Duplex Steel

We offer high quality Duplex Steel which is made using sturdy alloys. Our Duplex Steel is highly demanded because of various exceptional attributes. We supply Duplex Steel which is durable, corrosion and temperature resistant and has low thermal expansion. Our Duplex Steel is used in various industries and available at competitive prices.

Applications

Pressure vessels, tanks, piping, and heat exchangers in the chemcal processing industry
Piping, tubing, and heat exchangers for the handling of gas and oil
Effluent scrubbing systems
Pulp and paper industry digesters, bleaching equipment, and stock-handling systems
Rotors, fans, shafts, and press rolls requiring combined strength and corrosion resistance
Cargo tanks for ships and trucks
Food processing equipment
Biofuels plants

Standards

ASTM/ASME : A240 UNS S32205/ S31803
EURONORM : 1.4462 X2CrNiMoN 22.5.3
AFNOR : Z3 CrNi 22.05 AZ
DIN : W. Nr 1.4462

General Corrosion in Wet Process Phosphoric Acids

Corrosion Rate, ipy
Geade			Solution A 140^oF			Solution B, 120^oF
2205			3.1			3.9
316L			>200			>200
940L			47			6.3
Composition, wt %
P₂O₅	HCL	HF	H₂SO₄	Fe₂O₃	Al₂O₃	SiO₂	CaO	MgO
Sol A 54.0	0.06	1.1	4.1	0.27	0.17	0.10	0.20	0.70
Sol B 27.5	0.34	1.3	1.72	0.4	0.01	0.3	0.02	-

Stress Corrosion Cracking Resistance

Grade	Boiling 42% MgCl₂	Wick Test	Boiling 25% Nacl
2205	F	P	P
254 SMO®	F	P	P
Type 316L	F	F	F
Type 317L	F	F	F
Alloy 904L	F	P or F	P or F
Alloy 20	F	P	P

Chemical Analysis Typical Values (Weight %)

C	Cr	Ni	Mo	N	Others
0.020	22.1	5.6	3.1	0.18	S = 0.0001

Note : PREN = [Cr %] + 3.3 [Mo %] + 16 [N %] ≥ 34.

Mechanical Properties at Room Temperature

	ASTM A 240	Typical
Yield Strength (0.2%), ksi	65 min.	74
Tensile Strength, ksi	90 min.	105
Elongation, %	25 min.	30
Hardness HB	293 max.	256

Tensile Properties at Elevated Temperatures

Temperature ^oF	122	212	392	572
Yield Strength (0.2%), ksi	60	52	45	41
Tensile Strength, ksi	96	90	83	81

Physical Properties

Temperature ^oF	ASTM A 240	68	212	392	572
Density	Ib/in²	0.278	-	-	-
Modulus of Elasticity	psi x 10⁶	27.6	26.1	25.4	27.9
Linear Expansion (68^oF-T)	10^-6/1^oF	-	7.5	7.8	8.1
Thermal Conductivity	Btu/h h^oF	8.7	9.2	9.8	10.4
Heat Capacity	Btu/h Ib^oF	0.112	0.119	0.127	0.134
Electrical Resistivity	Ωin x 10^-6	33.5	35.4	37.4	39.4