General Information

The properties of duplex stainless steels are achieved with overall lower alloy content than similar-performing super-austenitic grades, making their use cost-effective for many applications. Duplex grades are characterized into groups based on their alloy content and corrosion resistance.

Alloy	BÖHLER brand	WstNo.	UNS	ISO	AMS	ASTM	Others
Super Duplex	A913	1.4410	S32750	X2CrNiMoN25-7-4	–	–	F53
Duplex	A903	1.4462	S31803, S32205	X2CrNiMoN22-5-3	–	–	F51, STN: 17 381
Super Duplex	A911	1.4501	S32760	X2CrNiMoCuWN25-7-4	–	–	F55
Ferralium 255	A923	1.4507	S32550	X2CrNiMoCuN25-6-3			F61, F255