The influence of N, Cr, Ni, Cu and W on the ferrite content and the mechanical properties was investigated. The yield strength is not sensitive to ferrite content and variations in alloying elements, with the exception of W. The UTS increases with nitrogen and tungsten. Electrochemical tests and SCC tests in CO2-H2S-Cl− environments show an optimum in critical current and cracking resistance respectively for 50–60 % ferrite. Increasing Cr from 22 to 25 % in a 5.2 % Ni, 3 % Mo and 0.15 % N raises the ferrite content beyond the optimum range and decreases the SCC resistance.

Subject
Nickel based alloys, Ferrite content, Tungsten, Mechanical properties, Constants, Nitrogen, Steel, Environments, Corrosion resistance, Duplex stainless steel, Ferrite, Stress corrosion cracking, Austenite
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1986
Association for Materials Protection and Performance (AMPP)
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