1、Designation: B 502 02 (Reapproved 2007)Standard Specification forAluminum-Clad Steel Core Wire for Aluminum Conductors,Aluminum-Clad Steel Reinforced1This standard is issued under the fixed designation B 502; the number immediately following the designation indicates the year oforiginal adoption or,
2、 in the 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.1. Scope1.1 This specification covers round, aluminum-clad steelcore wire used for mechanic
3、al reinforcement in the manufac-ture of aluminum conductors, aluminum-clad steel reinforced.1.2 The values stated in inch-pound or SI units are to beregarded separately as the standard. Each system shall be usedindependently of the other. Combining values from the twosystems may result in nonconform
4、ance with the specification.For conductor sizes designated byAWG, the requirements in SIunits have been numerically converted from correspondingvalues stated or derived in inch-pound units. For conductorsizes designated by SI units only, the requirements are stated orderived in SI units.2. Reference
5、d Documents2.1 The following documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein.2.2 ASTM Standards:2B 193 Test Method for Resistivity of Electrical ConductorMaterialsE8 Test Methods for Tension Testing of Metallic Materials3.
6、 Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size,3.1.2 Wire size: diameter in inches (see 6.1)3.1.3 Package size: (see 17.1),3.1.4 Special packaging and package marking if required(see 16.1), and3.1.5 Place of in
7、spection if other than place of manufacture(see 14.1).4. Materials and Manufacture4.1 The base metal shall be steel produced by the open-hearth, electric-furnace, or basic-oxygen process and shall beof such composition that the finished clad wire shall have theproperties and characteristics prescrib
8、ed in this specification.4.2 The aluminum used for cladding shall have a purity andquantity sufficient to meet thickness and resistance require-ments of this specification (see 7.1 and 9.1).5. Tensile Properties5.1 RequirementsThe aluminum-clad steel core wire shallconform to the tensile requirement
9、s prescribed in Table 1.Incomputing stress at 1 % extension and ultimate tensile strength,the actual diameter of the finished wire shall be used.5.2 Elongation TestThe elongation shall be determined byan extensometer suitable for measuring elongation in 10.0 in.(250 mm) and equipped with a vernier o
10、r other instrumentreading to 0.001 in. (0.025 mm). It shall be attached to the testspecimen at a load equal to the initial tensile stress shown inTable 2. At this load the extensometer shall be adjusted to theinitial setting shown in Table 2. Upon application of furtherload, the tension shall be rea
11、d at an extensometer reading of1.0 % to determine conformance with the requirement in Table1. Further elongation shall be observed while applying atension load to the specimen. The elongation thus determinedshall be not less than 1.5 % in 10.0 in. (250 mm). A test inwhich the extensometer reading is
12、 less than 1.5 % shall bedisregarded if the fracture occurs less than 1.0 in. (25 mm)from either attachment. In this case, another specimen from thesame reel or coil shall be tested.5.3 The tension tests shall be made in accordance with TestMethods E8. The method for determining elongation is de-scr
13、ibed in the Procedures Section of Test Methods E8.1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.06 onComposite Conductors.Current edition approved Oct. 1, 2007. Published October 2007. Originallyapprov
14、ed in 1970. Last previous edition approved in 2002 as B 502 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM websit
15、e.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Dimensions and Permissible Variations6.1 The size shall be expressed by the wire diameter indecimals of an inch to the nearest 0.0001 in. (0.003 mm).6.2 Within the range of diamete
16、rs included in Table 3 thewire shall not vary from the nominal diameter by more than theamounts shown in this table. In computing permissible varia-tions, diameters shall be rounded to the nearest 0.0001 in.(0.003 mm).6.3 If accessible, one measurement shall be taken near eachend and one near the mi
17、ddle of the coil or reel. In the case ofreels, the center and one end may not be accessible and theprescribed measurement shall be taken along the length of theaccessible material. If any of the selected coils or reels fail toconform to the requirements as prescribed in 6.2, all coils orreels shall
18、be measured in the manner specified.7. Thickness of Aluminum7.1 The aluminum thickness at any point shall be not lessthan 10 % of the nominal wire radius. Measurements shall beread to the nearest 0.001 in. (0.03 mm). In determining therequired or measured thickness, fractions of 0.0005 in. (0.013mm)
19、 or less shall be dropped and for fractions of greater than0.0005 in. (0.013 mm), the next larger 0.001 in. (0.003 mm)shall be used.7.2 Measurements shall be made by using suitable electricalindicating instruments operating on the permeameter principle,or by direct measurement. For referee purposes,
20、 direct mea-surement shall be used to determine aluminum thickness onspecimens taken from the ends of the coils.8. Density8.1 For the purpose of calculating mass, cross sections, etc.,the density of the wire shall be taken as 0.2381 lb/in.3(6.590g/cm3) at 20C.9. Resistance9.1 The electrical resistan
21、ce of the wire shall be determinedby resistance measurements and maximum allowable resis-tance shall be based on the nominal diameter of the wire andthe resistivity value of 51.01V cmil/ft (0.08480 Vmm2/m) at20C. Electrical resistance is calculated by the followingequations:Resistance V/ft!5R/S (1)w
22、here:R = resistivity, rc mil/ft, andS = nominal diameter, milsor,Resistance V/m!5R/C (2)where:R = resistivity, rmm2/m, andC = nomimal cross section, mm29.2 When resistance measurements are made at tempera-tures other than 20C, corrections shall be based on a tempera-ture coefficient of resistance of
23、 0.0036/C (0.0020/F).9.3 Tests to determine conformance to the resistivity of 9.1shall be made in accordance with Test Method B 193.10. Joints10.1 There shall be no joints of any kind made in thefinished wire.10.2 Joints may be made in the rods or semifinished wiresprior to drawing to final size. Th
24、e finished wire at such jointsshall meet the requirements of 7.1.10.3 Welding equipment and procedure shall be such that itcan be demonstrated that the ultimate tensile strength of afinished wire specimen containing the welded section shall benot less than the stress at 1.0 % extension as shown in T
25、able 1.10.4 A welded section, wherever encountered, shall not berequired to meet the stress at 1 % extension, elongation, andtorsion tests.11. Finish11.1 The surface of the wire shall be smooth and free fromimperfections not consistent with good commercial practice.TABLE 1 Tensile RequirementsNomina
26、lDiameter,in. (mm)Stress at 1.0 %Extension min,psi (MPa)Ultimate TensileStrength, min,psi (MPa)Elongation,min, %, 10 in.(250 mm)0.0770 to 0.1289 175 000 (1206) 195 000 (1344) 1.5(1.956 to 3.274), incl0.1290 to 0.1369 170 000 (1172) 190 000 (1310) 1.5(3.275 to 3.477), incl0.1370 to 0.1443 165 000 (11
27、37) 185 000 (1275) 1.5(3.478 to 3.665), incl0.1444 to 0.1549 160 000 (1103) 180 000 (1241) 1.5(3.666 to 3.934), incl0.1550 to 0.1620 160 000 (1103) 175 000 (1206) 1.5(3.935 to 4.115), incl0.1621 to 0.1729 155 000 (1068) 170 000 (1172) 1.5(4.116 to 4.392), incl0.1730 to 0.1819 150 000 (1034) 165 000
28、(1137) 1.5(4.393 to 4.620), incl0.1820 to 0.1880 145 000 (1000) 160 000 (1103) 1.5(4.621 to 4.775), inclTABLE 2 Initial Settings for Determining at 1 % ExtensionNominal Diameter,in. (mm)Initial Stress,psi (MPa)Initial Setting ofExtensometer,% in./in. (cm/cm)0.0770 to 0.0999 11 800 (81) 0.0005 (0.05
29、% extension)(1.956 to 2.537), incl0.1000 to 0.1299 23 500 (162) 0.0010 (0.10 % extension)(2.538 to 3.299), incl0.1300 to 0.1880 35 300 (243) 0.0015 (0.15 % extension)(3.300 to 4.775), inclTABLE 3 Wire Diameter VariationsNominal Diameter,in. (mm)Permissible Variations inNominal Diameter,0.0770 to 0.0
30、999 0.0015 in. (0.038 mm)(1.956 to 2.537), incl0.1000 to 0.1880 1.5 %(2.538 to 4.775), inclB 502 02 (2007)212. Number of Tests12.1 One test specimen shall be taken from each lot of tencoils as clad and drawn, before splitting into individual coils,and tested to determine compliance with Sections 5,
31、6, 7, 9, and13.13. Torsion Test13.1 The wire shall withstand without fracture not less than20 twists in a length equivalent to 100 times the nominaldiameter of the wire. In this test, the specimen shall be grippedat its ends in vises, one of which shall be free to movelongitudinally during the test.
32、 A small tensile load of approxi-mately 15 lb (67 N) shall be applied to the specimen duringtesting. The specimen shall be twisted by rotating one of thevises at a rate of approximately 15 twists/min in the samedirection until fracture occurs. The number of twists shall beindicated by a counter or o
33、ther suitable device.13.2 Specimens after twisting to destruction shall not revealany seams, pits, slivers, or surface imperfections of sufficientmagnitude to indicate inherent defects or imperfections in thewire. Examination of the wire at the break shall show noseparation of the aluminum from the
34、steel.14. Inspection14.1 Unless otherwise agreed upon, all tests and inspectionsshall be made at the place of manufacture. The manufacturershall afford the inspector representing the purchaser all reason-able facilities necessary to ensure that the material is beingfurnished in accordance with this
35、specification.15. Rejection15.1 If the wire fails in the first test to meet any require-ments of this specification, two additional tests for theserequirements shall be made on specimens of wire from thesame coil or reel. If failure occurs in either of these tests, thelot of wire shall be rejected.
36、However, the lot may beresubmitted for inspection by testing every coil or reel for therequirement which caused the specimen to fail and sorting outthe defective coils or reels.16. Product Marking16.1 A weather-resistant tag shall be attached to the outsideof each coil or reel showing the manufactur
37、ers name ortrademark with the approximate length, net mass, and nominalsize of wire. Each coil shall also have a tag inside the wrappingshowing the manufacturers name, the size, approximatelength, and net mass. If additional information is required thisshall be arranged with the manufacturer at the
38、time ofpurchase.17. Packaging and Shipping17.1 Package size shall be agreed upon by the manufacturerand the purchaser in the placing of individual purchase orders.17.2 The wire shall be protected against damage in ordinaryhandling and shipping.18. Keywords18.1 aluminum-clad steel core wire for alumi
39、num conduc-tors; aluminum-clad steel reinforced; ASCR; clad steel corewireASTM 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
40、of any such patent rights, and the riskof 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
41、are invited either for revision of this 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 r
42、eceived a fair hearing you shouldmake your 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).B 502 02 (2007)3
