ISO INTERNATIONAL STANDARD 18203 Firstedition 2016-12-01 Steel Determination of the thickness of surface-hardened layers Acier-Détermination deI'épaisseur des couches durcies superficielles Referencenumber IS018203:2016(E) ISO Intemational Organization for Standardization @IS02016 itted without license from IHS IS0 18203:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,Published inSwitzerland 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. ISOcopyrightoffice Ch. de Blandonnet 8. CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +4122 749 09 47 [email protected] www.iso.org Intemationaibr PrganizationforStandardization networking permited without license from IHS IS018203:2016(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative reference ..1 3 Terms and definitions .1 4 Symbols, abbreviations and designations ..3 5 Principle .3 6 Apparatus ..3 7 Test specimen .4 7.1 Selection and preparation of samples. .4 7.2 Preparationofthesurfacetobeexamined .5 8 Method ofmeasurement. .5 8.1 Hardness testing method .5 8.2 Microscopic methods.. .6 8.2.1 Total thickness of surface hardening depth (THD) .6 8.2.2 Compound layer thickness (CLT) .6 9 Evaluationoftheresults 7 9.1 Case hardening depth (CHD), surface hardening depth (SHD) and nitriding hardness depth (NHD) .57 9.2 Total thickness of surface hardening depth (THD) > 9.3 Compound layer thickness (CLT) 7 10 Test report ..8 Annex A (normative) Interpolation methodfor determining thecasehardening depth AnnexB (informative)ExamplesofCLTmeasurements ..11 Bibliography .12 iii lout license from IHS