ISO-21704 › Toughness of round steel link chains - Test with sub-size specimens

ISO-21704 - 1ST EDITION - CURRENT


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ISO/TR 21704:2017 contains investigations and investigation results on toughness of round steel link chains, tested with sub-size specimens.

It applies to round steel link chains for hand operated chain hoists of grade TH and VH and for sling chains used for chain slings of grade 8.

NOTE 1 Associated International Standards are ISO 16877, ISO 16872 and ISO 3076. In future it is intended to implement the results on toughness derived in this document in new standards.

Eleven steels, provided by four manufacturers, were tested to find a test regime on sub-size specimens and requirements on the notch impact toughness values at design temperature which resulted out of the tests. These requirements are adjusted to the toughness values of full size ISO-V specimens.

NOTE 2 The requirements are also valid for other cross sections of the chain than round.

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53.020.30 (Accessories for lifting equipment Including lifting hooks, shackles, link chains, wire ropes, etc. Wire ropes and link chains for general use, see 77.140.65)

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Document Number

ISO/TR 21704:2017

Revision Level

1ST EDITION

Status

Current

Publication Date

Feb. 1, 2017

Committee Number

ISO/TC 111/SC 1