ASTM B958/B958M-23
(Specification)Standard Specification for Extra-High-Strength and Ultra-High-Strength Class A Zinc–5% Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use in Overhead Electrical Conductors
Standard Specification for Extra-High-Strength and Ultra-High-Strength Class A Zinc–5% Aluminum-Mischmetal Alloy-Coated 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 coated zinc–5 % aluminum-mischmetal (Zn–5Al–MM) alloy-coated, steel core wire 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: B958/B958M − 23
Standard Specification for
Extra-High-Strength and Ultra-High-Strength Class A
Zinc–5% Aluminum-Mischmetal Alloy-Coated Steel Core
1
Wire for Use in Overhead Electrical Conductors
This standard is issued under the fixed designation B958/B958M; 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 A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
1.1 This specification covers round, extra-high-strength, and
A751 Test Methods and Practices for Chemical Analysis of
ultra-high-strength, Class A coated zinc–5 % aluminum-
Steel Products
mischmetal (Zn–5Al–MM) alloy-coated, steel core wire for
B193 Test Method for Resistivity of Electrical Conductor
use in Overhead Electrical Conductors.
Materials
1.2 This specification covers wire of diameter from
B750 Specification for GALFAN (Zinc-5 % Aluminum-
0.0500 in. to 0.1900 in. inclusive or 1.27 mm to 4.82 mm
Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings
inclusive.
E1277 Test Method for Analysis of Zinc-5 % Aluminum-
Mischmetal Alloys by Inductively Coupled Plasma
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in Atomic Emission Spectrometry
E29 Practice for Using Significant Digits in Test Data to
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining Determine Conformance with Specifications
E47 Test Methods for Chemical Analysis of Zinc Die-
values from the two systems may result in non-conformance
3
with the standard. Casting Alloys (Withdrawn 1997)
2.2 Other Standard:
1.4 This standard does not purport to address all of the
GF-1 Standard Practice for Determination of Cerium and
safety concerns, if any, associated with its use. It is the
Lanthanum Compositions in Galfan Alloy (5 % Al-0.04 %
responsibility of the user of this standard to establish appro-
4
La-0.04 % Ce-Bal SHG Zn)
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3. Terminology
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard- 3.1 Abbreviations:
ization established in the Decision on Principles for the 3.1.1 MM—mischmetal
Development of International Standards, Guides and Recom- 3.1.2 Zn–5Al–MM—zinc–5 % aluminum mischmetal alloy
mendations issued by the World Trade Organization Technical
3.2 Definitions of Terms Specific to This Standard:
Barriers to Trade (TBT) Committee.
3.2.1 lot, n—unless otherwise specified in the contract or
order, a lot shall consist of all coils of wire of the same
2. Referenced Documents
diameter and unit lengths submitted for inspection at the same
2
2.1 ASTM Standards:
time.
A90/A90M Test Method for Weight [Mass] of Coating on
3.2.2 product code, n—defines product coating type, coating
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
class, and strength grade.
3.2.2.1 Extra High Strength Grade Zn–5Al–MM, Class A
Coated—use Code MA4.
1
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.05 on
3.2.2.2 Ultra High Strength Grade Zn–5Al–MM, Class A
Conductors of Ferrous Metals.
Coated—use Code MA5.
Current edition approved Oct. 1, 2023. Published October 2023. Originally
approved in 2008. Last previous edition approved in 2022 as B958/B958M – 22.
DOI: 10.1520/B0958_B0958M-23.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM www.astm.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from the International Lead Zinc Research Organization (ILZRO),
the ASTM website. 1822 NC Highway 54 East, Suite 120, Durham NC 27713, http://www.ilzro.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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B958/B958M − 23
TABLE 2 Grade 4 Extra-High-Strength Tensile Requirements
4. Ordering Information
Stress Ultimate Elongation
4.1 Orders for material under this specification shall include
Specified Diameter, at 1 % Tensile in 10 in.,
the following information:
in. Extension,
...
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: B958/B958M − 22 B958/B958M − 23
Standard Specification for
Extra-High-Strength and Ultra-High-Strength Class A
Zinc–5% Aluminum-Mischmetal Alloy-Coated Steel Core
1
Wire for Use in Overhead Electrical Conductors
This standard is issued under the fixed designation B958/B958M; 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 coated zinc–5 % aluminum-mischmetal
(Zn–5Al–MM) alloy-coated, steel core wire for use in Overhead Electrical Conductors.
1.2 This specification covers wire of diameter from 0.05000.0500 in. to 0.1900 in. inclusive or 1.271.27 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
B193 Test Method for Resistivity of Electrical Conductor Materials
B750 Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings
E1277 Test Method for Analysis of Zinc-5 % Aluminum-Mischmetal Alloys by Inductively Coupled Plasma Atomic Emission
Spectrometry
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
3
E47 Test Methods for Chemical Analysis of Zinc Die-Casting Alloys (Withdrawn 1997)
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 November 2022October 2023. Originally approved in 2008. Last previous edition approved in 20192022
as B958/B958M – 19.B958/B958M – 22. DOI: 10.1520/B0958_B0958M-22.10.1520/B0958_B0958M-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.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
B958/B958M − 23
2.2 Other Standard:
GF-1 Standard Practice for Determination of Cerium and Lanthanum Compositions in Galfan Alloy (5 % Al-0.04 % La-0.04 %
4
Ce-Bal SHG Zn)
3. Terminology
3.1 Abbreviations:
3.1.1 MM—mischmetal
3.1.2 Zn–5Al–MM—zinc–5 % aluminum mischmetal alloy
3.2 Definitions of Terms Specific to This Standard:
3.2.1 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.
3.2.2 product code, n—defines product coating type, coating class, and strength grade.
3.2.2.1 Extra High Strength Grade Zn–5Al–MM, Class A Coated—use Code MA4.
3.2.2.2 Ultra High Strength Grade Zn–5Al–MM, Class A Coated—use Code MA5.
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.
...
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