ISO 23694:2021

INTERNATIONAL ISO
STANDARD 23694
First edition
2021-01
Wrought magnesium and magnesium
alloys — Extruded rods/bars and tubes
Reference number
©
ISO 2021
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Orders or tenders . 2
5 Requirements . 2
5.1 Designation . 2
5.2 Production and manufacturing processes . 3
5.3 Quality control . 3
5.4 Chemical composition . 3
5.5 Dimensional tolerances . 5
5.5.1 The dimensions and tolerances for extruded round, square and hexagonal bars . 5
5.5.2 The dimensions and tolerances for extruded tubes . 7
5.6 Mechanical properties . 9
5.7 Surface finish .10
6 Test procedure .10
6.1 Sampling .10
6.1.1 Specimens for chemical analysis .10
6.1.2 Specimens for mechanical testing .10
6.1.3 Test pieces for tensile test .11
6.2 Test methods .12
6.2.1 Chemical composition .12
6.2.2 Tensile test .12
6.2.3 Surface finish .12
6.2.4 Measurement of dimensions .12
6.2.5 Additional tests .12
6.3 Retests .12
6.3.1 Mechanical properties .12
6.3.2 Other properties .12
6.4 Test report .13
7 Marking .13
8 Packing.13
9 Transportation and storage .13
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/ directives).
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/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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 www .iso .org/
iso/ foreword .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.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved

Introduction
This document classifies the commercially available magnesium and magnesium alloy extruded rods/
bars and tubes into a number of grades suitable for the application to which they might be put.
INTERNATIONAL STANDARD ISO 23694:2021(E)
Wrought magnesium and magnesium alloys — Extruded
rods/bars and tubes
1 Scope
This document specifies the technical conditions for inspection and delivery of wrought magnesium
and magnesium alloy rods/bars and tubes for general engineering applications.
It is applicable to wrought magnesium and magnesium alloy extruded round, square and hexagonal
rods/bars and seamless round tubes (hereafter referred to as “tubes”).
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.
ISO 3116:2019, Magnesium and magnesium alloys — Wrought magnesium and magnesium alloys
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
rod/bar
solid wrought product of uniform cross-section along its whole length, supplied in straight lengths
Note 1 to entry: The cross-sections are in the shape of circles, squares, rectangles or regular hexagons. Products
with a square, rectangular or hexagonal cross-section can have corners rounded along their whole length.
Note 2 to entry: A rod is normally less than 6 mm in diameter or minor dimension. In North America, the
minimum diameter of a rod is 9,525 mm (0,375 in). Below this limit, the product is called “wire”.
Note 3 to entry: For rectangular bars, the thickness exceeds one-tenth of the width. The term “rectangular bar”
includes “flattened circles” and “modified rectangles”, of which two opposite sides are convex arcs, the other two
sides being straight, of equal length and parallel.
3.2
tube
hollow wrought product of uniform cross-section with only one enclosed void along its whole length,
and with a uniform wall thickness, supplied in straight lengths or in coiled form, provided the inner and
outer cross-sections are concentric and have the same form and orientation
Note 1 to entry: The cross-sections are in the shape of circles, squares, rectangles or regular hexagons. Hollow
products with square, rectangular or regular hexagonal cross-sections can have corners rounded along their
whole length.
3.3
sample
quantity of molten metal, product or products which is used for the production of specimens (3.4)
3.4
specimen
one or more pieces taken from each product in the sample (3.3) for the purpose of producing test
pieces (3.5)
3.5
test piece
piece taken from each specimen (3.4) and suitably prepared for a test (3.6)
3.6
test
operation to which the test piece (3.5) is subjected in order to measure or classify properties
4 Orders or tenders
The order or tender shall define the product required and shall contain the following details:
a) the type and form of the product:
1) the designation of the magnesium or magnesium alloy;
2) the form of the product (sheet, plate, etc.);
b) the metallurgical temper (degree of hardness or heat treatment condition) of the material for
delivery and, if different, the metallurgical temper for use;
c) the number of this document, i.e. ISO 23694, the specification number or, where none exists, the
properties agreed between the supplier and the purchaser;
d) the dimensions and shape of the product (thickness, width, length, diameter of the coil);
e) the tolerances of the dimensions and form, with reference to the appropriate clause or subclause of
this document;
f) the quantity;
g) any requirements for certificates of conformity, test and/or analysis;
h) any special requirements agreed between the supplier and the purchaser (e.g. drawings).
5 Requirements
5.1 Designation
The alloy designation and temper shall be in accordance with Table 1. If the alloy to be used is not
specified in Table 1, the alloy designation and temper shall be in accordance with ISO 3116:2019 or be
agreed upon between the supplier and purchaser and stated in the order.
2 © ISO 2021 – All rights reserved

Table 1 — Alloy designation and temper
Alloy symbol Alloy designation Temper Product type Diameter or thickness
mm
ISO-MgAl4Zn MAZ40 H112, F rods/bars D ≤ 130
ISO-MgMn2(A) MM2a H112, F rods/bars D ≤ 130
ISO-MgZn6Zr(A) MZK60a T5 rods/bars D ≤ 130
ISO-MgGd7Y5RE1 MVWE751 T5 bars D ≤ 160
ISO-MgGd9Y2Nd1Zr MVW92 H112, T5, T6 bars D ≤ 50
ISO-MgGd8Y2ZrAgEr MVW93M T5 bars D ≤ 160
H112 bars D ≤ 160
ISO-MgGd9Y4Zn1Zr MVW94M
T5 bars D ≤ 80
5.2 Production and manufacturing processes
Unless otherwise specified in the order, the production and manufacturing processes shall be left to
the discretion of the producer. Unless it is explicitly stated otherwise in the order, no obligation shall be
placed on the producer to use the same processes for subsequent and similar orders.
5.3 Quality control
The supplier shall be responsible for the performances of all inspection and tests required by the
relevant International Standard, specification or customer requests, prior to shipment of the product.
If the purchaser wishes to inspect the product at the supplier’s works, he or she shall notify the supplier
at the time of placing the order.
5.4 Chemical composition
The chemical composition of ISO-MgAl4Zn, ISO-MgMn2(A), ISO-MgZn6Zr(A), ISO-MgGd9Y2Nd1Zr, ISO-
MgGd8Y2ZrAgEr and ISO-MgGd9Y4Zn1Zr shall conform to the requirements specified in Table 2. The
chemical composition of other alloys shall conform to the requirements specified in ISO 3116:2019. If
the purchaser requires content limits for elements not specified in ISO 3116:2019, these limits shall be
stated in the order document.
4 © ISO 2021 – All rights reserved
Table 2 — Chemical composition of ISO-MgAl4Zn, ISO
...