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How to use Alloy 825
Release time: 2021-05-07 15:49:03  Hits: 154

Sometimes described as a super austenitic stainless steel, 825 is a long service forerunner of the nickel iron chromium alloys. With the addition of molybdenum, copper and titanium, this alloy will give excellent corrosion resistance to a broad base of severe environments. It has good resistance to stress corrosion cracking and the high nickel content in conjunction with the copper and molybdenum gives it outstanding resistance to reducing environments such as those containing sulphuric and phosphoric acids. The alloys chromium content confers resistance to a variety of oxidising substances such as nitric acid, and the molybdenum also aids resistance to pitting and crevice corrosion. The alloy will also retain its strength from cryogenic temperatures up to 400 oC and higher. It is used extensively in the chemical processing industry but because of its excellent resistance to corrosive environments, including in particular, seawater, it has become an excellent material for the offshore industry. The only slight downside is its relative high (22%) iron content which makes it less resistant to alkalis. Alloy 825 is readily available as raw material in most shapes and sizes and is not a problem to machine which makes it generally less expensive to use than the high nickel Chromium alloys.

 

Alloy 825 may not be the ultimate choice when faced with severe corrosive environments, but taking into account its cost and availability, it is certainly a prince among corrosive resistant alloys. 


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