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DIN ISO/TR 21704:2019-09;DIN SPEC 5689:2019-09

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

Fecha edición: 2019-09-01
En Vigor
Idiomas disponibles: Alemán
Resumen: This document provides the results of testing on the toughness of round steel chains. In an initial study programme, the fundamental effects on the load bearing capacity of round steel chains were examined. The material strength and material toughness along with the temperature were incorporated in the tests. The tests were conducted on chains 16 x 48 and the specimens taken from these. To determine the toughness of sub-size round steel link chains, the required tests were performed with sub-size notch impact specimens that were taken from the unwelded legs of the chains. The safety of round steel link chains was examined in detail in a load bearing concept and in a brittle fraction transition temperature concept. Temperatures and minimum notch impact energy values were determined using fracture mechanics methods, with the aim of ensuring sufficient load bearing capacity for a damaged chain at design temperature. These tests and their results are documented in ISO/TR 23602. This document 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. 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.

Keywords: Chains|Connection technology|Dimensional tolerances|Dimensions|Hoisting slings|Lifting equipment|Mechanical properties|Properties|Round steel chains|Specifications|Steels|Tensile testing|Test specimens|Testing|Toughness|Welded
ICS: 53.020.30 - Accesorios para equipos de elevación
CTN:

Equivalencia Internacional

Idéntica ISO/TR 21704:2017

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