ISO 16220:2017

SLOVENSKI STANDARD
SIST ISO 16220:2021
01-julij-2021
Nadomešča:
SIST ISO 16220:2005
Magnezij in magnezijeve zlitine - Ingoti magnezijevih zlitin in ulitki
Magnesium and magnesium alloys -- Magnesium alloy ingots and castings
Magnésium et alliages de magnésium -- Lingots et pièces moulées en alliage de
magnésium
Ta slovenski standard je istoveten z: ISO 16220:2017
ICS:
77.120.20 Magnezij in magnezijeve Magnesium and magnesium
zlitine alloys
77.150.20 Magnezijevi izdelki Magnesium products
SIST ISO 16220:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 16220:2021

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SIST ISO 16220:2021
INTERNATIONAL ISO
STANDARD 16220
Third edition
2017-04
Magnesium and magnesium alloys —
Magnesium alloy ingots and castings
Magnésium et alliages de magnésium — Lingots et pièces moulées en
alliage de magnésium
Reference number
ISO 16220:2017(E)
©
ISO 2017

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SIST ISO 16220:2021
ISO 16220:2017(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

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Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Material designation . 1
4.1 General . 1
4.2 Temper designation . 1
4.3 Casting process designation . 2
4.4 Designation for ordering . 2
5 Requirements . 2
5.1 Chemical composition . 2
5.2 Mechanical properties of castings . 2
5.3 Frequency of testing . 3
5.4 General condition of the product . 3
6 Sampling . 3
7 Test pieces for mechanical properties . 3
7.1 Design . 3
7.2 Test pieces obtained from separately cast samples . 3
7.2.1 Sand-cast samples . 3
7.2.2 Permanent-mould cast samples . 3
7.2.3 Pressure-die cast samples . 3
7.2.4 Investment cast samples . 4
7.3 Test pieces cut from castings . 4
8 Test methods . 4
8.1 Tensile test . 4
8.2 Brinell hardness test . 4
9 Retests . 4
10 Rounding of numbers . 4
Annex A (informative) List of ISO and equivalent international alloy designations .14
Annex B (informative) Additional information regarding the manganese and iron content .16
Annex C (informative) Additional information regarding maximum content of alloying
elements and impurities in ingots and castings .17
Bibliography .18
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www. iso. org/d irectives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www. iso. org/p atents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o. org/i so/f oreword. html.
This document was prepared by Technical Committee ISO/TC 79, Light metals and their alloys,
Subcommittee SC 5, Magnesium and alloys of cast or wrought magnesium.
This third edition cancels and replaces the second edition (ISO 16220:2005), which has been technically
revised by the addition of new alloys. It also incorporates the amendment ISO 16220:2005/Amd.1:2007.
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Introduction
This document classifies the magnesium alloys into a number of grades suitable for the applications to
which they might be used.
Some of the alloys referenced in this document can be the subject of a patent or of patent applications and
their listing herein is not to be construed in any way as the granting of a licence under such patent rights.
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SIST ISO 16220:2021
INTERNATIONAL STANDARD ISO 16220:2017(E)
Magnesium and magnesium alloys — Magnesium alloy
ingots and castings
1 Scope
This document specifies the chemical composition of magnesium alloy ingots and castings. It also
specifies the mechanical properties of separately cast samples of these alloys (see Clause 7). By
agreement, it also specifies the mechanical properties of magnesium alloy castings determined from
samples cut from a casting.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE For information on equivalent International Standards see Annex A.
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 80000-1:2009, Quantities and units — Part 1: General
EN 1559-5, Founding — Technical condition of delivery — Part 5: Additional requirements for magnesium
alloy castings
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Material designation
4.1 General
The material shall be designated as given in Tables 1 to 5.
4.2 Temper designation
The following symbols for temper designation shall be used.
— F: as-cast; applies to products that require no heat treatment following the casting processes.
— T4: solution heat-treated and naturally aged; applies to products that have no further treatment
after solution heat treatment.
— T5: as-cast and artificially aged; applies to products that are cooled from the casting process, and
then artificially aged to improve mechanical properties or dimensions.
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— T6: solution heat-treated and artificially aged; applies to products that are solution heat treated
followed by artificially aging.
4.3 Casting process designation
The following symbols shall be used for the designation of the different casting processes.
— S: sand casting.
— K: permanent mould casting.
— D: pressure die casting.
— L: investment casting.
4.4 Designation for ordering
The designation used for ordering shall include, in the following order, the number of castings, a
mention of this document, the ISO alloy designation, the designation for the heat treatment process
(temper), and the designation for the casting process.
EXAMPLE An order for 20 castings, conforming to this document, of magnesium alloy ISO-MC21120,
delivered in as-cast (F temper) and made by sand casting (S) is as follows:
20 castings – ISO 16220 - ISO-MgAl9Zn1(A) (or ISO-MC21120 or ISO-AZ91D)-F-S
5 Requirements
5.1 Chemical composition
The chemical composition of magnesium alloy ingots shall conform to the requirements for the
appropriate material given in Table 1.
The chemical composition of magnesium alloy castings shall conform to the requirements for the
appropriate material given in Table 2.
Conformance shall be determined by the manufacturer by analysing samples taken at the time the
ingots or castings are produced.
NOTE For additional information regarding the manganese and iron contents see Annex B.
5.2 Mechanical properties of castings
The mechanical properties obtained from test pieces prepared from separately cast samples for
sand castings and permanent mould castings shall meet the requirements given in Tables 3 and 4. As
appropriate, the tests shall be carried out in accordance with Clause 8.
NOTE 1 Mechanical properties obtained from test pieces prepared from separately cast samples for
investment castings are not specified, as experience is limited. As a general rule they are similar to those for
permanent mould castings.
NOTE 2 The values obtained from test pieces cut from castings can differ from the minimum values specified
in the tables because of imperfections (gas pores, shrinkage cavities, inclusions) and the machining process
applied. Variation in the casting structure can also affect the property values.
NOTE 3 For pressure-die castings, the mechanical properties strongly depend on the process parameters;
therefore, the properties given in Table 5 are for guidance only.
The Brinell hardness test shall be carried out on sound areas of castings or on a test piece that has not
been stressed. Hardness tests are only to be carried out where appropriate and when there is a real
difference between the different states of heat treatment.
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5.3 Frequency of testing
The frequency of testing shall be in accordance with EN 1559-5.
5.4 General condition of the product
Ingots shall be free of dust, burrs, salty inclusions and be homogeneous in thickness and weight to a
standard agreed with the purchaser.
Castings shall have a clean surface and shall be free from visible and internal imperfections to a
standard also agreed between the manufacturer and the purchaser.
6 Sampling
Conditions for sampling, formation of batches and frequency of verification shall be as specified in
EN 1559-5.
7 Test pieces for mechanical properties
7.1 Design
The design of test pieces shall be subject to an agreement between the manufacturer and the purchaser.
7.2 Test pieces obtained from separately cast samples
7.2.1 Sand-cast samples
Test pieces may be in the machined or unmachined condition.
The following conditions shall apply:
— samples shall be cast in sand moulds and without artificial chilling;
— the minimum diameter of the test piece shall be 12 mm;
— the gauge length and the parallel length shall conform to ISO 6892-1.
7.2.2 Permanent-mould cast samples
Test pieces may be in the machined or unmachined condition.
The following conditions shall apply:
— the minimum diameter of the test piece shall be 12 mm;
— the gauge length and parallel length shall conform to ISO 6892-1.
7.2.3 Pressure-die cast samples
For pressure die castings, it is not recommended to test mechanical properties on separately cast bars
or coupons. It is more appropriate to test the whole casting under conditions comparable to the ones
expected in service.
The values given in Table 5 are for guidance only. These are not typical, but they are the minimum
values that can be expected on separately pressure cast bars (with none or very limited machining) and
2
with a cross section of 20 mm and a typical thickness of 2 mm.
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7.2.4 Investment cast samples
Test pieces may be in the machined or unmachined condition.
The following conditions shall apply:
— the minimum diameter of the test piece shall be 5 mm;
— the gauge length and parallel length shall conform to ISO 6892-1.
7.3 Test pieces cut from castings
The geometry and location of test pieces cut from castings shall be specified by agreement between the
manufacturer and the purchaser.
If it is agreed between the manufacturer and the purchaser to use circular cross-section test pieces, the
minimum diameter shall be 4 mm.
8 Test methods
8.1 Tensile test
Tensile tests shall be carried out in accordance with ISO 6892-1.
8.2 Brinell hardness test
Brinell hardness tests shall be carried out in accordance with ISO 6506-1.
A test ball of 5 mm diameter is recommended. By agreement between the manufacturer and the
purchaser, a smaller ball diameter may be used for thin-wall castings.
9 Retests
Retests shall be carried out in accordance with EN 1559-5.
10 Rounding of numbers
The number representing the result for any value specified in this document shall be expressed with
the same number of decimal places as the corresponding number in this document. The rounding of
numbers shall meet the requirements of ISO 80000-1:2009, B.3, rule A or B. The choice shall be left to
the discretion of the manufacturer, unless the use of one of the rules is agreed by the time of acceptance
of the order.
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Table 1 — Chemical composition of magnesium alloy ingots
Material designation Composition % mass fraction
Alloy
ASTM Min.
Designation by Designation Other
group
a b
desig- or Mg Al Zn Mn RE Zr Ag Y Gd Li Sr Ca Si Fe Cu Ni
symbols by numbers each
nation max.
ISO- min. 7,2 0,45 0,17 – – – – –
ISO-MgAl8Zn1 AZ81 Rem.
MB21110 max. 8,5 0,9 0,4 0,05 0,004 0,025 0,001 0,05
ISO- ISO- min. 8,5 0,45 0,17 – – – – –
AZ91 Rem.
MgAl9Zn1(A) MB21120 max. 9,5 0,9 0,40 0,08 0,004 0,025 0,001 0,01
ISO- ISO- min. 8,0 0,3 0,1 – – – – –
AZ91 Rem.
MgAlZn
MgAl9Zn1(B) MB21121 max. 10,0 1,0 0,50 0,3 0,03 0,020 0,01 0,05
min 8,5 0,45 0,17 0,5 – – – – –
ISO-MgAl9Zn- ISO-
AZ91 Rem.
1Ca MB21122
max 9,5 0,9 0,40 2,5 0,08 0,004 0,025 0,001 0,01
ISO- min. 5,5 2,7 0,15 – – – – –
ISO-MgAl6Zn3 AZ63 Rem.
MB21130 max. 6,5 3,3 0,35 0,05 0,005 0,015 0,001 0,05
ISO- min. 1,7 – 0,35 – – – – –
ISO-MgAl2Mn AM20 Rem.
MB212
...