on Plate,Sheet, and Strip.Current edition approved May 1, 2004. Published May 2004. Originallyapproved in 1987. Last previous edition approved in 1999 as B 768 99.2The UNS system for copper and copper alloys (see Practice E 527) is a simpleexpansion of the former standard desi
13、gnation 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. For Annual Book of AST
14、MStandards 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.5.1.6 Dimensions: thickn
15、ess and width, and length as appli-cable (Section 11),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
16、),5.1.9 Special thickness tolerances, if required (Section 11),5.1.10 Specification number and year of issue,5.1.11 Hardness test, if required,5.1.12 Special marking or packaging, if required,5.1.13 Mill test report, if required,5.1.14 Special tests or exceptions, if any, and5.1.15 Certification, if
17、 required.5.2 When material is purchased for agencies of the U.S.Government, this shall be specified in the contract or purchaseorder, and the material shall conform to the SupplementaryRequirements as defined in the current issue of SpecificationB 248.6. Materials and Manufacture6.1 MaterialsThe ma
18、terial of manufacture shall be castbillets or slabs of one of the alloys cited in Section 1 of thisspecification. The cast material shall be of such soundness andpurity as to be suitable to product the product as described in6.2.6.2 Manufacture:6.2.1 The product shall be manufactured by such hot wor
19、k-ing, cold working, and annealing processes as to produce auniform wrought structure in the finished product.6.2.2 The product shall be rolled to finish size and heattreated when required to meet the temper properties.7. Chemical Composition7.1 The material shall conform to the requirements specifi
20、edin Table 1.7.2 These composition limits do not preclude the presenceof other elements. Limits may be established and analysisrequired for unnamed elements may be established by agree-ment between the manufacturer or supplier and the purchaser.7.3 For copper alloys in which copper is given as remai
21、nder,copper may be taken as the difference between the sum of allthe elements analyzed and 100 %. When all the elements in thetable are analyzed, their sum shall be 99.5 % minimum.8. Temper8.1 The product is offered in the following tempers inaccordance with Classification B 601.8.1.1 Copper Alloy U
22、NS No. C17410 Strip and Sheet isoffered in the TH02 (12 HT) and TH04 (HT) 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 Electri
23、cal ConductivityThe electrical conductivity ofthe product shall conform to the applicable requirement givenin Table 2.10. Mechanical Properties10.1 Tensile Requirements:10.1.1 Tension tests are required for material under 0.075 in.(1.905 mm) in thickness and shall conform to the mechanicalproperties
24、 in Table 3.10.1.2 Tension test specimens shall be taken so that theirlongitudinal axis is parallel to the direction of rolling.10.2 Rockwell HardnessRockwell hardness measure-ments are required for material 0.075 in. (1.905 mm) and overand shall conform to the Rockwell Hardness number in Table3.11.
25、 Dimensions and Permissible Variations11.1 The dimensions and tolerances for material covered bythis specification shall be in accordance with the current editionof Specification B 248, with particular reference to Section 5and the following tables of that specification:11.2 ThicknessSee 5.2.2, Tabl
26、e 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 5.4.1.11.4.2 Schedule of Lengths (Specific and Stock) WithEndsSee 5.4.2 and Table 8.11.5 Straightness:11.
27、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 17.11.6.4 Full-Rounded EdgesSee 5.6.4 and Table 18.TABLE 1 Chemical RequirementsElementComposition
28、, %Copper Alloy UNS NumberC17410 C17450 C17460Beryllium 0.150.50 0.150.50 0.150.50Cobalt 0.350.6Nickel 0.501.0 1.01.4Iron, max 0.20 0.20 0.20Zirconium, max 0.50 0.50Tin, max 0.25 0.25Silicon, max 0.20 0.20 0.20Aluminum, max 0.20 0.20 0.20Copper + sum ofnamed elements99.5 % min 99.5 % min 99.5 % minT
29、ABLE 2 Electrical ConductivityCopper Alloy UNS No. Temper Percent IACS, minC17410 TH02, TH04 45C17450 TH02 50C17460 TH03, TH04 50B 768 99 (2004)212. Workmanship, Finish and Appearance12.1 The product shall be free of defects, but blemishes ofa nature that do not interfere with the intended applicati
30、on areacceptable.13. Sampling13.1 SamplingThe heat, lot, portion size, and selection ofsamples should be as follows:13.1.1 HeatA heat shall be the result of castings pouredsimultaneously from the same source of molten metal.13.1.2 Lot SizeThe lot size shall be a heat or fractionthereof.13.1.3 Portio
31、n SizeSample pieces for physical and me-chanical testing shall be taken from each lot. Sample pieces forchemistry shall be in accordance with A7.1.2.1 of SpecificationB 248.14. Number of Tests and Retests14.1 The number of tests and retests shall be in accordancewith Section 8 of Specification B 248
32、.15. Specimen Preparation15.1 Chemical AnalysisSample preparation shall be inaccordance with Practice E 255.15.2 Tension TestsSample preparation shall be in accor-dance with Test Methods E 8.15.3 Rockwell HardnessThe test specimens shall be of asize and shape to permit testing by the available test
33、equipmentand shall be taken to permit testing in a plane parallel to thedirection of deformation 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 foreignma
34、tter and care shall be taken to avoid any change in condition,that is, heating or cold working.16. Test Methods16.1 The test methods for determining the mechanical andphysical properties are detailed in Specification B 248.16.2 The test method for determining chemical analysis forcompliance and prep
35、aration to certifications and test reportsshall be at the discretion of the reporting laboratory.16.2.1 In case of dispute, the test method in the Annex ofSpecification B 194 shall be used for determining chemicalrequirements in Table 1.16.3 When analysis for unnamed or residual elements isrequired
36、in the purchase order, the method of analysis shall bemutually agreed upon between the manufacturer or supplierand the purchaser.17. Keywords17.1 beryllium copper strip; copper UNS number C17410;copper UNS number C17450; copper UNS number C17460SUMMARY OF CHANGESCommittee B05 has identified the loca
37、tion of selected changes to this specification since the last issue(B 768 94).(1) This specification received an editorial five-year update.Rewording and additions were made in accordance with thenew “Outline of Form.”(2) Alloys C17450 and C17460 were added.(3) Title was changed to incorporate C1745
38、0 and C17460.TABLE 3 Mechanical Property Requirements for Strip and Sheet Precipitation Heat TreatedCopper AlloyUNS No.Temper 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
39、-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 80-100 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)B 768
40、99 (2004)3ASTM 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 riskof infringement of such r
41、ights, 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 standard or for addition
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43、TM 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).B 768 99 (2004)4
