High Strength AND

Duplex UNS S31803/S32205 is a ferritic-austenitic stainless combining high mechanical strength, ductility and hardness with excellent resistance to corrosion and erosion.

Mechanical Test Requirements:

Tensile - 90,000 psi min

Yield - 65,000 psi min

Elongation - 25 % min

Hardness - 293 HBN Max

Corrosion Resistance:

The corrosion resistance of S31803/S32205, under most conditions of service, is superior to that of the fully austenitic type 304, 316 and 317L stainless steels. It has excellent resistance to sulfuric, phosphoric, nitric, and many other acids and salts.

Duplex UNS S31803/S32205 is highly resistant to acetic, formic and other organic acids and compounds. It is particularly suitable for the higher concentrations and temperatures where pitting and preferential corrosion are common causes of failure with most conventional austenitic stainless steels in the presence of chlorides and other impurities. Like the austenitic stainless steels, S31803 is not generally suitable for handling hydrochloric acid and other severely reducing acids and chemicals.

Stress-Corrosion Resistance:

Resists Chloride Stress Corrosion Cracking

Duplex UNS S31803/S32205 has improved resistance to stress-corrosion cracking, crevice corrosion and pitting when compared to austenitic stainless steels such as types 304, 316, 317L and even the 20Cr-25Ni grades. It is highly resistant to stress-corrosion cracking in sodium chloride, seawater and many other environments.