A previous paper presented at this Conference in 1955 was concerned principally with corrosion resistant materials for processing citrus products. Although this paper considered several different materials, each of which might prove satisfactory for certain operating conditions, the citrus processing industry has been able to satisfy most of its requirements with a relatively few alloys. These alloys are principally the chromium and the chromium-nickel alloys that are generally classified as stainless steels. This series of steels lends itself to certain basic treatments that have a very significant effect upon the mechanical, physical, and chemical properties. This paper will be concerned principally with these basic treatments and with certain specific treatments for special requirements.

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