ASTM B957/B957M-19

Standard Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Overhead Electrical Conductors

SCOPE
1.1 This specification covers round, extra-high-strength and ultra-high-strength, Class A zinc-coated (galvanized), steel core wire used for use in Overhead Electrical Conductors.  
1.2 This specification covers wire of diameter from 0.0500 to 0.1900 in. inclusive or 1.27 to 4.82 mm inclusive.  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 28-Feb-2019
• ICS: 77.140.65 - Steel wire, wire ropes and link chains
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.05 - Conductors of Ferrous Metals

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B957/B957M −19
Standard Specification for
Extra-High-Strength and Ultra-High-Strength Zinc-Coated
(Galvanized) Steel Core Wire for Overhead Electrical
1
Conductors
This standard is issued under the fixed designation B957/B957M; 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.
1. Scope A751 Test Methods, Practices, and Terminology for Chemi-
cal Analysis of Steel Products
1.1 This specification covers round, extra-high-strength and
B6 Specification for Zinc
ultra-high-strength, Class A zinc-coated (galvanized), steel
B193 Test Method for Resistivity of Electrical Conductor
core wire used for use in Overhead Electrical Conductors.
Materials
1.2 This specification covers wire of diameter from 0.0500
E29 Practice for Using Significant Digits in Test Data to
to 0.1900 in. inclusive or 1.27 to 4.82 mm inclusive.
Determine Conformance with Specifications
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in 3. Terminology
each system may not be exact equivalents; therefore, each
3.1 Definitions of Terms Specific to This Standard:
system shall be used independently of the other. Combining
3.1.1 Lot, n—Unless otherwise specified in the contract or
values from the two systems may result in non-conformance
order, a lot shall consist of all coils of wire of the same
with the standard.
diameter and unit lengths submitted for inspection at the same
1.4 This standard does not purport to address all of the
time.
safety concerns, if any, associated with its use. It is the
3.1.2 Product Code, n—Defines product coating type, coat-
responsibility of the user of this standard to establish appro-
ing class and strength grade.
priate safety, health, and environmental practices and deter-
3.1.2.1 Extra High Strength Grade Zinc, Class A Coated—
mine the applicability of regulatory limitations prior to use.
use Code GA4.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3.1.2.2 Ultra High Strength Grade Zinc, Class A Coated—
ization established in the Decision on Principles for the
use Code GA5.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Ordering Information
Barriers to Trade (TBT) Committee.
4.1 Orders for material under this specification shall include
the following information:
2. Referenced Documents
4.1.1 Quantity of each size,
2
2.1 ASTM Standards:
4.1.2 Wire diameter in inches or millimeter (Section 13),
A90/A90M Test Method for Weight [Mass] of Coating on
4.1.3 Certification, if required (Section 18),
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
4.1.4 Test report, if required (Section 18), and
A370 Test Methods and Definitions for Mechanical Testing
4.1.5 Package size (Section 19).
of Steel Products
4.1.6 Strength Grade.
1 5. Materials and Manufacture
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.05 on
5.1 The base metal shall be steel produced by the open-
Conductors of Ferrous Metals.
hearth, electric-furnace, or basic-oxygen process.
Current edition approved March 1, 2019. Published March 2019. Originally
approved in 2008. Last previous edition approved in 2016 as B957 – 16. DOI:
5.2 The wire shall be cold drawn and coated with zinc to
10.1520/B0957_B0957M-19.
2
produce the desired properties.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
5.3 The slab zinc used for coating shall be high grade or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. better, conforming to Specification B6.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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B957/B957M−19
TABLE 2 Grade 4 Extra-High-Strength Tensile Requirements
6. Chemical Composition
Stress at 1% Ultimate Tensile Elongation
6.1 The steel shall conform to the requirements prescribed Specified
Extension, Strength, in 10 in.,
Diameter, in.
in Table 1.
min, kpsi min, kpsi min %
0.0500 to 0.0899, incl 225 265 3.0
6.2 Chemical analysis shall be conducted in accordance
0.0900 to 0.1199, incl 220 260 3.0
with Test Methods, Practices, and Terminology A751.
0.1200 to 0.1399, incl 215 255 3.5
0.1400 to 0.1900, incl 210 250 3.5
7. Tensile Test
7.1 The zinc-coated steel core wire shall conform to t
...

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: B957/B957M − 16 B957/B957M − 19
Standard Specification for
Extra-High-Strength and Ultra-High-Strength Zinc-Coated
(Galvanized) Steel Core Wire for Overhead Electrical
1
Conductors
This standard is issued under the fixed designation B957/B957M; 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.
1. Scope
1.1 This specification covers round, extra-high-strength and ultra-high-strength, Class A zinc-coated (galvanized), steel core
wire used for use in Overhead Electrical Conductors.
1.2 This specification covers wire of diameter from 0.0500 to 0.1900 in. inclusive or 1.27 to 4.82 mm inclusive.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.4 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
A90/A90M Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
B6 Specification for Zinc
B193 Test Method for Resistivity of Electrical Conductor Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 Lot, n—Unless otherwise specified in the contract or order, a lot shall consist of all coils of wire of the same diameter and
unit lengths submitted for inspection at the same time.
3.1.2 Product Code, n—Defines product coating type, coating class and strength grade.
3.1.2.1 Extra High Strength Grade Zinc, Class A Coated—use Code GA4.
3.1.2.2 Ultra High Strength Grade Zinc, Class A Coated—use Code GA5.
4. Ordering Information
4.1 Orders for material under this specification shall include the following information:
4.1.1 Quantity of each size,
1
This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.05 on Conductors
of Ferrous Metals.
Current edition approved Dec. 1, 2016March 1, 2019. Published December 2016March 2019. Originally approved in 2008. Last previous edition approved in 20082016
ɛ1
as B957 – 0816. . DOI: 10.1520/B0957_B0957M-16.10.1520/B0957_B0957M-19.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B957/B957M − 19
4.1.2 Wire diameter in inches or millimeter (Section 13),
4.1.3 Certification, if required (Section 18),
4.1.4 Test report, if required (Section 18), and
4.1.5 Package size (Section 19).
4.1.6 Strength Grade.
5. Materials and Manufacture
5.1 The base metal shall be steel produced by the open-hearth, electric-furnace, or basic-oxygen process.
5.2 The wire shall be cold drawn and coated with zinc to produce the desired properties.
5.3 The slab zinc used for coating shall be high grade or better, conforming to Specification B6.
6. Chemical Composition
6.1 The steel shall conform to the requirements prescribed in Table 1.
6.2 Chemical analysis shall be conducted in accordance with Test Methods, Practices, and Terminology A751.
7. Tensile Test
7.1 The zinc-coate
...