Abstract
This paper deals with the effects of alloying elements on hot workability, mechanical properties, pitting corrosion, and stress corrosion cracking of duplex stainless steel. Test materials are laboratory-melted 20 to 30 pct Cr duplex stainless steels, containing different amounts of Ni, Mo, N, and other elements. Corrosion resistance, tensile properties, and hot workability depend on the ferrite content in the microstructure. Cr, Mo, and N are beneficial in improving the resistance to pitting and general corrosion. Susceptibility to stress corrosion cracking in sour gas environments depends on the microstructure. Based on these test results, duplex stainless steel tube containing 22 pct Cr-5.5 pct Ni-3 pct Mo-0.15 pct N for deep corrosive well service has been developed on a mill production basis. This tube has a ferrite content of about 50 pct and can be produced in three grades of yield strength, 9.4, 16, and 20 MPa (65, 110, and 140 ksi).
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