"Corrosion properties of 201 grade stainless"

Question:

"I am looking for information on the corrosion properties of 201 grade stainless steel - ie the effects of different chemicals on this stainless and rates of corrosion etc. Do you have anything you could e-mail me (PDF file, perhaps?) or would you know where I may obtain any such information? I have tried libraries, and have information on 304 and 316 steels in abundance, but 201 steel data seems much scarcer."

Answer:

You are correct in the lack of corrosion data for 201SS. It is a reflection of its lack of popularity (and design) for corrosive service. I do not have much information to share with you; however, I would consider the following points, based on its chemistry. 201SS is a metastable austenitic stainless steel, with a partial substitution of manganese for nickel to provide the austenitic microstructure. Therefore, as chromium, molybdenum and nitrogen are the primary elements in determining corrosion resistance in the 200 and 300-series stainless steels, I would assume that 201SS possesses similar corrosion resistance to that of 304SS. A difference between 304SS and 201SS is the higher carbon content of 201SS, with its probable correspondingly reduced intergranular corrosion resistance, compared with 304SS, in the as-welded condition and in oxidizing acids, i.e., nitric acid. For specific applications, I would test before using.

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