F53 (UNS S32750 / W.Nr. 1.4410)

F53 (UNS S32750 / W.Nr. 1.4410) is a superduplex stainless steel characterized by higher contents of chrome, molybdenium and nickel than standard duplex steels, resulting in increased corrosion resistance. These steels were developed for applications in aggressive chloride environments. They also have high mechanical strength and low thermal expansion due to the duplex structure.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
F53 URANUS 47N	–	–	F53	S32750	X2CrNiMoN25-7-4	1.4410	Z3CND25.07Az	–	–	2507

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Mo	N	Fe
F53	≤0.03	≤0.8	≤1.2	≤0.02	≤0.03	24.0-26.0	6.0-6.8	3.0-5.0	0.24-0.32	Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRB
8.0	1130-1280	≥730	≥530	25	/

Available Products and Specifications

Rod, Bar, Wire and Forgings	ASTM A182
Plate, Sheet and Strip	ASTM A312
Pipe and Tube	ASTM A167, 240
Welding Product	–
Others	ASTM A403

Features

F53 has excellent resistance to pitting and crevice corrosion resistance compared with the ordinary austenitic or duplex types. Due to this F53 stainless steel is used primarily in highly corrosive conditions.