cast iron

forged steel

mild steel

high carbon steel

nickel, chromium and iron

nickel, copper

nickel, chromium

nickel, zinc

ductile

malleable

homogeneous

anisotropic.

tin, antimony, copper

tin and copper

tin and lead

lead and zinc

dipping steel in cyanide bath

reacting steel surface with cyanide salts

adding carbon and nitrogen by heat treatment of steel to increase its surface hardness

obtaining cyanide salts