ASTM B941-2005 Standard Specification for Heat Resistant Aluminum-Zirconium Alloy Wire for Electrical Purposes《电工用耐热铝锆合金丝的标准规范》.pdf

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1、Designation: B 941 05Standard Specification forHeat Resistant Aluminum-Zirconium Alloy Wire for ElectricalPurposes1This standard is issued under the fixed designation B 941; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year

2、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.1. Scope1.1 This specification covers heat resistant aluminum-zirconium alloy round wire for electrical purposes. There is afa

3、mily of aluminum-zirconium alloys that are used for heat-resistance (i.e. resist annealing), which differ by zirconiumcontent, tensile strength, electrical conductivity, and maximumuse temperature. This standard covers one currently commer-cially applicable alloy from this family.1.2 The values stat

4、ed in inch-pound units are standard. TheSI equivalents of inch-pound units may be approximate.2. Referenced Documents2.1 The following documents of the issue in effect on thedate of material purchase form a part of this specification to theextent referenced herein.2.2 ASTM Standards:2B 193 Test Meth

5、od for Resistivity of Electrical ConductorMaterialsB 557/B 557M Test Methods of Tension Testing Wroughtand Cast Aluminum- and Magnesium-Alloy ProductsB 830 Standard Specification for Uniform Testing and Fre-quency2.3 N1ST Documents:NBS Handbook 100-Copper Wire Tables3NBS Handbook 109-Aluminum Wire T

6、ables33. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 lota group of production units, up to 30 000 1b 15000 kg of mass, of one type and size of wire, which wasproduced during the same time period, under similar produc-tion conditions, and. is presented for acceptance at the sa

7、metime (Explanatory Notes 1 and 2).3.1.2 production unita coil, reel, spool, or other packageof wire that represents a single usable length.3.1.3 samplethe production unit(s) from which a testspecimen(s) has been removed, and which is considered tohave properties representative of the lot.3.1.4 spec

8、imena length of wire removed for test purposes.4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of each size,4.1.2 Wire size (see 11.1 and 11.2),4.1.3 Special tension test, if required (see 6.1, 6.2 and 7.1),4.1.4 Frequency

9、 of bending test (see 8.1 and 14.7),4.1.5 Special jointing procedures, if permitted (see 12.1),4.1.6 Place of inspection (see 16.2),4.1.7 Package size and type (see 17.1),4.1.8 Special package marking, if required (see 17.4).5. Materials and Manufacture5.1 The aluminum wire shall be made from drawin

10、g stockmeeting the requirements of Redraw Rod, as set forth in Table1.5.2 The wire shall be aluminum-zirconium alloy of suchquality and purity that the finished product shall have theproperties and characteristics prescribed in this specification,including tensile, elongation, heat resistance proper

11、ties, bend-ing properties, and electrical resistivity. Chemical analysis of aspecific alloy is not a requirement of this specification unlessdefinite agreement is reached between the manufacturer andthe purchaser on individual orders.6. Tensile Properties6.1 Tensile Strength and ElongationThe wire s

12、hall con-form to the tensile strength and elongation requirements setforth in Table 2 (Explanatory Note 3).6.2 When requested by the purchaser, tension tests shall bemade of specimens of wire containing joints made in thedrawing stock or in the wire prior to final drawing. Such tests1This specificat

13、ion is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.07 onConductors of Light Metals.Current edition approved Oct. 1, 2005. Published October 2005.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orconta

14、ct ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from National Institute of Standards and Technology (NIST),Gaithersburg, MD 20899.1Copyright ASTM International, 100 Barr Harbo

15、r Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.shall indicate tensile strengths not less than 90 % of the valuesfor individual tests shown in Section 6.1.7. Heat Resistance7.1 Heat resistance tests (see section 14.4) shall indicatestrengths not less than 90 % of the values for

16、 individual testsshown in Table 2.8. Wrap Test8.1 The wire shall be free of brittleness as evidenced by itsability to be coiled or looped at least six times around its owndiameter in a close helix, with or without a mandrel (seesection 14.7). No fracture shall occur. Slight surface checksshall not c

17、onstitute cause for rejection.9. Resistivity9.1 Electrical resistivity, determined on samples of drawnwire selected and tested in accordance with Test MethodB 193, shall not exceed 17.28 V.cmil/ft (0.02873 V.mm2/m) at20C (68F) (Explanatory Note 4).9.2 Equivalent conductivity; the wire shall meet or

18、exceed60.0 % IACS at 20C (68F).9.3 When resistance measurements are made at tempera-tures other than 20C (68F), corrections shall be based on atemperature coefficient of resistance of 0.0036/C (0.0020/F).(see Table 3)10. Density10.1 For the purpose of calculating mass, cross-section, andso forth, th

19、e density of aluminum-zirconium alloy shall betaken as 2700 kg/m30.0970 Ib/in.3 at 20C 68F.11. Diameter11.1 The diameter of the wire shall be specified in inches tothe nearest 0.0001 in. or the diameter of the wire shall bespecified in millimeters to the nearest 0.001 mm for wires lessthan 1.000 mm

20、in diameter, and to the nearest 0.01 mm forwires 1.00 mm in diameter and larger.11.2 The actual wire diameter shall not vary from thespecified diameter by more than the values shown in Table 4.12. Joints12.1 Unless otherwise specified at the time of placing theorder, wire shall be supplied in one co

21、ntinuous length of reel,coil, or spool. Joints may be made in the drawing stock or wireprior to final drawing by electric-butt welding, cold-pressurewelding, or by electric-butt, cold-upset welding.12.2 If agreed upon between the manufacturer and thepurchaser, joints may be made during the final dra

22、wing or inthe finished wire by electric-butt welding, cold-pressure weld-ing, or electric-butt, cold-upset welding, subject to the follow-ing limitations.TABLE 1 Properties of Al-Zr Redraw RodProperty ValueMin. Tensile Strength 17.4 ksi (120 MPa)Minimum Elongation 8 %Minimum Conductivity 60.5 % IACS

23、 at 20C (68F)Maximum Resistivity 17.14 V.cmil/ft (0.0285 V.mm2/m) at 20C(68F)TABLE 2 Tensile Strength and Elongation RequirementsDiameter,in. (mm)TensileStrength,min (ksi)TensileStrength,min (MPa)Elongation in 10 in.(250 mm), min (%)0.050-0.128 (1.25-3.25) 24.0 (165) 2 %0.128-0.154 (3.25-3.91) 23.5

24、(162) 2 %0.154-0.185 (3.91-4.70) 23.0 (159) 2 %TABLE 3 Temperature Correction Factors for ElectricalResistanceResistance Temperature (C) Multiplying Factor for the conversion to20C0 1.0785 1.05710 1.03715 1.01820 125 0.98230 0.96535 0.94940 0.93345 0.91750 0.90355 0.88860 0.87465 0.86170 0.84775 0.8

25、3580 0.82285 0.8190 0.79995 0.787100 0.776105 0.766110 0.755115 0.745120 0.735125 0.726130 0.716135 0.707140 0.698145 0.690150 0.681155 0.673160 0.665165 0.657170 0.649175 0.642180 0.635185 0.627190 0.620195 0.613200 0.607205 0.600210 0.594215 0.588220 0.581225 0.575230 0.569235 0.564240 0.558TABLE

26、4 Diameter TolerancesNominal Diameter Permissible Variations in Diameter0.0105 to 0.0359 in. (up to 0.99 mm) 60.0005 in. (60.010 mm)0.0360 to 0.0999 in. (1.00 to 2.99 mm) 60.0010 in. (60.030 mm)0.1000 to 0.2600 in. (3.00 mm and over) 6l%in.(6l %mm)B94105212.2.1 For wire sizes from 0.0100 to 0.0555 i

27、n. 0.225 to1.25 mm in diameter not more than three such joints shall bepresent in any coil, reel, or spool of the specified nominal mass.12.2.2 For wire sizes greater than 0.0500 in. 1.25 mmdiameter, not more than 10 % of the coils, reels, or spools shallcontain such joints, and no such joint shall

28、be closer than 50 ft15 m to another joint or to either end of the wire. Not morethan two such joints shall be present in any coil, reel or spoolof the specified nominal mass.13. Sampling13.1 SamplingFor each use of a coil of redraw rod, fourtest specimens shall be obtained from the resulting drawn w

29、ireand tested to determine compliance with sections 6-9, and 11.14. Test Methods14.1 DiameterDimensional measurements shall be madewith equipment capable of measuring to a graduation of 0.0001in. or 0.001 mm. Take two measurements at one location, thesecond rotated 90 from the first. Average the two

30、 measure-ments to obtain the specimen diameter.14.2 FinishMake a visual surface finish inspection withthe unaided eye (corrective lenses excepted). The surface finishshall be free of surface marks. Should any specimen be foundunacceptable, the lot shall be considered to not meet surfacefinish requir

31、ements.14.3 Tensile strength and elongationThese may be deter-mined simultaneously. Obtain the tensile strength, in accor-dance with Test Methods B 557/B 557M, by dividing themaximum load resisted by the tensile specimen by the originalcross-sectional area of the specimen, with the tensile stress to

32、be expressed in ksi MPa. Elongation is the percent increase inlength of the tensile test specimen as measured between gagemarks originally spaced 10 in. 250 mm apart on the speci-men. Elongation measurements are not required for wires0.0500 in. 1.25 mm in diameter. Should any part of thefracture tak

33、e place outside the elongation gage lines, or ifexamination of the tensile specimen indicates a flaw, the valuesobtained may not be representative and a test on anothersection of the specimen may be run.14.4 Heat ResistanceCut wire samples from a continuoussection of drawn wire, and then heat treat

34、test samples in auniformly heated oven or furnace at 536 6 9F (280 6 5C)for one hour, remove and air cool, and then measure the tensilestrength at room temperature as in Section 14.3.14.5 Determine the electrical resistivity in accordance withTest Method B 193.14.6 Test ResultsAll measured values sh

35、all meet or ex-ceed the minimum sample requirements.14.7 Wrap test (Brittleness)Specimens from any produc-tion unit may be tested, with the frequency of sampling andtesting to be agreed upon by the manufacturer and thepurchaser. Slowly wrap the test specimen in an open helixaround a wire or mandrel

36、of its own diameter. Take care not tostretch the specimen during the wrapping operation. Thespacing of consecutive turns shall be approximately equal tothe diameter of the wire. Use six helical turns for the test.15. Conformance Criteria15.1 The test results of each specimen shall meet theminimum in

37、dividual test requirements in Sections 6-9, 11,unless otherwise specified.15.2 If one or more of the test samples fail any test, thenon-conforming production unit will be rejected. Additionaltests shall be required as follows:15.2.1 One additional test specimen shall be obtained fromeach production

38、unit on either side of the non-conformingproduction unit. Tests shall be run on the additional units.15.2.2 If all of the additional individual specimen results arein conformance, the lot shall be considered in conformance.15.2.3 If one or more of the additional tested specimens failany test, the lo

39、t shall be considered not in conformance andrejected.15.2.4 In the event a lot is rejected in accordance with15.2.3, production units making up that lot may be individuallytested. Acceptance of individual production units from arejected lot shall be dependent on the individual specimen testresults m

40、eeting the minimum property requirements of Sec-tions 6-9, and 11.16. Inspection16.1 Unless otherwise specified in the purchase contract, themanufacturer shall be responsible for the performance of allinspection and testing requirements specified.16.2 All tests and inspections shall be made at the p

41、lace ofmanufacture unless otherwise agreed upon by the manufacturerand the purchaser.16.3 The manufacturer shall afford the purchaser reasonableaccess to the manufacturers facilities consistent with thepurchasers need to ensure compliance with this specification.16.4 Unless otherwise agreed upon by

42、the manufacturer andthe purchaser, conformance of the wire to the requirementsspecified in Sections 6-9, and 11, shall be determined bysampling in accordance with Sections 14, 15, and 16 of each lotof wire presented for acceptance.17. Packaging and Package Marking17.1 Package sizes and types shall b

43、e as agreed upon by themanufacturer and the purchaser at the time of placing theindividual orders.17.2 Unless otherwise specified, each coil, reel, or spoolshall contain one continuous length of wire.17.3 The wire shall be protected against damage in ordinaryhandling and shipping.17.4 Each coil, ree

44、l, spool, or other package shall bear a tagshowing the manufacturers name or trademark; the productidentification as Aluminum-Zirconium heat resistant wire; thesize, length, and net mass of the material. Additional informa-tion shall be as agreed upon by the manufacturer and thepurchaser at the time

45、 of placing the individual orders.18. Keywords18.1 aluminum electrical conductor; aluminum wire; elec-trical conductor; wire; heat-resistant wire; aluminum-zirconium wire; aluminum heat-resistant wireB941053EXPLANATORY NOTESNOTE 1Alot should comprise material taken from a product regularlymeeting th

46、e requirements of this specification. Inspection of lots of lessthan 5000 lb 2500 kg of wire cannot be justified economically. For smalllots of less than 5000 lb 2500 kg the purchaser may agree to themanufacturers regular inspection of the product as a whole as evidence ofacceptability of such small

47、 lots.NOTE 2Evidence of statistical control must be demonstrated. To dothis, control charts, as described in Part 3 of ASTMSTP 15DA4may beused, or process capability indices, Cpk, as described in ASTM B 830.NOTE 3The speed of testing can affect the results of the tensilestrength and elongation test.

48、 In order to ensure uniformity in the testmethod and valid applicability of the test results to the conformancecriteria, it is recommended that the rate of separation of the heads of thetensile test machine not exceed 0.5 in. for each inch or 0.5 mm for eachmillimeter of length between grips per min

49、ute.NOTE 4Resistivity units are based on the International AnnealedCopper Standard (IACS) adopted by IEC in 1913, which is l/58 V.mm2/mat 20C (68F) for 100 % conductivity. The value of 0.017241 V.mm2/mat 20C (68F) is the international equivalent of volume resistivity ofannealed copper equal to 100 % conductivity. A complete discussion ofthis subject is contained in NBS Handbook 100. The use of five significantfigures in expressing resistivity does not imply the need for greateraccuracy of measurement than that specified