Determination of percentage of resolvable pearlite in high carbon steel wire rod

ISO 16574:2015 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.

Détermination du pourcentage de perlite résoluble dans les fils machine en acier à haut carbone

General Information

Status
Published
Publication Date
17-Sep-2015
Current Stage
9093 - International Standard confirmed
Start Date
10-Mar-2021
Completion Date
10-Mar-2021
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ISO 16574:2015 - Determination of percentage of resolvable pearlite in high carbon steel wire rod
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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

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ii © ISO 2015 – All rights reserved
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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
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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

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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
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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
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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
...

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