ductility is the ability for a metal to be
Ductility Ductility is a measure of a material's ability to undergo significant plastic deformation before rupture, which may be expressed as percent elongation or percent area reduction from a tensile test. According to Shigley's Mechanical Engineering Design--10th Ed. [1] significant denotes about 5.0 percent elongation (Section 5.3, p. 233). See also Eq. 2-12, p. 50 for definitions of percent elongation and percent area reduction. Ductility is often characterized by the material's ability to be stretched into a wire.
Cast iron Cast iron tends to be brittle, except for malleable cast irons. With its relatively low melting point, good fluidity, castability, excellent machinability, resistance to deformation and wear resistance, cast irons have become an engineering material with a wide range of applications and are used in pipes, machines and automotive industry parts, such as cylinder heads (declining usage), cylinder blocks and gearbox cases (declining usage). It is resistant to destruction and weakening by oxidation.