Duplex UNS S31803 is the most common duplex grade in the market with high mechanical strength. It is widely used in Oil & Gas Industry, hydro power, pressure vessels, pulp & Equipment for the Paper Industry, Paper Industry, structural components and chemical tankers. The alloy is not intended to be used at temperatures above 300°C due to embrittlement.

UNS S31803 Duplex Stainless Steel

Chemical Composition

The following table lists alloy 2205 stainless steel chemical composition based on cast analysis.

			Chemical Composition, %
Country	Steel Grade (UNS)	Standard	C, ≤	Si, ≤	Mn, ≤	P, ≤	S, ≤	Cr	Ni	Mo	N
US	2205 (UNS S32205, UNS S31803)	ASTM A276/A276M; ASTM A240/A240M	0,030	1,00	2,00	0,030	0,020	22.0-23.0	4,5-6,5	3.0-3.5	0.14-0.20

Physical Properties

Notes:

1 g/cm3 = 1 kg/dm3 = 1000 kg/m3;
1 μΩ·m = 1 Ω·mm²/m
1 GPa = 1 kN/mm2

Physical Properties
Density, g/cm3 (lb/in3)	7,83 (0.283)
Melting point, ℃ (°F)	1385-1440 (2525-2630)
Magnetic	Yes
Electrical resistivity, μΩ·m	0,85 (20 ℃) (68 °F)
0,90 (100 ℃) (212 °F)
0,95 (200 ℃) (392 °F)
1,0 (300 ℃) (572 °F)
Specific heat capacity, J/(kg·K)	470 (20 ℃) (68 °F)
500 (100 ℃) (212 °F)
530 (200 ℃) (392 °F)
560 (300 ℃) (572 °F)
Thermal conductivity, (W/m·K)	15,0 (20 ℃) (68 °F)
15,9 (100 ℃) (212 °F)
17,0 (200 ℃) (392 °F)
18,0 (300 ℃) (572 °F)
Modulus of elasticity, Gpa	190 (20 ℃) (68 °F)
180 (100 ℃) (212 °F)
175 (200 ℃) (392 °F)
171 (300 ℃) (572 °F)
Mean coefficient of thermal expansion, (10-6/K)	13,5 (20-100 ℃) (68 °F – 212 °F)
14.0 (20-200 ℃) (68 °F – 392 °F)
14.6 (20-300 ℃) (68 °F – 572 °F)