Duplex Stainless Steels - Service Properties

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European Steel Designation	UNS Nearest Fit	Service Properties	Applications
1.4362* X2 Cr Ni N 23-4*	S 39230* (replaces S 32304)	1.4362* has a general corrosion resistance equal to or better than 1.4301/1.4307 (AISI 304/304L)Duplex stainless steels generally have excellent resistance to corrosion and particularly to stress corrosion cracking when exposed to chloride bearing conditions.When compared with austenitic stainless steels the duplex steels have a high yield strength roughly double in the annealed condition offering considerable design advantages weight for weight.The duplex stainless steels can be strengthened by cold rolling to a high mechanical strength and exhibit a high resistance to relaxation therefore good spring properties.	Chemical, petrochemical and oilfield plant as pipe-work, fabrications and gaskets.
1.4462 X2 Cr Ni Mo N 22-5-3	S 39209 (replaces S 31803)	1.4462 has a general corrosion resistance equal to or better than 1.4401/1.4404 (AISI 316/316L)	As above and includes oil field applications where there is exposure to sulphide stress corrosion cracking.
1.4410 X2 Cr Ni Mo N 25-7-4	S 39275* (replaces S 32750)	1.4410 in addition to excellent general corrosion resistance this grade is highly resistant to corrosion by organic acids even at elevated temperatures.	As above
* Patented steel grade