Steels with Cr-Mn-Ni-N
composition were called 200 Series of Stainless Steel.
The principle difference between 300 Series of Stainless Steel and this series was that
the Nickel used in 300 series of Stainless steel was partly replaced by Manganese and
Nitrogen. Nickel being a costly metal, the obvious advantage of 200 series was cost effectiveness.
During period of Nickel shortage 200 series of Stainless Steel have
been used across the board to replace 300 series of Stainless Steel with only minor design
and fabrication adjustments.
It was found that 200 Series have 40 % higher
yield strength than 300 series. The physical and mechanical properties of both
series are quite compatible. 200 series also has additional component of Carbon, which
gives higher effectiveness to the austenitic nature of
Stainless Steel.
201 and 202 stainless steels have properties similar to 301 and 302
series in annealed and cold rolled conditions and perform similarly. This steel can be
formed in the same equipment that is used for 300 series with the same lubricants and
annealed tempers of this Cr-Mn-Ni-N steel is much suitable for deep
drawing.
304 Stainless Steel is used in a kitchen utensil to a nuclear reactor.
201 has comparable properties for kitchen utensil application.200 Series has been used in
variety of applications in India for nearly 10 years running into a production statistics
of 200000 MT in 1988 to 600000 MT in 1999.
Usage of 201 will give much higher value for money because of lower initial cost for the
suggested application.
Thus other things being equal cost effectiveness of
200 series, leads to the conclusion that it is preferable to use 200 series of Steel
over 300 series.
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