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Overcoming Corrosive Processes with High-Alloyed Stainless Steels

By Daniel Gulberg, Sandvik Materials Technology |

Advanced high-alloyed stainless steels with austenitic properties can address corrosion concerns in challenging phosphoric and nitric acid processes FIGURE 1. Forced-circulation evaporation is typically used in phosphoric-acid heaters for acid concentration[/caption] The growing worldwide demand for fertilizer has created a significant increase in production levels. As a consequence, operators face mounting pressure to keep up with these trends, and this challenge is especially evident in the greater expectations that are being placed on materials for critical tubes and pipes in heat exchangers. Heat exchangers are essential to fertilizer applications. Not only must they ensure efficient heat transfer from one medium to another while minimizing resistance to fluid flow through the tubes, the heat exchangers should also remain inexpensive in terms of both design and maintenance. This is where issues of corrosion set in, made worse by the fact that such problems may vary considerably from plant to plant depending on local service conditions. For these reasons, many materials traditionally favored by the industry — such as standard AISI 316L, 317L or 304L grades of stainless steel, depending on the application — may exhibit insufficient…
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