Nickel steel

Nickel steel

The percentage of Nickel varies
from 2 to 45 in steel. Steel having 2% Ni makes steel more suitable for rivets,
boiler plates, bolts and gears etc. Steel having Ni from 0.3 to 5% raises
elastic limit and improves toughness. Steel containing Nickel has very high
tensile strength. Steel having 25% Ni makes it stainless and might be used for
I.C. engine turbine blade etc. If Ni is present up to 27%, it makes the steel
non-magnetic and non-corrodible. Invar (Ni 36%) and super-invar (Ni 31%) are
the popular materials for least coefficient of expansion and are used for
measuring instruments, surveyor tapes and clock pendulums. Steel having 45% Ni
steel possesses extension equal to that of glass, a property very import making
links between the two materials i.e. in electronic valves and bulbs.

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