On what property u can distinguish material as brittle or
ductile?

Answer Posted / bn

In Mechanical Engineering, a material is considered brittle
if the extension at tensile failure is 5% or less. If the
extension is more than 5%, the material is ductile.
Cast iron is considered brittle.
Steels are considered ductile but there is a wide range of
values. Hardened and tempered steels, like high tensile
steel for bolting, is not very ductile compared to annealed
carbon steel. Allen screw steel is even less ductile.

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