1、Designation: B941 16Standard Specification forHeat Resistant Aluminum-Zirconium Alloy Wire for ElectricalPurposes1This standard is issued under the fixed designation B941; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、 last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 afamil
3、y of aluminum-zirconium alloys that are used for heat-resistance (that is, 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 sta
4、ted in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its us
5、e. 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 thedate of material purchase form a part
6、of this specification to theextent referenced herein.2.2 ASTM Standards:2B193 Test Method for Resistivity of Electrical ConductorMaterialsB557 Test Methods for Tension Testing Wrought and CastAluminum- and Magnesium-Alloy ProductsB830 Specification for Uniform Test Methods and Fre-quency3. Terminolo
7、gy3.1 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 sametime (Explanator
8、y 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 specimena length of wi
9、re 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 of bending test (
10、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 drawing stock.The rod sh
11、all have properties such that once drawn into wire,the wire properties set forth in Table 1 are met.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, elon
12、gation, heat resistance properties, 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 Str
13、ength and ElongationThe wire shall con-form to the tensile strength and elongation requirements setforth in Table 1 (Explanatory Note 3).1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.07 onConductors of
14、 Light Metals.Current edition approved April 1, 2016. Published May 2016. Originallyapproved in 2010. Last previous edition approved in 2010 as B941 10. DOI:10.1520/B0941-16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For
15、Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 When requested by the purchaser, tension tests shall bemade of specim
16、ens of wire containing joints made in thedrawing stock or in the wire prior to final drawing. Such testsshall 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 no
17、t less than 90 % of the values for individual testsshown in Table 1. For the smallest size group, heat resistancevalues shall not be less than 90 % of the minimum strengthspecification. (Explanatory Note 5).8. Wrap Test8.1 The wire shall be free of brittleness as evidenced by itsability to be coiled
18、 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 constitute cause for rejection.9. Resistivity9.1 Electrical resistivity, determined on samples of drawnwire selected and tested
19、in accordance with Test Method B193,shall not exceed 17.28 .cmil/ft (0.02873 .mm2/m) at 20C(68F) (Explanatory Note 4).9.2 Equivalent conductivity; the wire shall meet or exceed60.0 % IACS at 20C (68F).9.3 When resistance measurements are made at tempera-tures other than 20C (68F), corrections shall
20、be based on atemperature coefficient of resistance of 0.0040/C (0.0022/F)(see Table 2).10. Density10.1 For the purpose of calculating mass, cross-section, andso forth, the 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 wi
21、re 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 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
22、thespecified diameter by more than the values shown in Table 3.12. Joints12.1 Unless otherwise specified at the time of placing theorder, wire shall be supplied in one continuous length of reel,coil, or spool. Joints may be made in the drawing stock or wireprior to final drawing by electric-butt wel
23、ding, 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 drawing or inTABLE 1 Tensile Strength and Elongation RequirementsDiameter Tensile Strength HeatResistanceElongationin 10 in.(250 mm)i
24、n. (mm) min ksi min (MPa) (%) min (%)0.050-0.128 (1.25-3.25) 24.0 (165) 90 % ofMinimum2%0.128-0.154 (3.25-3.91) 23.5 (162) 90 % 2 %0.154-0.185 (3.91-4.70) 23.0 (159) 90 % 2 % 0.185 ( 4.70) 22.5 (155) 90 % 2 %TABLE 2 Temperature Correction Factors for ElectricalResistanceResistance Temperature (C) Mu
25、ltiplying Factor for the conversion to20C0 1.0805 1.06010 1.04015 1.02020 1.00025 0.98030 0.96035 0.94040 0.92045 0.90050 0.88055 0.86060 0.84065 0.82070 0.80075 0.78080 0.76085 0.74090 0.72095 0.700100 0.680105 0.660110 0.640115 0.620120 0.600125 0.580130 0.560135 0.540140 0.520145 0.500150 0.48015
26、5 0.460160 0.440165 0.420170 0.400175 0.380180 0.360185 0.340190 0.320195 0.300200 0.280205 0.260210 0.240215 0.220220 0.200225 0.180230 0.160235 0.140240 0.120TABLE 3 Diameter TolerancesNominal Diameter Permissible Variations in Diameter0.0105 to 0.0359 in. (up to 0.99 mm) 0.0005 in. (0.010 mm)0.03
27、60 to 0.0999 in. (1.00 to 2.99 mm) 0.0010 in. (0.030 mm)0.1000 to 0.2600 in. (3.00 mm and over) 1 % in. (1 % mm)B941 162the finished wire by electric-butt welding, cold-pressurewelding, or electric-butt, cold-upset welding, subject to thefollowing limitations.12.2.1 For wire sizes from 0.0100 to 0.0
28、555 in. 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 s
29、hall 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 dr
30、awn wireand tested to determine compliance with sections 69, 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
31、 two 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 re
32、quirements.14.3 Tensile Strength and ElongationThese may be deter-mined simultaneously. Obtain the tensile strength, in accor-dance with Test Methods B557, by dividing the maximum loadresisted by the tensile specimen by the original cross-sectionalarea of the specimen, with the tensile stress to be
33、expressed inksi MPa. Elongation is the percent increase in length of thetensile test specimen as measured between gage marks origi-nally spaced 10 in. 250 mm apart on the specimen. Elonga-tion measurements are not required for wires 0.0500 in.1.25 mm in diameter. Should any part of the fracture take
34、place outside the elongation gage lines, or if examination of thetensile specimen indicates a flaw, the values obtained may notbe representative and a test on another section of the specimenmay be run.14.4 Heat ResistanceCut wire samples from a continuoussection of drawn wire, and then heat treat te
35、st 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 B193.14.6 Test ResultsAll measured values shall
36、 meet or exceedthe 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 of it
37、s 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 helical turns for the test.15. Conformance Criteria15.1 The test results of each specimen shall meet theminimum individual
38、test requirements in Sections 69, 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 unit on ei
39、ther 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 lot shall be
40、 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 meeting the
41、 minimum property requirements of Sec-tions 69, 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 place ofmanu
42、facture 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 the manufac
43、turer andthe purchaser, conformance of the wire to the requirementsspecified in Sections 69, 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 be as agreed
44、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, reel, spool, or
45、 other package shall bear a tagshowing the manufacturers name or trademark; the productidentification as Aluminum-Zirconium heat resistant wire; theB941 163size, length, and net mass of the material. Additional informa-tion shall be as agreed upon by the manufacturer and thepurchaser at the time of
46、placing the individual orders.18. Keywords18.1 aluminum electrical conductor; aluminum heat-resistant wire; aluminum wire; aluminum-zirconium wire;electrical conductor; heat-resistant wire; wireEXPLANATORY NOTESNOTE 1A lot should comprise material taken from a product regularlymeeting the requiremen
47、ts 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 lots.NOTE 2
48、Evidence of statistical control must be demonstrated. To dothis, control charts, as described in Part 3 of ASTMSTP 15DA3may beused, or process capability indices, Cpk, as described in ASTM B830.NOTE 3The speed of testing can affect the results of the tensilestrength and elongation test. In order to
49、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 minute.NOTE 4Resistivity units are based on the International AnnealedCopper Standard (IACS) adopted by IEC in 1913, which is l/58 .mm2/mat 20C (68F) for 100 % conductivity. The value of 0.017241 .mm2/mat 20C (68F) is the inter
