ASTM B750-99e1
(Specification)Standard Specification for Zinc-5% Aluminum-Mischmetal Alloy in Ingot Form for Hot-Dip Coatings
Standard Specification for Zinc-5% Aluminum-Mischmetal Alloy in Ingot Form for Hot-Dip Coatings
SCOPE
1.1 This specification covers zinc-5 % aluminum-mischmetal (Zn-5Al-MM) alloy (UNS Z38510) in ingot form for remelting for use in the production of hot-dip coatings on steel. Alloy composition is specified in .
1.2 The values stated in inch-pound units are to be regarded as the standard. The values stated in parentheses are for information only.
1.3 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 Data Sheet 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.
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e1
Designation: B 750 – 99
Standard Specification for
Zinc-5 % Aluminum-Mischmetal Alloy in Ingot Form for Hot-
Dip Coatings
This standard is issued under the fixed designation B 750; 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 (e) indicates an editorial change since the last revision or reapproval.
e NOTE—The caveat in section 1.3 and section 3. Terminology were added editorially in December 2000.
A ,B,C,D,E
TABLE 1 Zn-5A1-MM Alloy Ingot Chemical Requirements
1. Scope *
UNS Z38510
1.1 This specification covers zinc-5 % aluminum-
Element
Composition,%
mischmetal (Zn-5Al-MM) alloy (UNS Z38510) in ingot form
F
Aluminum 4.2–6.2
for remelting for use in the production of hot-dip coatings on
Cerium + lanthanum, total 0.03–0.10
steel. Alloy composition is specified in Table 1.
Iron, max 0.075
Silicon, max 0.015
1.2 The values stated in inch-pound units are to be regarded
G
Lead , max 0.005
as the standard. The values stated in parentheses are for
G
Cadmium , max 0.005
G
information only.
Tin , max 0.002
H
Others , each, max 0.02
1.3 This standard does not purport to address all of the
H
Others , total, max 0.04
safety concerns, if any, associated with its use. It is the
Zinc Remainder
responsibility of the user of this standard to become familiar
A
For purposes of acceptance and rejection, the observed value or calculated
with all hazards including those identified in the appropriate
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
Material Data Sheet for this product/material as provided by
with the rounding procedure prescribed in Section 3 of Practice E 29.
the manufacturer, to establish appropriate safety and health
B
By agreement between purchaser and supplier, analysis may be required and
practices, and determine the applicability of regulatory limi-
limits established for elements or compounds not specified in the table of chemical
composition.
tations prior to use.
C
Zn-5AI-MM alloy ingot for hot-dip coatings may contain antimony, copper, and
magnesium in amounts of up to 0.002, 0.1, and 0.05 %, respectively. No harmful
2. Referenced Documents
effects have ever been noted due to the presence of these elements up to these
concentrations and, therefore, analyses are not required for these elements.
2.1 ASTM Standards:
D
Magnesium may be specified by the buyer up to 0.1 % maximum.
B 899 Terminology Relating to Non-ferrous Metals and
E
Zirconium and titanium may each be specified by the buyer up to 0.02 %
Alloys
maximum.
F
Aluminum may be specified by the buyer up to 8.2 % maximum.
E 29 Practice for Using Significant Digits in Test Data to
G
Lead and cadmium, and to a lesser extent tin and antimony, are known to
Determine Conformance with Specifications
cause intergranular corrosion in zinc-aluminum alloys. For this reason it is
E 47 Test Methods for Chemical Analysis of Zinc Die-
important to maintain the levels of these elements below the limits specified.
H
Except antimony, copper, magnesium, zirconium, and titanium.
Casting Alloys
E 88 Practice for Sampling Nonferrous Metals and Alloys
in Cast Form for Determination of Chemical Composition
2.2 Other Standard:
E 527 Practice for Numbering Metals and Alloys (UNS) GF-1 Standard Practice for Determination of Cerium and
E 1277 Test Method for Chemical Analysis of Zinc–5 %
Lanthanum Compositions in Galfan Alloy (5% -0.04%
Aluminum–Mischmetal Alloy by the ICP Argon Plasma La-0.04% Ce-Bal SHG Zn)
Spectrometric Method
3. Terminology
3.1 Terms shall be defined in accordance with Terminology
This specification is under the jurisdiction of ASTM Committee B-2 on
B 899.
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
3.2 Definitions of Terms Specific to This Standard:
B02.04 on Zinc and Cadmium.
3.2.1 mischmetal—a naturally occuring mixture of rare-
Current edition approved May 10, 1999. Published June 1999. Originally
published as B 750 – 85. Last previous edition B 750 – 94a.
earth elements in metallic form, primarily cerium and lantha-
UNS number in conformance with Practice E 527.
num.
Annual Book of ASTM Standards, Vol 02.04.
Annual Book of ASTM Standards, Vol 14.02.
Annual Book of ASTM Standards, Vol 03.05.
6 8
Annual Book of ASTM Standards, Vol 01.01. Available from International Lead Zinc Research Organization, 2525 Meridian
Annual Book of ASTM Standards, Vol 03.06. Parkway, P.O. Box 12036, Research Triangle Park, NC 27709 – 2036.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
B 750
3.3 Abbreviations: long side to the other. Each cut shall be approximately half way
3.3.1 MM—mischmetal. between the center and each end. The width of the saw cut shall
3.3.2 Zn-5A1-MM—zinc-5 % aluminum mischmetal. be sufficient to give the weight of sample prescribed in 7.1.5,
and cuttings from all the ingots shall be mixed thoroughly to
4. Ordering Information
form a uniform sample.
4.1 Orders for ingot under this specification shall include 7.1.5 Size of Sample and Storage—The prepared sample
the following information:
shall weigh at least 300 g. The properly mixed sample shall be
4.1.1 Quantity in pounds, split into three equal parts, each of which shall be placed in a
4.1.2 Alloy (Table 1),
sealed package, one for the manufacturer, one for the pur-
4.1.3 Size, if not manufacturer’s standard, chaser, and one for a referee, if necessary. Tight, leakproof,
4.1.4 Specification number and year of issue,
paper sample envelopes or cardboard cartons may be used to
4.1.5 Inspection (Section 9), and hold the sample.
4.1.6 Product marking (Section 12).
7.2 If the alloy is in shapes other than standard ingots, the
sampling procedure shall be agreed upon between the manu-
5. Materials and Manufacture
facturer or seller and the purchaser.
5.1 The alloys may be made by any approved process.
7.3 An optimal method of sampling for analysis may be by
5.2 The material covered by this specification shall be free
melting together representative portions of each ingot selected,
from dross, slag, or other harmful contamination.
and then sampling the liquid composite by casting suitable
specimens for either spectrographic or chemical analysis.
6. Chemical Composition
7.4 Samples for Spectrochemical and Other Methods of
6.1 Limits—The alloys shall conform to the requirements as
A
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