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ISO 9649:1990 Metallic materials - Wire - Reverse torsion test
standard by International Organization for Standardization, 02/01/1990
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Specifies a method for determining the ability of wire of diameter 0,3 mm to 10,0 mm inclusive to undergo plastic deformation during reverse torsion. This test is used for detecting surface and internal defects in wires. Gives symbols and designations, principle, testing machine, test piece, procedure and test report.