ASTM B957/B957M-08e1

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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2008
• 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

• Replaces: ASTM B957-08 - Standard Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Overhead Electrical Conductors
• Effective Date: 01-Nov-2008
• Replaced By: ASTM B957/B957M-16 - Standard Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated (Galvanized) Steel Core Wire for Overhead Electrical Conductors
• Effective Date: 01-Dec-2016
• Referred By: ASTM B232/B232M-22 - Standard Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Reinforced (ACSR)
• Effective Date: 01-Nov-2008
• Referred By: ASTM B500/B500M-22 - Standard Specification for Metallic Coated or Aluminum Clad Stranded Steel Core for Use in Overhead Electrical Conductors
• Effective Date: 01-Nov-2008
• Referred By: ASTM B857-22 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Supported (ACSS/TW)
• Effective Date: 01-Nov-2008
• Referred By: ASTM B856-22 - Standard Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Supported (ACSS)
• Effective Date: 01-Nov-2008
• Referred By: ASTM B711-22 - Standard Specification for Concentric-Lay-Stranded Aluminum-Alloy Conductors, Steel Reinforced (AACSR) (6201)
• Effective Date: 01-Nov-2008
• Referred By: ASTM B1006-17 - Standard Specification for Electrical Overhead Conductor Code Word Names
• Effective Date: 01-Nov-2008

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
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Designation:B957/B957M −08
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 E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1.1 This specification covers round, extra-high-strength and
ultra-high-strength, Class A zinc-coated (galvanized), steel
3. Terminology
core wire used for use in Overhead Electrical Conductors.
3.1 Definitions of Terms Specific to This Standard:
1.2 This specification covers wire of diameter from 0.0500
3.1.1 Lot, n—Unless otherwise specified in the contract or
to 0.1900 in. inclusive or 1.27 to 4.82 mm inclusive.
order, a lot shall consist of all coils of wire of the same
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
each system may not be exact equivalents; therefore, each
3.1.2 Product Code, n—Defines product coating type, coat-
system shall be used independently of the other. Combining
ing class and strength grade.
values from the two systems may result in non-conformance
• Extra High Strength Grade Zinc, ClassACoated, use Code
with the standard.
GA4.
• Ultra High Strength Grade Zinc, Class A Coated, use Code
1.4 This standard does not purport to address all of the
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-
4.1 Orders for material under this specification shall include
bility of regulatory limitations prior to use.
the following information:
4.1.1 Quantity of each size,
2. Referenced Documents
4.1.2 Wire diameter in inches or millimeter (Section 13),
2
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), and
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
4.1.5 Package size (Section 19).
A370 Test Methods and Definitions for Mechanical Testing
4.1.6 Strength Grade
of Steel Products
A751 Test Methods, Practices, and Terminology for Chemi- 5. Materials and Manufacture
cal Analysis of Steel Products
5.1 The base metal shall be steel produced by the open-
B6 Specification for Zinc
hearth, electric-furnace, or basic-oxygen process.
B193 Test Method for Resistivity of Electrical Conductor
5.2 The wire shall be cold drawn and coated with zinc to
Materials
produce the desired properties.
5.3 The slab zinc used for coating shall be high grade or
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This test method 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. 6. Chemical Composition
Current edition approved Nov. 1, 2008. Published December 2008. DOI:
6.1 The steel shall conform to the requirements prescribed
10.1520/B0957_B0957M-08E01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or in Table 1.
contact ASTM Customer Service at [e-mail]. 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.
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B957/B957M−08
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 0.40 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 0.60 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
Specified Stress at Ultimate Elongation
tensile and elongation requirements prescribed in Table 2, Diameter, 1% Extension, Tensile in 10 in.
in. min, kpsi
...