ASTM B957/B957M-16
(Specification)Standard Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Overhead Electrical Conductors
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:B957/B957M −16
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 Determine Conformance with Specifications
1.1 This specification covers round, extra-high-strength and
3. Terminology
ultra-high-strength, Class A zinc-coated (galvanized), steel
core wire used for use in Overhead Electrical Conductors.
3.1 Definitions of Terms Specific to This Standard:
3.1.1 Lot, n—Unless otherwise specified in the contract or
1.2 This specification covers wire of diameter from 0.0500
order, a lot shall consist of all coils of wire of the same
to 0.1900 in. inclusive or 1.27 to 4.82 mm inclusive.
diameter and unit lengths submitted for inspection at the same
1.3 The values stated in either SI units or inch-pound units
time.
are to be regarded separately as standard. The values stated in
3.1.2 Product Code, n—Defines product coating type, coat-
each system may not be exact equivalents; therefore, each
ing class and strength grade.
system shall be used independently of the other. Combining
3.1.2.1 Extra High Strength Grade Zinc, Class A Coated—
values from the two systems may result in non-conformance
use Code GA4.
with the standard.
3.1.2.2 Ultra High Strength Grade Zinc, Class A Coated—
1.4 This standard does not purport to address all of the
use Code GA5.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Ordering Information
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
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.
A751 Test Methods, Practices, and Terminology for Chemi-
cal Analysis of Steel Products
5. Materials and Manufacture
B6 Specification for Zinc
5.1 The base metal shall be steel produced by the open-
B193 Test Method for Resistivity of Electrical Conductor
hearth, electric-furnace, or basic-oxygen process.
Materials
5.2 The wire shall be cold drawn and coated with zinc to
E29 Practice for Using Significant Digits in Test Data to
produce the desired properties.
5.3 The slab zinc used for coating shall be high grade or
1
This specification is under the jurisdiction of ASTM Committee B01 on
better, conforming to Specification B6.
Electrical Conductors and is the direct responsibility of Subcommittee B01.05 on
Conductors of Ferrous Metals.
Current edition approved Dec. 1, 2016. Published December 2016. Originally 6. Chemical Composition
ɛ1
approved in 2008. Last previous edition approved in 2008 as B957 – 08 . DOI:
6.1 The steel shall conform to the requirements prescribed
10.1520/B0957_B0957M-16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or in Table 1.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.2 Chemical analysis shall be conducted in accordance
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. with Test Methods, Practices, and Terminology A751.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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B957/B957M−16
TABLE 1 Chemical Requirements TABLE 3 Grade 4 Extra-High-Strength Tensile Requirements
[Metric]
Element Composition, %
Specified Stress at Ultimate Tensile Elongation
Carbon 0.50 to 1.00
Diameter, 1% Extension, Strength, in 250 mm,
Manganese 0.30 to 1.30
mm min, MPa min, MPa min %
Phosphorus, max 0.035
Sulfur, max 0.045
1.27 to 2.28, incl 1550 1825 3.0
Silicon 0.15 to 1.20 2.29 to 3.04, incl 1515 1790 3.0
3.05 to 3.55, incl 1480 1760 3.5
3.56 to 4.82, incl 1450 1725 3.5
7. Tensile Test
TABLE 4 Grade 5 Ultra-High-Strength Tensile Requirements
7.1 The zinc-coated steel core wire shall conform to the
Stress at Ultimate Elongation
Specified
tensile and elongation requirements prescribed in Table 2, 1% Extension, Tensile in 1
...
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.
´1
Designation: B957/B957M − 08 B957/B957M − 16
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
ε NOTE—Designation was corrected editorially in October 2013.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
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.
• Extra High Strength Grade Zinc, Class A Coated, use Code GA4.
• Ultra High Strength Grade Zinc, Class A Coated, use Code GA5.
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 test method 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 Nov. 1, 2008Dec. 1, 2016. Published December 2008December 2016. Originally approved in 2008. Last previous edition approved in 2008 as
ɛ1
B957 – 08 . DOI: 10.1520/B0957_B0957M-08E01.10.1520/B0957_B0957M-16.
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 − 16
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 GradeGrade.
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-coated steel core wire shall conform to the tensile and elongation requirements prescribed in Table 2, Table 3,
Table 4, or Table 5 depending on th
...
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