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ISO 9649 Metallic materials - Wire - Reverse torsion test

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ISO 9649 Metallic materials - Wire - Reverse torsion test

This International Standard specifies a method for determining the ability of metallic wire of diameter dimension from 0,3 mm to 10,0 mm inclusive to undergo plastic deformation during reverse torsion. This test is used to detect surface defects, as well as to assess ductility.


A test piece of wire is twisted a specified number of turns through 360° around its own axis in one direction, and then a specified number of turns through 360° in the opposite direction.


Core Definition and Purpose of the Test
Repeated Torsion Test: A mechanical test in which one end of a metal wire specimen is fixed while the other end is subjected to unidirectional continuous twisting along its axis, or alternating forward and reverse twisting, until the specimen breaks or reaches the specified number of twists.
Core Purpose: To evaluate the torsional plasticity, torsional fatigue resistance, uniformity, and surface quality of metal wires, and to verify whether the wire meets torsional requirements for subsequent processing (such as drawing, braiding, bending) and usage.
ISO 9649 Metallic materials - Wire - Reverse torsion test

Scope of ISO 9649
Applicable Materials: Metal wires including various carbon steels, alloy steels, stainless steels, copper and copper alloys, aluminum and aluminum alloys.
Size Limitation: Wire diameters ranging from 0.1mm to 10mm; any sizes beyond this range require mutual agreement for supplementary provisions.
Exclusions: Not applicable to wires with non-circular cross-sections, nor to torsion tests under special conditions such as high or low temperatures (refer to other specific standards for such cases).


Test sample:

Steel:  steel wire, steel rod, steel rebar;

Copper: copper wire, copper rod, copper alloy

Aluminum: Aluminum wire, aluminum rod, aluminum alloy;

Other metal: Rod, glass steel, alloy steel etc.

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