F55 is a kind of super duplex stainless steel, superior to the 2205 in overall performance."Super" refers to the high alloying of its components. Compared with other duplex stainless steels, the high alloying of super duplex steels mainly [TJC STEEL]refers to high molybdenum and nitrogen.

 

National Standard

CHINA	GB/T 20878-2007	022Cr25Ni7Mo4WCuN
	GB/T 21833-2008	S27603
	GB/T 31303-2014	[TJC STEEL]
AMERICA	ASTM A182-2006	F55，S32760
GEMANY	DIN EN 10088-1:2005	X2CrNiMoCuWN25-7-4
		1.4501

 

Component Specification (%)

GRADE	S27603*	F55*	1.4501
C	≤0.030	≤0.030	≤0.030
Si	≤1.00	≤1.00	≤1.00
Mn	≤1.00	≤1.00	≤1.00
P	≤0.030	≤0.030	≤0.035
S	≤0.010	≤0.010	≤0.015
Cr	24.00~26.00	24.00~26.00	24.00~26.00
Ni	6.00~8.00	6.00~8.00	6.00~8.00
Mo	3.00~4.00	3.00~4.00	3.00~4.00
W	0.50~1.00	0.50~1.00	0.50~1.00
Cu	0.50~1.00	0.50~1.00	0.50~1.00
N	0.20~0.30[TJC STEEL]	0.20~0.30	0.20~0.30

 

* : PREN = % Cr Mo + 16 x % N + 3.3 x % of 40 or higher

Commercial Brand

Rolled Alloys	Zeron 100
Industeel	UR2507W
Nippon Yakin	NAS 75N
BÖHLER	A911SA
Sandvik	SAF 32760™
Mannesmann	DMV 25.7 N

 

Characteristics Performance

(1) Excellent resistance to stress corrosion cracking, excellent resistance to pitting and crevice corrosion, resistance to various inorganic acids and organic acids, excellent resistance to non-oxidizing acid corrosion, strong alkali [TJC STEEL]corrosion.

(2) good weldability, excellent mechanical properties, can reduce the weight of the structure, with design advantages.

(3) In the working temperature above 300℃ for a long time service, the toughness of the material will decline significantly.

❒ applications

F55 has been included in the specification for metal materials and ASME boilers and pressure vessels resistant to sulphide stress [TJC STEEL]cracking for NACE MR 0175 oil field equipment. Its applicable temperature is below 315 ° C. Its main applications include: submarine pipelines, flue gas desulfurization, osmotic desalination equipment, sulfuric acid plants, and fasteners for Marine engineering.