TECHNICAL ISO/TR REPORT 21704 First edition 2017-02 Toughness of round steel link chains Test with sub-size specimens Ténacité de la chaines en acier rond -Essai avec les éprouvettes sous-dimensionnees Reference number ISO/TR21704:2017(E) International Organization for Standardization =ZHEJIANG INSTOF STANDARDIZATION C1 5956617 @ IS0 2017 vided by IHS underI itted without license from IHS IS0/TR21704:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Internatinair PrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoISQ07 -All rights reserved etworking permitted without license from IHS IS0/TR 21704:2017(E) Contents Page Foreword ..iv Introduction ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions 4 Abbreviated terms ..1 5 Target objective .2 6 Chain manufacturers. ..2 7 Tested chain steels. .2 8 Equipment, specimen geometry and sampling ..3 9 Results ..4 9.1 Notch impact energy temperature of the tested steels 4 9.2 Comparison of the test results and test equipment of manufacturer 1 and manufacturer2 4 9.3 Conversion of the characteristic values determined at sub-size notch impact specimens...4 9.4 Validation of the conversion. .5 9.5 Scatter of the notch impact energy values determined with sub-size specimens ..5 9.6 Brittle fracture transition temperature .6 10 Specimen extension .7 10.1 Laser welding. .7 10.2 Friction welding .7 10.3 Extended super sub-size notch impact specimens 7 11 Derivation of the toughness criteria for characteristic values determined with sub- size notch impact specimens .8 12 Characteristic values of the round steel link chains from manufacturer M3 and M4 .9 12.1 Manufacturer M3. .9 12.2 Manufacturer M4.. .9 13 Characteristic values of the sub-size notch impact specimens, temperature and notch impact energy. 9 14 Requirements to the characteristic toughness values of the sub-size and the super sub-size notch impact specimens .10 15 Status of international standardization .11 Annex A (informative) Figures. ..12 Bibliography .43 iii HEJIANG INST OF STANDARDIZATION C15956617 ithout license from IHS