ISO 16574:2015

INTERNATIONAL ISO
STANDARD 16574
First edition
2015-09-15
Determination of percentage of
resolvable pearlite in high carbon
steel wire rod
Détermination du pourcentage de perlite résoluble dans les fils
machine en acier à haut carbone
Reference number
ISO 16574:2015(E)
©
ISO 2015

---------------------- Page: 1 ----------------------
ISO 16574:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, 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 2015 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 16574:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 1
5 Principle . 2
6 Selection and preparation of samples . 2
6.1 Test location . 2
6.2 Grinding and polishing . 2
6.3 Etching . 2
7 Evaluation of the percentage of resolvable pearlite . 3
7.1 Parameters of optical microscope . 3
7.2 Determination of measuring field of view. 3
7.2.1 Determination of measuring locations . 3
7.3 Measuring methods . 4
7.3.1 Manual point count method . 4
7.3.2 Automatic image analysis method . 4
7.4 Reporting of results . 4
Bibliography . 5
© ISO 2015 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 16574:2015(E)

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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 7, Methods of testing
(other than mechanical tests and chemical analysis).
iv © ISO 2015 – All rights reserved

---------------------- Page: 4 ----------------------
ISO 16574:2015(E)

Introduction
This test method produces an estimate of the percentage of pearlite resolvable at 500x magnification
in wire rod as a function of the cooling method after hot rolling to rod. The drawability of high-carbon
pearlitic rod is influenced by the amount of resolvable pearlite present. As the percentage of resolvable
pearlite increases, drawability decreases. The methods are used to check if the content of resolvable
pearlite can fulfil the requirement of the wire rod with improved characteristics intended for drawing.
© ISO 2015 – All rights reserved v

---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 16574:2015(E)
Determination of percentage of resolvable pearlite in
high carbon steel wire rod
1 Scope
This International Standard defines resolvable pearlite and specifies two methods of determining the
percentage of resolvable pearlite.
The methods are applicable for wire rod made from control cooling steel with carbon content greater
than 0,65 % C.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
ind
...