no graphite

a very high percentage of graphite

a low percentage of graphite

graphite as its basic constituent of composition

high tensile strength

its elastic limit close to the ultimate breaking strength

high ductility

all of the above

free carbon

graphite

cementite

white carbon

free form

combined form

nodular form

partly in free and partly in combined state.

tenacity

hardness

plasticity

corrosion resistance