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Duplex stainless steel. 22% chromium duplex (Austenitic / Ferritic) steel (type 2205), with moderate to high strength and good general corrosion resistance, stress corrosion and cracking resistance.
The alloy has the ability to withstand the chloride environment and sulfide stress corrosion, strength is about two times the strength of standard austenitic stainless steel. The alloy can be used successfully as a substitute for 300 series austenitic stainless steel for higher mechanical strength / lighter weight. F51 is easy to use for many standard welding arc welding equipment, but not recommended for oxyacetylene welding, because there may be the phenomenon of carbon metal welding.