ASTM B802/B802M-23

Standard Specification for Zinc–5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use in Overhead Electrical Conductors

ABSTRACT
This specification covers round, zinc-aluminum mischmetal (Zn-5Al-MM) alloy-coated, steel core wire with three classes of this coating used for mechanical reinforcement in the manufacture of aluminum conductors, steel reinforced. The base metal shall be steel produced by the open-hearth, electric furnace, or basic oxygen process. The steel shall conform to the required chemical composition carbon, manganese, phosphorus, sulfur and silicon. The coated steel core wire shall conform to the required tensile and elongation properties. The wire shall be capable of being wrapped in a close helix around a cylindrical mandrel. For the purpose of calculating mass per unit length, cross sections, etc, the density of the material shall be taken. Wire diamter, mass and permissible variations shall be measured.
SCOPE
1.1 This specification covers round, zinc–5 % aluminum-mischmetal (Zn–5Al–MM) alloy-coated, steel core wire with three classes of Zn–5Al–MM coating for use in overhead electrical conductors.  
1.2 This specification covers wire of diameter from 0.0500 in. to 0.1900 in. 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 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: Published
• Publication Date: 30-Sep-2023
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: B01 - Electrical Conductors
• Drafting Committee: B01.05 - Conductors of Ferrous Metals

Relations

• Replaces: ASTM B802/B802M-22 - Standard Specification for Zinc–5 % Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Aluminum Conductors, Steel Reinforced (ACSR)
• Effective Date: 01-Oct-2023
• Refers: ASTM A370-24 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Mar-2024
• Refers: ASTM A370-23 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Sep-2023
• Referred By: ASTM B779-22 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW)
• Effective Date: 01-Oct-2023
• Referred By: ASTM B701/B701M-22e1 - Standard Specification for Concentric-Lay-Stranded Self-Damping Aluminum Conductors, Steel Reinforced (ACSR/SD)
• Effective Date: 01-Oct-2023
• Referred By: ASTM B401-22 - Standard Specification for Compact Round Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/COMP)
• Effective Date: 01-Oct-2023
• Referred By: ASTM B857-22 - Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Supported (ACSS/TW)
• Effective Date: 01-Oct-2023
• Referred By: ASTM B232/B232M-22 - Standard Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Reinforced (ACSR)
• Effective Date: 01-Oct-2023
• Referred By: ASTM B856-22 - Standard Specification for Concentric-Lay-Stranded Aluminum Conductors, Coated Steel Supported (ACSS)
• Effective Date: 01-Oct-2023
• 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-Oct-2023
• Referred By: ASTM B1006-17(2023) - Standard Specification for Electrical Overhead Conductor Code Word Names
• Effective Date: 01-Oct-2023
• Referred By: ASTM B711-22 - Standard Specification for Concentric-Lay-Stranded Aluminum-Alloy Conductors, Steel Reinforced (AACSR) (6201)
• Effective Date: 01-Oct-2023

Overview

ASTM B802/B802M-23, issued by ASTM International, specifies requirements for round, zinc–5% aluminum-mischmetal (Zn–5Al–MM) alloy-coated steel core wire used in overhead electrical conductors. This standard ensures the mechanical strength and corrosion resistance needed for steel-reinforced aluminum conductors. Covering a range of diameters from 0.0500 in. to 0.1900 in. (1.27 mm to 4.82 mm), it establishes consistent manufacturing and testing criteria for wire produced via open-hearth, electric furnace, or basic oxygen steelmaking processes. Compliance with this standard assures quality, uniformity, and reliability for applications demanding robust electrical performance and mechanical integrity.

Key Topics

• Material Requirements: Specifies the chemical composition for base steel (carbon, manganese, phosphorus, sulfur, silicon) to ensure desired mechanical properties.
• Coating Specification: Details three classes of Zn–5Al–MM alloy coatings for enhanced corrosion resistance and longevity, with precise area density and thickness requirements for each class.
• Mechanical Properties: Establishes minimum tensile strength, elongation, and stress at 1% extension for various wire diameters, ensuring strength and flexibility suitable for overhead conductors.
• Testing and Inspection:
  • Tensile Test: Verifies conformance to strength and elongation specifications.
  • Wrap Test: Ensures ductility-wires must wrap around a mandrel without fracturing.
  • Coating Adherence: Assesses the bond between the alloy coating and the steel core.
  • Dimensional Tolerances: Sets permissible variations in wire diameter, supporting consistent fit and function.
• Manufacturing Practices: Describes acceptable production methods, allowable joints, and finish standards for the coated steel wire.
• Order and Marking: Outlines details required in purchase orders, as well as packaging and labeling instructions to facilitate traceability and installation.

Applications

• Overhead Electrical Conductors: The primary application is as steel core wire in aluminum conductors, where it serves as the mechanical reinforcement for conductors used in overhead power transmission and distribution lines.
• Power Industry: Enables construction of high-reliability, long-span transmission cables resistant to corrosion and mechanical stress.
• Infrastructure Projects: Used in urban and rural grid expansions, network upgrades, or new installations owing to superior corrosion protection from the Zn–5Al–MM alloy coating.
• Extreme Environments: Effective in coastal, industrial, and other harsh environments where traditional galvanizing may be insufficient.

By specifying requirements for both mechanical and chemical properties, the standard promotes enhanced service life, reduced maintenance, and improved safety for critical electrical infrastructure.

Related Standards

• ASTM A90/A90M: Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
• ASTM A370: Mechanical Testing of Steel Products
• ASTM A751: Chemical Analysis of Steel Products
• ASTM B193: Test Method for Resistivity of Electrical Conductor Materials
• ASTM B750: Specification for GALFAN (Zinc-5% Aluminum-Mischmetal) Alloy in Ingot Form
• ASTM E1277: Analysis of Zinc-5% Aluminum-Mischmetal Alloys by ICP Atomic Emission Spectrometry
• GF-1: Practice for Determination of Cerium and Lanthanum in Galfan Alloy

Keywords: ASTM B802/B802M, zinc-aluminum mischmetal alloy-coated steel wire, steel core wire, overhead conductors, galvanized steel wire, corrosion resistance, power transmission standards.

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: B802/B802M − 23
Standard Specification for
Zinc–5 % Aluminum-Mischmetal Alloy-Coated Steel Core
Wire for Use in Overhead Electrical Conductors
This standard is issued under the fixed designation B802/B802M; 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 B193 Test Method for Resistivity of Electrical Conductor
Materials
1.1 This specification covers round, zinc–5 % aluminum-
B750 Specification for GALFAN (Zinc-5 % Aluminum-
mischmetal (Zn–5Al–MM) alloy-coated, steel core wire with
Mischmetal) Alloy in Ingot Form for Hot-Dip Coatings
three classes of Zn–5Al–MM coating for use in overhead
E47 Test Methods for Chemical Analysis of Zinc Die-
electrical conductors.
Casting Alloys (Withdrawn 1997)
1.2 This specification covers wire of diameter from
E1277 Test Method for Analysis of Zinc-5 % Aluminum-
0.0500 in. to 0.1900 in. or 1.27 mm to 4.82 mm, inclusive.
Mischmetal Alloys by Inductively Coupled Plasma
1.3 The values stated in either SI units or inch-pound units Atomic Emission Spectrometry
E29 Practice for Using Significant Digits in Test Data to
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each Determine Conformance with Specifications
2.3 Other Standard:
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance GF-1 Standard Practice for Determination of Cerium and
Lanthanum Compositions in Galfan Alloy (5 % Al-0.04 %
with the standard.
La-0.04 % Ce-Bal SHG Zn)
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3. Terminology
ization established in the Decision on Principles for the
3.1 Abbreviations:
Development of International Standards, Guides and Recom-
3.1.1 MM—mischmetal.
mendations issued by the World Trade Organization Technical
3.1.2 Zn–5Al–MM—zinc–5 % aluminum mischmetal.
Barriers to Trade (TBT) Committee.
3.2 Definitions:
2. Referenced Documents
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
2.1 The following documents of the issue in effect on date
of material purchase form a part of this specification to the diameter and unit lengths submitted for inspection at the same
time.
extent referenced herein.
3.2.2 product code, n—defines product coating type, coating
2.2 ASTM Standards:
class and strength grade; two product codes for product
A90/A90M Test Method for Weight [Mass] of Coating on
produced to this specification: Class A Zn–5Al–MM Coated =
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
MA2; and Class C Zn–5Al–MM Coated = MC2.
A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
4. Classification
A751 Test Methods and Practices for Chemical Analysis of
4.1 The wire is furnished in two classes of coating, Class A
Steel Products
or Class C, as specified, in conformance with the requirements
of Section 10 and Table 1 or Table 2.
This specification is under the jurisdiction of ASTM Committee B01 on
5. Ordering Information
Electrical Conductors and is the direct responsibility of Subcommittee B01.05 on
Conductors of Ferrous Metals.
5.1 Orders for material under this specification shall include
Current edition approved Oct. 1, 2023. Published October 2023. Originally
the following information:
approved in 1989. Last previous edition approved in 2022 as B802/B802M – 22.
DOI: 10.1520/B0802_B0802M-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 [e-mail]. For Annual Book of ASTM www.astm.org.
Standards volume information, refer to the standard’s Document Summary page on Available from International Lead Zinc Research Organization (ILZRO), 1822
the ASTM website. 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
B802/B802M − 23
TABLE 1 Zn-5Al-MM Alloy Coating
7.3.2 Method of Analysis—The determination of chemical
Area Density of Coating, min, oz/ composition shall be made in accordance with suitable chemi-
Specified Diameter of Coated Wire, 2
ft of Uncoated Wire Surface
cal (Test Methods E47 for Tin), ICP argon plasma spectromet-
in.
Class A Class C
ric (Practice E1277), or other methods. In case of dispute, the
0.0500 to 0.0599, incl 0.60 1.80
results secured by Practice E1277 shall be the basis of
0.0600 to 0.0749, incl 0.65 1.95
acceptance.
0.0750 to 0.0899, incl 0.70 2.10
0.0900 to 0.1039, incl 0.75 2.25 7.3.3 Method of Coating Material Analysis—Refer to Speci-
0.1040 to 0.1199, incl 0.80 2.40
fication B750. In case of dispute, the results secured by
0.1200 to 0.1399, incl 0.85 2.55
Practice E1277 shall be the basis of acceptance.
0.1400 to 0.1799, incl 0.90 2.70
0.1800 to 0.1900, incl 1.00 3.00
8. Tensile Test
8.1 The Zn–5Al–MM alloy-coated steel core wire shall
TABLE 2 Zn-5Al-MM Alloy Coating (Metric)
conform to the tensile and elongation requirements prescribed
Area Density of Coating, min,
2 in Table 4 or Table 5 and a minimum breaking strength (lb [N])
Specified Diameter of Coated Wire,
g/m of Uncoated Wire Surface
mm
calculated from the minimum required tensile and nominal
Class A Class C
wire diameter. The wire tensile strength used to determine
1.27 to 1.52, incl 183 549
compliance to Table 4 or Table 5 shall be calculated using the
1.53 to 1.90, incl 198 594
1.91 to 2.28, incl 214 642
actual wire breaking strength and the nominal finished diam-
2.29 to 2.64, incl 229 687
eter of the wire.
2.65 to 3.04, incl 244 732
3.05 to 3.55, incl 259 777
8.2 Tensile tests shall be conducted in accordance with Test
3.56 to 4.57, incl 274 822
Methods and Definitions A370, using the initial settings for
4.58 to 4.82, incl 305 915
determining stress at 1 % extension given in Table 6 or Table
7 of this specification.
8.3 Test Specimens—The test specimens shall be free of
5.1.1 Quantity of each size,
bends or kinks other than the curvature resulting from the usual
5.1.2 Wire diameter in inches or millimeters (Section 14),
coiling operations. Any hand straightening necessary to permit
5.1.3 Product code (see paragraphs 3.2.2 and 4.1),
insertion of the specimen in the jaws of the testing machine
5.1.4 Certification, if required (Section 19),
shall be performed by drawing between wood blocks or by
5.1.5 Test report, if required (Section 19), and
some other equally satisfactory means.
5.1.6 Package Size (Section 20).
9. Wrap Test
6. Materials and Manufacture
9.1 The material, as represented by the test specimens, shall
6.1 The base metal shall be steel produced by the open-
not fracture when the Zn–5Al–MM alloy-coated wire is
hearth, electric furnace, or basic oxygen process.
wrapped at a rate not exceeding 15 turns/min in a helix of at
6.2 The wire shall be cold drawn and coated with
least eight turns around a cylindrical mandrel with a diameter
Zn–5Al–MM alloy to produce the desired properties.
equal to two times the specified diameter of the wire under test,
65 %. The edge-to-edge spacing of consecutive turns shall not
7. Chemical Composition
exceed two times the diameter of the wire.
7.1 The steel shall conform to the requirements prescribed
in Table 3.
10. Coating Test
7.2 Chemical analysis of the steel shall be conducted in
10.1 The material, as represented by the test specimens,
accordance with Test Methods, Practices and Terminology
shall conform to the coating requirements of Table 1 or Table
A751.
2, for the diameter and class of coating specified.
7.3 The ingot form of zinc-5% aluminum-mischmetal alloy
10.2 The coating test shall be conducted in accordance with
shall conform to Specification B750.
Test Method A90/A90M.
7.3.1 For a two-step coating operation where the first
coating is zinc (hot-dip galvanized or electrogalvanized), the
11. Adherence of Coating Test
final bath may have an aluminum content of up to 7.2 %, to
11.1 The Zn–5Al–MM alloy-coated wire shall be capable of
prevent depletion of the aluminum content of the bath.
being wrapped in a close helix at a rate not exceeding 15
turns/min around a cylindrical mandrel having a diameter as
prescribed in Table 8 or Table 9, without cracking or flaking the
TABLE 3 Chemical Requirements
coating to such an extent that any Zn–5Al–MM alloy can be
Element Composition, %
removed by rubbing with the bare fingers.
Carbon 0.50 to 0.88
Manganese 0.50 to 1.10
NOTE 1—Loosening or detachment during the adhesion test of
Phosphorus, max 0.035
superficial, small particles of Zn–5Al–MM alloy formed by mechanical
Sulfur, max 0.045
Silicon 0.10 to 0.35 polishing of the surface of the coated wire shall not be considered cause
for rejection.
B802/B802M − 23
TABLE 4 Tensile Requirements
Stress at 1 % Extension, min, Ksi Ultimate Tensile Strength, min, Ksi Elongation in 10 in., min, %
Specified Diameter, in.
Class A Class C Class A Class C Class A Class C
0.0500 to 0.0899, incl 190 170 210 190 3.0 3.0
0.0900 to 0.1199, incl 185 165 205 185 3.5 3.0
0.1200 to 0.1399, incl 180 160 205 185 4.0 3.0
0.1400 to 0.1900, incl 170 155 200 180 4.0 4.0
TABLE 5 Tensile Requirements (Metric)
Ultimate Tensile Strength, min,
Stress at 1 % Extension, min, MPa Elongation in 250 mm, min, %
MPa
Specified Diameter, mm
Class A Class C Class A Class C Class A Class C
1.27 to 2.28, incl 1310
...

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: B802/B802M − 22 B802/B802M − 23
Standard Specification for
Zinc–5 % Aluminum-Mischmetal Alloy-Coated Steel Core
Wire for Aluminum Conductors, Steel Reinforced
(ACSR)Use in Overhead Electrical Conductors
This standard is issued under the fixed designation B802/B802M; 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, zinc–5 % aluminum-mischmetal (Zn–5Al–MM) alloy-coated, steel core wire with three
classes of Zn–5Al–MM coating used for mechanical reinforcement in the manufacture of aluminum conductors, steel reinforced
(ACSR).for use in overhead electrical conductors.
1.2 This specification covers wire of diameter from 0.05000.0500 in. to 0.1900 in. 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 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
2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extent
referenced herein.
2.2 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
E47 Test Methods for Chemical Analysis of Zinc Die-Casting Alloys (Withdrawn 1997)
E1277 Test Method for Analysis of Zinc-5 % Aluminum-Mischmetal Alloys by Inductively Coupled Plasma Atomic Emission
Spectrometry
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 1989. Last previous edition approved in 20192022 as
B802/B802M – 19.B802/B802M – 22. DOI: 10.1520/B0802_B0802M-22.10.1520/B0802_B0802M-23.
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.
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
B802/B802M − 23
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
2.3 Other Standard:
GF-1 Standard Practice for Determination of Cerium and Lanthanum Compositions in Galfan Alloy (5 % Al-0.04 % 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.
3.2 Definitions:
3.2.1 lot—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—code, n—defines product coating type, coating class and strength grade; two product codes for product
produced to this specification: Class A Zn–5Al–MM Coated = MA2; and Class C Zn–5Al–MM Coated = MC2.
4. Classification
4.1 The wire is furnished in two classes of coating, Class A or Class C, as specified, in conformance with the requirements of
Section 10 and Table 1 or Table 2.
5. Ordering Information
5.1 Orders for material under this specification shall include the following information:
5.1.1 Quantity of each size,
5.1.2 Wire diameter in inches or millimeters (Section 14),
5.1.3 Product code (see paragraphs 3.2.2 and 4.1),
5.1.4 Certification, if required (Section 19),
5.1.5 Test report, if required (Section 19), and
5.1.6 Package Size (Section 20).
6. Materials and Manufacture
6.1 The base metal shall be steel produced by the open-hearth, electric furnace, or basic oxygen process.
TABLE 1 Zn-5Al-MM Alloy Coating
Area Density of Coating, min, oz/
Specified Diameter of Coated Wire, 2
ft of Uncoated Wire Surface
in.
Class A Class C
0.0500 to 0.0599, incl 0.60 1.80
0.0600 to 0.0749, incl 0.65 1.95
0.0750 to 0.0899, incl 0.70 2.10
0.0900 to 0.1039, incl 0.75 2.25
0.1040 to 0.1199, incl 0.80 2.40
0.1200 to 0.1399, incl 0.85 2.55
0.1400 to 0.1799, incl 0.90 2.70
0.1800 to 0.1900, incl 1.00 3.00
Available from International Lead Zinc Research Organization (ILZRO), 1822 NC Highway 54 East, Suite 120, Durham NC 27713, http://www.ilzro.org.
B802/B802M − 23
TABLE 2 Zn-5Al-MM Alloy Coating (Metric)
Area Density of Coating, min,
Specified Diameter of Coated Wire,
g/m of Uncoated Wire Surface
mm
Class A Class C
1.27 to 1.52, incl 183 549
1.53 to 1.90, incl 198 594
1.91 to 2.28, incl 214 642
2.29 to 2.64, incl 229 687
2.65 to 3.04, incl 244 732
3.05 to 3.55, incl 259 777
3.56 to 4.57, incl 274 822
4.58 to 4.82, incl 305 915
6.2 The wire shall be cold drawn and coated with Zn–5Al–MM alloy to produce the desired properties.
7. Chemical Composition
7.1 The steel shall conform to the requirements prescribed in Table 3.
7.2 Chemical analysis of the steel shall be conducted in accordance with Test Methods, Practices and Terminology A751.
7.3 The ingot form of zinc-5% aluminum-mischmetal alloy shall conform to Specification B750.
7.3.1 For a two-step coating operation where the first coating is zinc (hot-dip galvanized or electrogalvanized), the final bath may
have an aluminum content of up to 7.2 %, to prevent depletion of the aluminum content of the bath.
7.3.2 Method of Analysis—The determination of chemical composition shall be made in accordance with suitable chemical (Test
Methods E47 for Tin), ICP argon plasma spectrometric (Practice E1277), or other methods. In case of dispute, the results secured
by Practice E1277 shall be the basis of acceptance.
7.3.3 Method of Coating Material Analysis—Refer to Specification B750. In case of dispute, the results secured by Practice E1277
shall be the basis of acceptance.
8. Tensile Test
8.1 The Zn–5Al–MM alloy-coated steel core wire shall conform to the tensile and elongation requirements prescribed in Table
4 or Table 5 and a minimum breaking strength (lb [N]) calculated from the minimum required tensile and nominal wire diameter.
The wire tensile strength used to determine compliance to Table 4 or Table 5 shall be calculated using the actual wire breaking
strength and the nominal finished diameter of the wire.
8.2 Tensile tests shall be conducted in accordance with Test Methods and Definitions A370, using the initial settings for
determining stress at 1 % extension given in Table 6 or Table 7 of this specification.
8.3 Test Specimens—The test specimens shall be free of bends or kinks other than the curvature resulting from the usual coiling
operations. Any hand straightening necessary to permit insertion of the specimen in the jaws of the testing machine shall be
performed by drawing between wood blocks or by some other equally satisfactory means.
TABLE 3 Chemical Requirements
Element Composition, %
Carbon 0.50 to 0.88
Manganese 0.50 to 1.10
Phosphorus, max 0.035
Sulfur, max 0.045
Silicon 0.10 to 0.35
B802/B802M − 23
TABLE 4 Tensile Requirements
Stress at 1 % Extension, min, Ksi Ultimate Tensile Strength, min, Ksi Elongation in 10 in., min, %
Specified Diameter, in.
Class A Class C Class A Class C Class A Class C
0.0500 to 0.0899, incl 190 170 210 190 3.0 3.0
0.0900 to 0.1199, incl 185 165 205 185 3.5 3.0
0.1200 to 0.1399, incl 180 160 205 185 4.0 3.0
0.1400 to 0.1900, incl 170 155 200 180 4.0 4.0
TABLE 5 Tensile Requirements (Metric)
Ultimate Tensile Strength, min,
Stress at 1 % Extension, min, MPa Elongation in 250 mm, min, %
MPa
Specified Diameter, mm
Class A Class C Class A Class C Class A Class C
1.27 to 2.28, incl 1310 1170 1450 1310 3.0 3.0
2.29 to 3.04, incl 1280 1140 1410 1280 3.5 3.0
3.05 to 3.55, incl 1240 1100 1410 1280 4.0 3.0
3.56 to 4.82, incl 1170 1070 1380 1240 4.0 4.0
TABLE 6 Initial Settings for Determining Stress at 1 % Extension
Initial Stress, Initial Setting of Extensometer,
Specified Diameter, in.
Ksi in./in.
0.0500 to 0.0899, incl 14 0.0005 (0.05 % extension)
0.0900 to 0.1199, incl 28 0.0010 (0.10 % extension)
0.1200 to 0.1900, incl 42 0.0015 (0.15 % extension)
TABLE 7 Initial Settings for Determining Stress at 1 % Extension
(Metric)
Initial Stress, Initial Setting of Extensometer,
Specified Diameter, mm
MPa mm/mm
1.27 to 2.28, incl 100 0.0005 (0.05 % extension)
2.29 to 3.04, incl 190 0.0010 (0.10 % extension)
3.05 to 4.82, incl 290 0.0015 (0.15 % extension)
9. Wrap Test
9.1 The material, as represented by the test specimens, shall not fracture when the Zn–5Al–MM alloy-coated wire is wrapped at
a rate not exceeding 15 turns/min in a helix of at least eight turns around a cylindrical mandrel with a diameter equal to two times
the specified diameter of the wire under test, 65 %. The edge-to-
...