F51 (UNS S31803 / W.Nr. 1.4462)

F51 (UNS S31803 / W.Nr. 1.4462) combines improved resistance to stress corrosion cracking, pitting, crevice corrosion and high strength when compared with other stainless alloys. F51 resists chloride environments and sulphide stress corrosion.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
F51	–	–	F51	S31803	X2CrNiMoN22-5-3	1.4662	–	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Mo	N	Fe
F51	≤0.03	≤1.0	≤2.0	≤0.03	≤0.02	21.0-23.0	4.5-6.5	2.5-3.5	0.08-0.20	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	620	450	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

The material combines good mechanical strength and ductility with moderate to good corrosion resistance in a variety of environments. This material is generally supplied in the annealed condition giving yield strengths in excess of 65 KSI (450Mpa), this material cannot be hardened by heat treatment but stronger surface strengths can be achieved by cold working.

Applications

Typical applications include pumps, valves, pipework, flanges etc together with various applications in the oil and gas, brewing, power generation and chemical engineering industries. In fact this alloy can be used successfully as an alternative to 300 series austenitic stainless steels in almost all applications where higher mechanical strength/lower weight is required.