It is mostly of alloys and its microstrcture lastly its application in enineering

1. What are the
main reasons
behind alloying
the elements?

2. The main reasons behind
alloying the elements is to
increase various properties
such as
hardenability,corrosion
resistance,toughness,strengt
h,magnetic
properties,machinability & to
prevent brittleness.

3. About 2-5% Nickel is
added to steel to
improve toughness
And 12-20%to
increase corrosion
resistance

5. Nickel steels are widely used for
parts subjected to fatigue and
impact load .
They possess greater tensile
strength together with considerable
ductility and toughness.
The most nickel steels contain 0.25
to 0.4 % Carbon and 1 to 5 % nickel.
These steels normally contain small
amounts of manganese to stabilise
the carbide phase.

6. Steels with high nickel content
are extremely tough and are
highly resistance to corrosion.
They also have low coefficient
of thermal expansion i.e. they
expand very little with the
change in temperature.

7. Nickel steels with
composition 0.40%
carbon, 1.50%
manganese & 1.0%
nickel is used in
making

11. Nickel steels with
composition 0.12%
carbon, 0.45%
manganese & 3.0%
nickel is used in
making