ASTM B957/B957M-23
(Specification)Standard Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Use in Overhead Electrical Conductors
Standard Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Use in 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 in. to 0.1900 in. inclusive or 1.27 mm 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.
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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.
Designation: B957/B957M − 23
Standard Specification for
Extra-High-Strength and Ultra-High-Strength Zinc-Coated
(Galvanized) Steel Core Wire for Use in 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 and Practices for Chemical 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
E29 Practice for Using Significant Digits in Test Data to
0.0500 in. to 0.1900 in. inclusive or 1.27 mm to 4.82 mm
Determine Conformance with Specifications
inclusive.
1.3 The values stated in either SI units or inch-pound units 3. Terminology
are to be regarded separately as standard. The values stated in
3.1 Definitions of Terms Specific to This Standard:
each system may not be exact equivalents; therefore, each
3.1.1 lot, n—unless otherwise specified in the contract or
system shall be used independently of the other. Combining
order, a lot shall consist of all coils of wire of the same
values from the two systems may result in non-conformance
diameter and unit lengths submitted for inspection at the same
with the standard.
time.
1.4 This standard does not purport to address all of the
3.1.2 product code, n—defines product coating type, coating
safety concerns, if any, associated with its use. It is the
class and strength grade.
responsibility of the user of this standard to establish appro-
3.1.2.1 Extra High Strength Grade Zinc, Class A Coated—
priate safety, health, and environmental practices and deter-
use Code GA4.
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
3.1.2.2 Ultra High Strength Grade Zinc, Class A Coated—
dance with internationally recognized principles on standard-
use Code GA5.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4. Ordering Information
mendations issued by the World Trade Organization Technical
4.1 Orders for material under this specification shall include
Barriers to Trade (TBT) Committee.
the following information:
4.1.1 Quantity of each size,
2. Referenced Documents
2
4.1.2 Wire diameter in inches or millimeter (Section 13),
2.1 ASTM Standards:
4.1.3 Certification, if required (Section 18),
A90/A90M Test Method for Weight [Mass] of Coating on
4.1.4 Test report, if required (Section 18),
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
4.1.5 Package size (Section 19), and
A370 Test Methods and Definitions for Mechanical Testing
4.1.6 Strength grade.
of Steel Products
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 Oct. 1, 2023. Published October 2023. Originally
approved in 2008. Last previous edition approved in 2022 as B957/B957M – 22.
5.2 The wire shall be cold drawn and coated with zinc to
DOI: 10.1520/B0957_B0957M-23.
2
produce the desired properties.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. 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 − 23
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 and Pract
...
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 − 22 B957/B957M − 23
Standard Specification for
Extra-High-Strength and Ultra-High-Strength Zinc-Coated
(Galvanized) Steel Core Wire for Use in 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 in. to 0.1900 in. inclusive or 1.27 mm 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.
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 and Practices 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:
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 Oct. 1, 2022Oct. 1, 2023. Published October 2022October 2023. Originally approved in 2008. Last previous edition approved in 20192022 as
B957/B957M – 19. DOI: 10.1520/B0957_B0957M-22.22. DOI: 10.1520/B0957_B0957M-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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 − 23
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,
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),
4.1.5 Package size (Section 19), and
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 and Practices A751.
7. Tensile Test
7.1 The zinc-coated steel core wire s
...
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