high machinability

low melting point

high tensile strength

all of the above.

improves wear resistance, cutting ability and toughness

refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties

improves cutting ability and reduces hardenability

gives ductility, toughness, tensile strength and anticorrosion properties

copper

chromium

nickel

silicon

it easily machinable

it brittle

it hard

the casting unsound

1539°C

1601°C

1489°C

1712°C