German Silver It is also known as Ni-silver. It contains 60% Cu, 30% Ni and 10% Zn. It is very ductile and malleable and displays silvery appearance. It is used for electrical contacts, resistance wires, casting of high quality valves and taps and jewellery.
Constantant
It contains 45% Ni and 55% Cu. It has high specific resistance, which is unaffected by temperature variation. It is used for accurate resistors, thermocouples, wheat stone bridge, low temperature heaters and resistances.
Monel metal
It contains 68% Ni, 30% Cu, 1% iron and small additions of Mn and other elements. It has good mechanical properties and can maintain them at elevated temperatures. It has high corrosion resistance, can be cold and hot worked, cast, forged and welded. It is widely used for marine parts pump impellers, propellers, evaporators and heat exchangers in chemical works.
Inconel
It contains 80% Ni, 14% Cr and 6% iron. It has high resistance to corrosion and oxidation at elevated temperatures. It can be readily cold and hot worked, but does not respond to heat treatment. It is widely used in processing uranium and for heating for high temperature heating elements.
Nichrome
Like Inconel it is also a nickel-chromium alloy which is extensively used in electrical appliances as a resistance wire.
Incoloy
It is also a Ni-based alloy which is widely used as a high temperature alloy. It consists of 42% Ni,13 % Cr, 6% Mo, 2.4% Ti, 0.04% C and the rest iron.
K-monel
It possesses composition as monel, but about 3 to 4% Al is added to it. It carries similar applications as monel, but has better mechanical properties than that.
Nimonic alloy
It contains 80% Ni and 20% Cr. It has high strength and ability to operate under intermittent heating and cooling conditions. It is widely used in gas-turbine engines.
