F55 (UNS S32760 / W.Nr. 1.4501)

F55 (UNS S32760 / W.Nr. 1.4501) has excellent corrosion resistance to a wide range of areas, especially resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with critical pitting temperature that is more than 50°C (122°F). This material is known to also have high strength and extended lifecycle. It is 10% lighter than grade 316 steel, ideal for sub-zero service, and more cost effective than nickel alloys. Stainless steel grade F55 can be easily machined and welded.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
F55	022Cr25Ni7Mo4WCuN	–	F55	S32760	X2CrNiMoCuWN25.7.4	1.4501	Z3CND25.06Az	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Mo	N	W	Fe
F55	≤0.03	≤1.0	≤1.0	≤0.03	≤0.01	24.0-26.0	6.0-6.8	3.0-4.0	0.2-0.3	0.5-1.0	Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HRB
8.0	1030-1130	≥750	≥550	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 with additions of chromium, molybdenum, and nitrogen F55 has enhanced pitting and crevice corrosion resistance compared with the ordinary austenitic or duplex types.