201 stainless, they are Austenitic alloys, like 304, these alloys are not comparable to 304 in terms of durability and resistance to corrosion. They were created to cut the cost of Austenitic alloys by replacing most of the Nickel with Manganese or Nitrogen. The problem with this is that neither Manganese nor Nitrogen are nearly as resistant to corrosion as Nickel. So, although these alloys are NOT magnetic, they do not stand up to the elements nearly as well as 304 or 443. 201/202 is not very corrosion-resistant, especially under high temperatures, but low cost has made it more and more commonly used.
Type 201 Stainless Steel is covered by the following specifications:
Typical Mechanical Properties
Surface--stainless steel plate/sheet/coil
Those finished, after cold rolling, by heat treatment, pickling or other equivalent treatment and lastly by cold rolling to given appropriate luster.
Medical equipment, Food industry, Construction material, Kitchen utensils.
Those processed with bright heat treatment after cold rolling.
Kitchen utensils, Electric equipment, Building construction.
Those finished by polishing with No.100 to No.120 abrasives specified in JIS R6001.
Kitchen utensils, Building construction.
Those finished by polishing with No.150 to No.180 abrasives specified in JIS R6001.
Kitchen utensils, Building construction, Medical equipment.
Those finished polishing so as to give continuous polishing streaks by using abrasive of suitable grain size.
The surface finished by heat treatment and pickling or processes corresponding there to after hot rolling.
Chemical tank, pipe.
Type 201 is used to produce a range of household appliances, including sinks, cooking utensils, washing machines, windows, and doors. It is also used in automotive trim, decorative architecture, railway cars, trailers, and clamps. It is not recommended for structural outdoor applications because of its susceptibility to pitting and crevice corrosion