ASTM B520-12

Standard Specification for Tin-Coated, Copper-Clad Steel Wire for Electronic<brk/> Application

ABSTRACT
This specification covers tin-coated, copper-clad steel wires for electronic applications. The four classes of steel wires considered here are: hard-drawn wires with 30% nominal conductivity (Class T30HS); annealed wires with 30% nominal conductivity (Class T30A); hard-drawn wires with 40% nominal conductivity (Class T40HS); and annealed wires with 40% nominal conductivity (Class T40A). Specimens shall go through tests and shall adhere to specified requirements for dimensions, electrical resistivity, tensile strength, and coating continuity and adherence.
SCOPE
1.1 This specification covers tin-coated copper-clad steel wire for electronic application.  
1.2 Four classes of tin-coated copper-clad steel wire are covered as follows:  
1.2.1 Class T30HS—Nominal 30 % conductivity, hard-drawn,  
1.2.2 Class T30A—Nominal 30 % conductivity, annealed,  
1.2.3 Class T40HS—Nominal 40 % conductivity, hard-drawn, and  
1.2.4 Class T40A—Nominal 40 % conductivity, annealed.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3.1 Exception—The SI values for resistivity and volume are to be regarded as standard.  
1.4 The following safety hazards caveat pertains only to the test method portion, Section 6, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (Warning—Consideration should be given to toxicity and flammability when selecting solvent cleaners.)

General Information

• Status: Historical
• Publication Date: 14-Oct-2012
• ICS: 29.060.10 - Wires
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.06 - Bi-Metallic Conductors

Relations

• Replaces: ASTM B520-93(2007) - Standard Specification for Tin-Coated, Copper-Clad Steel Wire for Electronic Application
• Effective Date: 15-Oct-2012
• Replaced By: ASTM B520-12(2017) - Standard Specification for Tin-Coated, Copper-Clad Steel Wire for Electronic Application
• Effective Date: 01-Apr-2017

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B520 −12
Standard Specification for
Tin-Coated, Copper-Clad Steel Wire for Electronic
1
Application
This standard is issued under the fixed designation B520; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
2
1. Scope 2.2 ASTM Standards:
B193 Test Method for Resistivity of Electrical Conductor
1.1 This specification covers tin-coated copper-clad steel
Materials
wire for electronic application.
B258 Specification for Nominal Diameters and Cross-
SectionalAreasofAWGSizesofSolidRoundWiresUsed
1.2 Four classes of tin-coated copper-clad steel wire are
as Electrical Conductors
covered as follows:
B452 Specification for Copper-Clad Steel Wire for Elec-
1.2.1 Class T30HS—Nominal 30 % conductivity, hard-
tronic Application
drawn,
3
2.3 National Institute of Standards and Technology:
1.2.2 Class T30A—Nominal 30 % conductivity, annealed,
NBS Handbook 100 Copper Wire Tables
1.2.3 Class T40HS—Nominal 40 % conductivity, hard-
drawn, and
3. Ordering Information
1.2.4 Class T40A—Nominal 40 % conductivity, annealed.
3.1 Orders for material under this specification shall include
the following information:
1.3 The values stated in inch-pound units are to be regarded
3.1.1 Quantity of each size.
as standard. The values given in parentheses are mathematical
3.1.2 Wire size (see 5.3 and Table 1),
conversions to SI units that are provided for information only
3.1.3 Class of wire (see 1.2),
and are not considered standard.
3.1.4 Package size and shipping (see 7.1.7 and Section 9),
1.3.1 Exception—The SI values for resistivity and volume
packaging inspection if required (see 9.3.3),
are to be regarded as standard.
3.1.5 Special package marking, if required, and
3.1.6 Place of inspection (see 9.1).
1.4 The following safety hazards caveat pertains only to the
test method portion, Section 6, of this specification: This
4. Material
standard does not purport to address all of the safety concerns,
if any, associated with its use. It is the responsibility of the user 4.1 Thebasismaterialshallconsistofcopper-cladsteelwire
of this standard to establish appropriate safety and health conforming to the product description, quality and specifica-
tion requirements of Specification B452.
practices and determine the applicability of regulatory limita-
tions prior to use.(Warning—Consideration should be given
4.2 Thetin-coatedwireshallconsistofthebasiswirecoated
to toxicity and flammability when selecting solvent cleaners.)
with tin. The tin used for coating shall be commercially pure
(Note 1). For purposes of this specification, the tin shall be
2. Referenced Documents
considered“ commercially pure” if the total of other elements,
exclusive of copper, does not exceed 1 %. Notwithstanding the
2.1 The following documents of the issue in effect on date
previoussentence,chemicalanalysisofthetincoatingorofthe
of material purchase form a part of this specification to the
tin used for coating shall not be required under this specifica-
extent referenced herein:
tion.Adequacyofthetincoatingisassuredbythecontinuityof
1 2
This specification is under the jurisdiction of ASTM Committee B01 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Bi-Metallic Conductors. Standards volume information, refer to the standard’ Document Summary page on
Current edition approved Oct. 15, 2012. Published November 2012. Originally the ASTM website.
3
approved in 1970. Last previous edition approved in 2007 as B520 – 93 (2007). Available from National Institute of Standards and Technology (NIST), 100
DOI: 10.1520/B0520-12. Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B520−12
TABLE 1 Wire Sizes TABLE 2 Resistivity, max at 20°C
Diameter Cross-Sectional Area at 20°C (68°F) Class of Nominal Diameter, in.
2
Ω·mm /m
Wire (mm)
2 2
in. mm cmil in. mm
T30HS 0.0720 (1.829) to 0.06743
0.0720 1.8129 5180 0.00407 2.63
0.0201 (0.511) incl (0.067427)
0.0641 1.6128 4110 0.00323 2.08
and under 0.0201 (0.511) to 0.07315
0.0571 1.450 3260 0.00256 1.65
0.0113 (0.287) incl (0.073148)
0.0508 1.290 2580 0.00203 1.31
T30A under 0.0113 (0.287) to 0.07642
0.0453 1.151 2050 0.00161 1.04
0.0031 (0.079) incl (0.076423)
0.0403 1.024 162
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B520 − 93 (Reapproved 2007) B520 − 12
Standard Specification for
Tin-Coated, Copper-Clad Steel Wire for Electronic
1
Application
This standard is issued under the fixed designation B520; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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 covers tin-coated copper-clad steel wire for electronic application.
1.2 Four classes of tin-coated copper-clad steel wire are covered as follows:
1.2.1 Class T30HS—Nominal 30 % conductivity, hard-drawn,
1.2.2 Class T30A—Nominal 30 % conductivity, annealed,
1.2.3 Class T40HS—Nominal 40 % conductivity, hard-drawn, and
1.2.4 Class T40A—Nominal 40 % conductivity, annealed.
1.3 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may
be approximate. The values given in parentheses are for information only.standard. The values given in parentheses are
mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3.1 Exception—The SI values for resistivity and volume are to be regarded as standard.
1.4 The following safety hazards caveat pertains only to the test method portion, Section 6, of this specification:This standard
does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to
use.(Warning—Consideration should be given to toxicity and flammability when selecting solvent cleaners.)
2. Referenced Documents
2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extent
referenced herein:
2
2.2 ASTM Standards:
B193 Test Method for Resistivity of Electrical Conductor Materials
B258 Specification for Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical
Conductors
B452 Specification for Copper-Clad Steel Wire for Electronic Application
3
2.3 National Institute of Standards and Technology:
NBS Handbook 100 Copper Wire Tables
3. Ordering Information
3.1 Orders for material under this specification shall include the following information:
3.1.1 Quantity of each size.
3.1.2 Wire size (see 5.3 and Table 1),
3.1.3 Class of wire (see 1.2),
3.1.4 Package size and shipping (see 7.1.7 and Section 9), packaging inspection if required (see 9.3.3),
1
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.06 on Composite
Conductors.
Current edition approved Oct. 1, 2007Oct. 15, 2012. Published October 2007November 2012. Originally approved in 1970. Last previous edition approved in 20022007
ε1
as B520 – 70 (2002)B520 – 93 (2007). DOI: 10.1520/B0520-93R07.10.1520/B0520-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from National Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B520 − 12
TABLE 1 Wire Sizes
Diameter Cross-Sectional Area at 20°C (68°F)
2 2
in. mm cmil in. mm
0.0720 1.8129 5180 0.00407 2.63
0.0641 1.6128 4110 0.00323 2.08
0.0571 1.450 3260 0.00256 1.65
0.0508 1.290 2580 0.00203 1.31
0.0453 1.151 2050 0.00161 1.04
0.0403 1.024 1620 0.00128 0.823
0.0359 0.912 1290 0.00101 0.653
0.0320 0.813 1020 0.000804 0.519
0.0285 0.724 812 0.000638 0.412
0.0253 0.643 640 0.000503 0.324
0.0226 0.574 511 0.000401 0.259
0.0201 0.511 404 0.000317 0.205
0.0179 0.455 320 0.000252 0.162
0.0159 0.404 253 0.000199 0.128
0.0142 0.361 202 0.000158 0.102
0.0126 0.320 159 0.000125 0.0804
0.0113 0.287 128 0.000100 0.0647
0.0100 0.254 100 0.0000785 0.0507
0.0089 0.226 79.2 0.0000622 0.0401
0.0080 0.203 64.0 0.0000503 0.0324
0.0071 0.180 50.4 0.0000396 0.0
...