ASTM B958/B958M-22

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 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: 30-Sep-2022
• ICS: 77.140.65 - Steel wire, wire ropes and link chains
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.05 - Conductors of Ferrous Metals

Relations

• Replaced By: ASTM B958/B958M-23 - 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
• Effective Date: 01-Oct-2023
• Refers: ASTM A370-19 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Jul-2019
• Refers: ASTM A370-17a - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Nov-2017
• Refers: ASTM A370-17 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Jan-2017
• Refers: ASTM B193-16 - Standard Test Method for Resistivity of Electrical Conductor Materials
• Effective Date: 01-Apr-2016
• Refers: ASTM A370-15 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Nov-2015
• Refers: ASTM A370-14 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-May-2014
• Refers: ASTM B193-02(2014) - Standard Test Method for Resistivity of Electrical Conductor Materials
• Effective Date: 01-Apr-2014
• Refers: ASTM A751-14 - Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
• Effective Date: 01-Mar-2014
• Refers: ASTM A370-13 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Nov-2013
• Refers: ASTM A370-12a - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Oct-2012
• Refers: ASTM B750-12 - Standard Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings
• Effective Date: 01-May-2012
• Refers: ASTM A370-12 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Mar-2012
• Refers: ASTM A370-11a - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Nov-2011
• Refers: ASTM A370-10 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Jun-2010

Standards Content (Sample)

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 −22
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 A751 Test Methods and Practices for Chemical Analysis of
Steel Products
1.1 Thisspecificationcoversround,extra-high-strength,and
B193 Test Method for Resistivity of Electrical Conductor
ultra-high-strength, Class A coated zinc–5 % aluminum-
Materials
mischmetal (Zn–5Al–MM) alloy-coated, steel core wire for
B750 Specification for GALFAN (Zinc-5 % Aluminum-
use in Overhead Electrical Conductors.
Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings
1.2 This specification covers wire of diameter from 0.0500
E1277 Test Method for Analysis of Zinc-5 % Aluminum-
to 0.1900 in. inclusive or 1.27 to 4.82 mm inclusive.
Mischmetal Alloys by ICP Emission Spectrometry
1.3 The values stated in either SI units or inch-pound units E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each 2.2 Other Standard:
GF-1 Standard Practice for Determination of Cerium and
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance Lanthanum Compositions in GalfanAlloy (5 %Al-0.04 %
3
La-0.04 % Ce-Bal SHG Zn)
with the standard.
1.4 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Abbreviations:
responsibility of the user of this standard to establish appro-
3.1.1 MM—mischmetal
priate safety, health, and environmental practices and deter-
3.1.2 Zn–5Al–MM—zinc–5 % aluminum mischmetal alloy
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
3.2 Definitions of Terms Specific to This Standard:
dance with internationally recognized principles on standard-
3.2.1 lot, n—unless otherwise specified in the contract or
ization established in the Decision on Principles for the
order, a lot shall consist of all coils of wire of the same
Development of International Standards, Guides and Recom-
diameter and unit lengths submitted for inspection at the same
mendations issued by the World Trade Organization Technical
time.
Barriers to Trade (TBT) Committee.
3.2.2 product code, n—defines product coating type, coating
class, and strength grade.
2. Referenced Documents
2 3.2.2.1 Extra High Strength Grade Zn–5Al–MM, Class A
2.1 ASTM Standards:
Coated—use Code MA4.
A90/A90M Test Method for Weight [Mass] of Coating on
3.2.2.2 Ultra High Strength Grade Zn–5Al–MM, Class A
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
Coated—use Code MA5.
A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
4. Ordering Information
1 4.1 Orders for material under this specification shall include
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.05 on
the following information:
Conductors of Ferrous Metals.
4.1.1 Quantity of each size,
Current edition approved Oct. 1, 2022. Published November 2022. Originally
4.1.2 Wire diameter in inches or millimeter (Section 13),
approved in 2008. Last previous edition approved in 2019 as B958/B958M – 19.
4.1.3 Certification, if required (Section 18),
DOI: 10.1520/B0958_B0958M-22.
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
3
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

---------------------- Page: 1 ----------------------
B958/B958M−22
TABLE 2 Grade 4 Extra-High-Strength Tensile Requirements
4.1.4 Test report, if required (Section 18),
4.1.5 Package size (Section 19), and Stress Ultimate Elongation
Specified Diameter, at 1 % Tensile in 10 in.,
4.1.6 Product code.
...

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 − 19 B958/B958M − 22
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 0.0500 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.
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 ICP Emission Spectrometry
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
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 March 1, 2019Oct. 1, 2022. Published April 2019November 2022. Originally approved in 2008. Last previous edition approved in 20162019
as B958B958/B958M – 19. – 16. DOI: 10.1520/B0958_B0958M-19.10.1520/B0958_B0958M-22.
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 ----------------------
B958/B958M − 22
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
3
La-0.04 % 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,lot, n—Unlessunless 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,product code, n—Definesdefines 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),
4.1.3 Certification, if required (Section 18),
4.1.4 Test report, if required (Section 18), and
4.1.5 Package Sizesize (Section 19).), and
4.1.6 Product Codecode.
5. Materials and Manufacture
5
...

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: B958/B958M − 22
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 A751 Test Methods and Practices for Chemical Analysis of
Steel Products
1.1 This specification covers round, extra-high-strength, and
B193 Test Method for Resistivity of Electrical Conductor
ultra-high-strength, Class A coated zinc–5 % aluminum-
Materials
mischmetal (Zn–5Al–MM) alloy-coated, steel core wire for
B750 Specification for GALFAN (Zinc-5 % Aluminum-
use in Overhead Electrical Conductors.
Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings
1.2 This specification covers wire of diameter from 0.0500
E1277 Test Method for Analysis of Zinc-5 % Aluminum-
to 0.1900 in. inclusive or 1.27 to 4.82 mm inclusive.
Mischmetal Alloys by ICP Emission Spectrometry
E29 Practice for Using Significant Digits in Test Data to
1.3 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in Determine Conformance with Specifications
each system may not be exact equivalents; therefore, each 2.2 Other Standard:
system shall be used independently of the other. Combining GF-1 Standard Practice for Determination of Cerium and
Lanthanum Compositions in Galfan Alloy (5 % Al-0.04 %
values from the two systems may result in non-conformance
3
with the standard. La-0.04 % Ce-Bal SHG Zn)
1.4 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Abbreviations:
responsibility of the user of this standard to establish appro-
3.1.1 MM—mischmetal
priate safety, health, and environmental practices and deter-
3.1.2 Zn–5Al–MM—zinc–5 % aluminum mischmetal alloy
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
3.2 Definitions of Terms Specific to This Standard:
dance with internationally recognized principles on standard-
3.2.1 lot, n—unless otherwise specified in the contract or
ization established in the Decision on Principles for the
order, a lot shall consist of all coils of wire of the same
Development of International Standards, Guides and Recom-
diameter and unit lengths submitted for inspection at the same
mendations issued by the World Trade Organization Technical
time.
Barriers to Trade (TBT) Committee.
3.2.2 product code, n—defines product coating type, coating
class, and strength grade.
2. Referenced Documents
2
3.2.2.1 Extra High Strength Grade Zn–5Al–MM, Class A
2.1 ASTM Standards:
Coated—use Code MA4.
A90/A90M Test Method for Weight [Mass] of Coating on
3.2.2.2 Ultra High Strength Grade Zn–5Al–MM, Class A
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
Coated—use Code MA5.
A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
4. Ordering Information
1
4.1 Orders for material under this specification shall include
This specification is under the jurisdiction of ASTM Committee B01 on
Electrical Conductors and is the direct responsibility of Subcommittee B01.05 on the following information:
Conductors of Ferrous Metals.
4.1.1 Quantity of each size,
Current edition approved Oct. 1, 2022. Published November 2022. Originally
4.1.2 Wire diameter in inches or millimeter (Section 13),
approved in 2008. Last previous edition approved in 2019 as B958/B958M – 19.
4.1.3 Certification, if required (Section 18),
DOI: 10.1520/B0958_B0958M-22.
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
3
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

---------------------- Page: 1 ----------------------
B958/B958M − 22
TABLE 2 Grade 4 Extra-High-Strength Tensile Requirements
4.1.4 Test report, if required (Section 18),
4.1.5 Package size (Section 19), and Stress Ultimate Elongation
Specified Diameter, at 1 % Tensile in 10 in.,
4.1.6 Product code.
in. Extension, Strength, min %
min, kpsi min, kpsi
5. Materials and Manufacture
0.0500 to 0.0899, incl 225 265 3.0
0.0900 to 0.11
...