Corrosion Rate of the X2CrNiMoN22-5-3 Duplex Stainless Steel Annealed at 500 cc

Abstract

The X2CrNiMoN22-5-3 duplex stainless steel has an austenitic-ferritic microstructure with an average fraction of each phase of approximately 50%. At the duplex stainless steel the nitrogen serves to significantly improve the corrosion resistance of the alloy also in the welded condition. These steels present the excellent corrosion resistance of austenite steel, and the high mechanical behaviour of ferrite steel. However, the performance presented by duplex stainless steels can be drastically reduced by undesirable phases, such as sigma phase, chi phase, secondary austenite and a lot of chromium-rich and carbides precipitates. In this case an upper temperature limit of 300• C has been placed in the use of X2CrNiMoN22-5-3 steel in the industry mainly due to 475• C embrittlement. The purpose of this work was to ascertain how 60 min isothermal heat treatments at 500• C and corrosion time influence on the relative mass loss, profile roughness parameters and endothermal process by dynamic scanning calorimetry curves of heating measurement from 400 to 600• C of X2CrNiMoN22-5-3 duplex stainless steel. The influence of boiling nitric acid on the steel corrosion resistance was investigated using weight loss and profile roughness parameters.

Corrosion of the 1.4362 Duplex Stainless Steel in a Nitric Acid Environment at 333 K

“…The ferritic-austenitic steels, called duplex steels, have become increasingly more popular among a wide variety of corrosion-resistant steels. They are used in a wide range of industrial and civil engineering applications and * corresponding author their properties have continuously been studied to improve the quality and performance [11][12][13][14][15][16]. Low maintenance costs, very high material reliability and good environmental-factor resistance constitute further important arguments for enhancing the array of applications of these steels.…”

Corrosion of 1.4110 stainless steel at nitrate acid at 323 K

“…Along with the increasing content of the chromium, nickel, molybdenum the corrosion resistance is gaining. Corrosion is a phenomenon of material damage as a result of the chemical and electrochemical environment influence [8][9][10][11][12].…”

“…Animal products and biological substances are important corrosive environmental factors in agricultural industry. Therefore, corrosion in agricultural industry is very a difficult and also dangerous process [27][28][29][30][31][32].…”

“…Along with the increasing content of the chromium, nickel, molybdenum the corrosion resistance is gaining. Corrosion is a phenomenon of material damage as a result of the chemical and electrochemical environment influence [8][9][10][11][12].In alloys and metals changes occur as a result of interaction with the surrounding environment. The corrosion process begins at the point of contact with the environment, on the surface of the metal, it goes deep into the material.…”

“…Animal products and biological substances are important corrosive environmental factors in agricultural industry. Therefore, corrosion in agricultural industry is very a difficult and also dangerous process [27][28][29][30][31][32].The environment, which agricultural machines and devices work in, is classified as very aggressive [29][30][31][32]. The reason for this, among others, is high nitrogen content in the atmosphere and in animal waste, which can form chemical compounds.…”