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Duplex Alloy 255

(UNS S32550)

Single Figures are Maximums
0.04 C, 1.50 Mn, 0.04 P, 0.03 S, 1.00 Si, 24.0/27.0 Cr, 4.50/6.50 Ni, 2.90/3.90 Mo, 1.50/2.50 Cu, 0.10/0.25 N, Bal. Fe

A duplex alloy with austenite distributed within a ferrite matrix. Good general corrosion resistance to a variety of media, with a high level of resistance to chloride pitting and stress-corrosion cracking. Useful service limited to 500°F (260°C) maximum.


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