IS 1599 specifies the standard testing method for determining the ability of metallic materials to undergo plastic deformation through bending. It outlines the apparatus requirements, test piece preparation, and the procedure for bending without reversing the direction of force, followed by visual assessment for cracks.
Specifies methods for bend and re-bend testing of steel products to assess their ductility.
Quick Reference Values
standard test temperature10°C to 35°C
distance between supports limitD + 3a ± 0.5a
Key Formulas
L = D + 3a (Distance between supports, where D is mandrel diameter and a is specimen thickness or diameter)
Practical Notes
IS 1599 only provides the testing method; the required bending angle and mandrel diameter must always be sourced from the specific product standard (e.g., IS 1786 for TMT bars).
The bending force must be applied smoothly and continuously without any shock loads.
A sample passes if no cracks or ruptures are visible to the naked eye on the outer (tension) surface after bending.