ASTM B86 - 13

    Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloy Foundry and Die Castings

    Active Standard ASTM B86 | Developed by Subcommittee: B02.04

    Book of Standards Volume: 02.04


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    Abstract

    This specification covers commercial zinc, zinc-aluminum castings and continuous cast bar stock. Seven alloy compositions are specified and designated: Alloy 3; Alloy 7; Alloy 5; Alloy 2; ZA-8; ZA-12; ZA-27. The metal used in the manufacture of die castings shall be zinc alloy of a specified chemical composition conforming to the requirements specified. Impact test and tension test shall be made to conform to the specified requirements.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This specification covers commercial zinc, zinc-aluminum castings and continuous cast bar stock, as designated and specified in Table 1. Seven alloy compositions are specified and designated as follows:

    Common

    Traditional

    ASTM A

    UNS

     

     

     

     

    Alloy 3

    Zamak 3

    AG 40A B

    Z33525

    Alloy 7

    Zamak 7

    AG 40B

    Z33527

    Alloy 5

    Zamak 5

    AC 41A B

    Z35533

    Alloy 2

    Zamak 2

    AC 43A

    Z35545

    ZA-8

    ZA-8

     ...

    Z35638

    ZA-12

    ZA-12

     ...

    Z35633

    ZA-27

    ZA-27

     ...

    Z35841

    A See Table 1, Footnote C.
    B SAE Specification, Nos. 903 and 925 conform to the requirements for alloys AG40A and AC41A, respectively.
    TABLE 1 Chemical Requirements

    Element

    Alloy 3A,B,C,D
    Zamak 3
    (AG40A)

    Alloy 7A ,B,C,D,E
    Zamak 7
    (AG40B)

    Alloy 5A,B,C,D
    Zamak 5
    (AC41A)

    Alloy 2A,C,,D
    Zamak 2
    (AC43A)

    ZA-8A,C,F
    ZA-8

    ZA-12A,C ,F
    ZA-12

    ZA-27A,C,F
    ZA-27

     

    (Z33525)

    (Z33527)

    (Z35533)

    (Z35545)

    (Z35638)

    (Z35633)

    (Z35841)

    Aluminum

    3.7-4.3

    3.7-4.3

    3.7-4.3

    3.7-4.3

    8.0-8.8

    10.5-11.5

    25.0-28.0

    Magnesium

    0.02-0.06G

    0.005-0.020

    0.02-0.06G

    0.02-0.06

    0.01-0.03

    0.01-0.03

    0.01-0.02

    Copper

    0.1 maxH

    0.1 maxE

    0.7-1.2

    2.6-3.3

    0.8-1.3

    0.5-1.2

    2.0-2.5

    Iron, max

    0.05

    0.05

    0.05

    0.05

    0.075

    0.075

    0.075

    Lead, max

    0.005

    0.003

    0.005

    0.005

    0.006

    0.006

    0.006

    Cadmium, max

    0.004

    0.002

    0.004

    0.004

    0.006

    0.006

    0.006

    Tin, max

    0.002

    0.001

    0.002

    0.002

    0.003

    0.003

    0.003

    Nickel

    . . .

    0.005-0.020

    . . .

    . . .

    . . .

    . . .

    . . .

    ZincI

    remainder

    remainder

    remainder

    remainder

    remainder

    remainder

    remainder

    A For purposes of acceptance and rejection, the observed value or calculated value obtained from analysis should be rounded to the nearest unit in the last right-hand place of figures, used in expressing the specified limit, in accordance with the rounding procedure prescribed in Practice E29.
    B Zinc alloy castings may contain nickel, chromium, silicon, and manganese in amounts of 0.02, 0.02, 0.035, and 0.06 %, respectively. No harmful effects have ever been noted due to the presence of these elements in these concentrations and, therefore, analyses are not required for these elements, with the exception of nickel analysis for Z33527.
    C ASTM alloy designations were established in accordance with Practice B275. The UNS designations were established in accordance with Practice E527. The last digit of a UNS number differentiates between alloys of similar composition. The UNS designations for ingot and casting versions of an alloy were not assigned in the same sequence for all alloys.
    D When this material is required to conform to ISO 301, the chemical limits for thallium and indium each shall not exceed 0.001 %.
    E For the majority of commercial applications, a copper content up to 0.25 % will not adversely affect the serviceability of these die castings and should not serve as a basis for rejection, unless otherwise specified in the contract or purchase order between the producer and user.
    F Zinc-aluminum ingot for foundry and pressure die casting may contain chrome, manganese, or nickel in amounts of up to 0.01 % each or 0.03 % total. No harmful effects have ever been noted due to the presence of these elements in up to these concentrations and, therefore, analyses are not required for these elements.
    G Magnesium may be as low as 0.015 % provided that the lead, cadmium, and tin do not exceed 0.003, 0.003, and 0.001 %, respectively.
    H For the majority of commercial applications, a copper content of up to 0.7 % will not adversely affect the serviceability of die castings and should not serve as a basis for rejection, unless otherwise specified in the contract or purchase order between the producer and user, such as to meet the requirements of ISO 15201.
    I Determined arithmetically by difference.

    1.2 Zinc Alloys Z33525, Z33527, Z35533, and Z35545 are used primarily in the manufacture of pressure die castings. Zinc-Aluminum Alloys Z35638, Z35633, and Z35841 are used in the manufacture of both foundry and pressure die castings. These alloys are also fabricated into continuous cast bar stock used for prototyping and screw machine stock.

    1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.4 Systems of nomenclature used to designate zinc and zinc-aluminum (ZA) alloys used for casting are described in Appendix X1.

    1.5 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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    B240 Specification for Zinc and Zinc-Aluminum (ZA) Alloys in Ingot Form for Foundry and Die Castings

    B275 Practice for Codification of Certain Nonferrous Metals and Alloys, Cast and Wrought

    B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products

    B899 Terminology Relating to Non-ferrous Metals and Alloys

    B949 Specification for General Requirements for Zinc and Zinc Alloy Products

    E8 Test Methods for Tension Testing of Metallic Materials

    E23 Test Methods for Notched Bar Impact Testing of Metallic Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical Composition

    E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

    E536 Test Methods for Chemical Analysis of Zinc and Zinc Alloys

    E634 Practice for Sampling of Zinc and Zinc Alloys by Spark Atomic Emission Spectrometry

    Federal Standard

    Fed.Std.No.123 Marking for Shipment (Civil Agencies)

    Military Standard

    MIL-STD-129 Marking for Shipment and Storage (Military Agencies)

    Military Specification

    MIL-P-116 Methods of Preservation


    ICS Code

    ICS Number Code 77.150.60 (Lead, zinc and tin products)

    UNSPSC Code

    UNSPSC Code 11101719(Zinc)


    DOI: 10.1520/B0086-13

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