When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces Alloy cast iron.
Alloy cast iron - cast iron containing alloying elements (usually nickel or chromium or copper or molybdenum) to increase the strength or facilitate heat treatment.
Alloy cast iron - an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting.