Duplex & Super Duplex Steel

Duplex UNS S31803 / UNS S32205 | 1.4462

• Good weldability in thick plates.
• Good low temperature toughness.
• Resistance to stress corrosion cracking of importance in many applications including hot water tanks, process plant, brewing tanks, and desalination plant.
• Higher strength which is around twice that of Type 304 austenitic stainless steel. This leads to reduced plate thicknesses being used in fabrications reducing the weight which is of particular significance in items such as pressure vessels, storage tanks, and structural applications such as bridges.

TYPE	GRADE	EN STEEL NUMBER	UNS
Duplex	S31803	1.4462	S32205/2205

 

CHEMICAL ANALYSIS (% MAX OR RANGE)
C	Mn	P	S	Si	Cr	Ni	Mo	N
0.03	2.00	0.03	0.02	1.00	21.0-23.0	4.5-6.5	2.5-3.5	0.08-0.20

 

Tensile	Yield	Elongation	Hardness
MPa min	MPa min	% min	Brinell max
620	450	25	293

APPLICATIONS

• Nuclear Sector
• Oilfield Fabrications
• Dished Ends
• Filters
• Heat Exchangers
• Pressure Vessels
• Storage Tanks
• Valves
• Flanges and Fittings
• Condensers
• Line Pipe
• Pipe Caps/Pipe Fittings
• Silos
• Subsea Hydraulic Equipment

S32750 (1.4410) & S32760 (1.4501) Super Duplex Stainless Steel Super Duplex stainless steel, relative to other stainless steel products, gives:
• High corrosion resistance
• High resistance to stress corrosion cracking
• High yield strength and tensile strength

 

TYPE	GRADE	EN STEEL NUMBER	UNS
Super Duplex	S32750	1.4410	2507
Super Duplex	S32760	1.4501

 

CHEMICAL ANALYSIS S32750  (% MAX OR RANGE)
C	Mn	P		S	Si		Cr	Ni		Mo	N
0.03	1.20	0.035		0.02	0.80		24.0-26.0	6.0-8.0		3.0-5.0	0.24-0.32
Tensile			Yield			Elongation			Hardness
MPa min			MPa min			% min			Brinell max
795			550			15.25%			310

 

CHEMICAL ANALYSIS S32760 (% MAX OR RANGE)
C	Mn	P		S	Si		Cr	Ni		Mo	N
0.03	1.00	0.03		0.01	1.00		24.0-26.0	6.0-8.0		3.0-4.0	0.20-0.30
Tensile			Yield			Elongation			Hardness
MPa min			MPa min			% min			Brinell max
750			550			25			270