SS316 vs Duplex 2205: Strength & Cost Showdown

Duplex 2205 and 316:Main Differences

a) The yield strength of duplex 2205 is one time higher than 316L, and it has enough plastic toughness for molding. And the wall thickness of the pressure vessel made of duplex 2205 is 30-50% thinner than that of 316L, which can save the cost.

b) Duplex 2205 performs excellent on stress corrosion resistance, especially when it is used in the marine environment containing chloride ions. However, stress corrosion is a prominent problem to solve for austenitic stainless steel including 316L.

c) Duplex 2205 performs a better corrosion resistance than 316L does in many mediums. It performs a very high corrosion resistance in acetic acid, formic acid, and even can be a replacement of austenitic stainless steel, and corrosion resistant alloy. However, to choose duplex 2205 or 316L, it is still determined by the environmental needs and cost.

d) Duplex 2205 has high strength and ideal local corrosion resistance, wear corrosion resistance and corrosion fatigue performance, which are better than 316L stainless steel.