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© ISO 2017 Non destructive testing — Ultrasonic testing — Specification for step wedge calibration block Essais non destructifs — Essais par ultrasons — Spécifications relatives aux blocs d’étalonnage[.]
INTERNATIONAL STANDARD ISO 16946 Second edition 2017-03 Non-destructive testing — Ultrasonic testing — Specification for step wedge calibration block Essais non destructifs — Essais par ultrasons — Spécifications relatives aux blocs d’étalonnage gradins Reference number ISO 16946:2017(E) © ISO 2017 ISO 16946:2017(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2017, Published in Switzerland All rights reserved Unless otherwise specified, no part o f 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 o f the requester ISO copyright o ffice Ch de Blandonnet • 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 ISO 16946:2017(E) Contents Page iv Introduction v Scope Normative re ferences Terms and definitions Dimensions Alternative dimensions Material Preparation Marking Declaration o f formity Bibliography Foreword © ISO 2017 – All rights reserved iii ISO 6946: 01 7(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work o f 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 o f electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part In particular the different approval criteria needed for the di fferent types o f ISO documents should be noted This document was dra fted in accordance with the editorial rules of the ISO/IEC Directives, Part (see www.iso org/directives) Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f patent rights ISO shall not be held responsible for identi fying any or all such patent rights Details o f any patent rights identified during the development o f 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 in formation given for the convenience o f users and does not constitute an endorsement For an explanation on the voluntary nature o f standards, the meaning o f ISO specific terms and expressions related to formity assessment, as well as in formation about ISO’s adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso org/iso/foreword html This document was prepared by Technical Committee ISO/TC 135, Non-destructive testing, Subcommittee SC 3, Ultrasonic testing This second edition cancels and replaces the first edition (ISO 16946:2015), o f which it constitutes a minor revision with the following changes: a) the normative reference s have been updated; b) Figure has been updated in respect of the tolerances for length and width iv © ISO 2017 – All rights reserved ISO 16946:2017(E) Introduction A step wedge calibration block is not meant to check an ultrasonic instrument A step wedge calibration blo ck ma ke s it p o s s ible, duri ng prac tic a l te s ti ng , to che ck s i mply, from ti me to ti me , the s e tti ng o f the ti me b as e a nd the s en s itivity o f the u ltra s onic e qu ipment C a l ibration blo ck No i s s p e c i fie d i n I S O 0 C a l ibration blo ck No i s s p e c i fie d i n I S O 79 Re que s ts for o ffici a l i nterpre tation s o f a ny a s p e c t o f th i s c u ment are to b e d i re c te d to the S e c re tari at o f I S O/ TC 5/S C via you r nationa l s tandard s b o dy, a comple te l i s ti ng o f wh ich c an b e iso org © ISO 2017 – All rights reserved fou nd at www v INTERNATIONAL STANDARD ISO 16946:2017(E) Non-destructive testing — Ultrasonic testing — Specification for step wedge calibration block Scope T h i s c u ment s p e ci fie s the d i men s ion s , materia l, and ma nu fac tu re o f a s tep we dge s te el blo ck calibration of ultrasonic instruments T he for the Normative re ferences fol lowi ng c u ments are re ferre d to i n the tex t i n s uch a way th at s ome or a l l o f thei r content s titute s re qu i rements o f th i s c u ment For date d re ference s , on ly the e d ition cite d appl ie s For u ndate d re ference s , the late s t e d ition o f the re ference d c ument (i nclud i ng a ny amend ments) appl ie s I S O 5 7, Non-destructive testing — Ultrasonic inspection — Vocabulary EN 1330-4, Non-destructive testing — Terminology — Part 4: Terms used in ultrasonic testing E N 10 02 -2 , Hot rolled products of structural steels — Part 2: Technical delivery conditions for non-alloy structural steels Terms and definitions For the pu r p o s e s o f th i s c u ment, the term s and defi nition s given i n I S O 5 7 a nd E N 3 - apply 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 Dimensions The dimensions of the block are given in Figure T he tolera nce s a re ± ,1 mm for the leng th and the width o f the blo ck a nd − , thickness All external surfaces shall be machined to an Ra value not greater than 0,8 µm © ISO 2017 – All rights reserved mm for the s tep ISO 16946:2017(E) Dimensions in millimetres Key manufacturer’s trademark International Standard number, serial number Figure — Step wedge calibration block Alternative dimensions In the event of a different size of calibration block being required which is not described in this document, the principles embodied in the design and manufacture of a calibration block to the requirements of this document shall be applied to such a block T he tolerance s are ± ,1 mm for the leng th and the width o f the blo ck and − , 02 th ickne s s up to , m m a nd − ,1 m m for mm for the s tep larger th ickne s s Material T he c a l ibration blo ck sha l l b e made an equivalent steel grade from s te el o f grade S 5 J0 i n accorda nce with E N 10 02 -2 or from Preparation Blocks shall be rough-machined to a plan parallel plate which is at least mm larger at all sides than the d i men s ion s o f the fi na l i ze d s tep blo ck I n order to ob tai n a fi ne gra i n s tr uc tu re and go o d homo geneity, the blo ck s l l b e he at tre ate d as follows: a) maintain at 920 °C for 30 min; b) rapid cooling (quenching) in water; c) temp eri ng b y he ati ng to ° C for at le a s t h; d) cooling in still air © ISO 2017 – All rights reserved ISO 16946:2017(E) After heat treatment, at least mm shall be removed from all surfaces P rior to fi na l mach i n i ng , the blo ck sh a l l u ndergo u ltra s on ic te s ti ng to prove that the blo ck i s fre e from internal discontinuities For this purpose, an ultrasonic test shall be performed with a longitudinal wave normal-beam probe f f f block shall be checked from at least two long surfaces to cover the complete volume The following two o at le a s t 10 M H z nom i na l centre re quenc y and havi ng a tran s ducer s i z e o 10 m m to m m T he accep ta nce criteri a apply: 1) with the probe scanning as shown in Figure , the noi s e level pro duce d by the gra i n s truc tu re sha l l a lways b e at le a s t dB lower than the ampl itude o f the 2) no e cho ari s i ng from fou r th b ack wa l l e cho; any d i s conti nu ity i n the materi a l sha l l have a n a mp l itude gre ater tha n the grain scatter noise level Figure — Scan pattern T he velo city o f longitud i na l wave s s l l b e veri fie d a s b ei ng m/s ± m/s Marking T he b lo ck s l l b e p ermanently ma rke d with a) the manufacturer’s trademark, b) the number of this document, i.e ISO 16946, and c) a unique serial number Declaration o f formity For e ach blo ck, a de claration sh a l l b e i s s ue d b y the ma nu fac tu rer s tati ng a) that the block complies with this document, and b) the mean value of the measured longitudinal wave velocities, vl © ISO 2017 – All rights reserved ISO 6946: 01 7(E) Bibliography [1 ] [2 ] ISO 2400, Non-destructive testing — Ultrasonic testing — Specification for calibration block No ISO 4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters [3 ] [4] ISO 7963, Non-destructive testing — Ultrasonic testing — Specification for calibration block No ISO 16809, Non-destructive testing — Ultrasonic thickness measurement © ISO 2017 – All rights reserved ISO 6946: 01 7(E) ICS 19.100 Price based on pages © ISO 2017 – All rights reserved