T-201 Stainless Steel

T – 201 Stainless Steel is an austenitic chromium – nickel – manganese stainless steel that was originally developed to conserve nickel to lessen the impact of wildly fluctuating nickel prices .

Stainless steel is generally defined as an iron – based alloy containing more than 11 % chromium , being the minimum amount necessary to form a protective layer of chromium oxide on the surface of the metal .

T – 201 has seen service for a number of years as a viable alternative to T – 301 and T – 304 stainless steels in the construction of railroad cars , architectural uses such as interior handrails ; elevator cabs ; appliances ; washing machines ; machine frames ; and in various food service related applications such as restaurant equipment ,    beverage dispensers and ice machines .

Better grades of T -  201 will typically contain at least 16 % chromium and 3 1/2 % to 5 1/2 % nickel and 5 1/2 % to 7 1/2 % manganese . The manganese content is increased to offset the reduction in nickel content from   ” 8.00 % – 11.00 %  to  3.50 %  – 5.50 % ” .

A representative high – grade T – 201 stainless steel might be expected to contain the following chemical content :

C   :  0.150 % Max
Mn :  5.500 % – 7.500 %
P   :  0.060 % Max.
S   :  0.030 % Max.
Si  :  1.000 % Max .
Cr  :  16.000 % – 18.00 %
Ni  :  3.500  % – 5.50 %
N   :  0.250  % Max.
Fe  :  Balance

Unfortunately , there is no laboratory test that can predict whether a UNS S 20100 material will perform differently than a Type 304 material in a given application .Existing standard  corrosion tests are usually aggressive and will cause corrosion in both T – 304 and T – 201 stainless steels.

The only way to know for certain if the T – 201 stainless steel will perform satisfactorily in a given environment is to make trial products and expose them to service in corrosion atmospheres of varying degree .

We would be very appreciative if those of you who have personal experience with the use of  T – 201 stainless steel in the manufacture of your product    would be gracious enough to offer the benefit of your experience .

Thank you very much for your consideration and sharing.

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