DUPLEX 2205 / DUPLEX UNS S32205 / S31803 DUPLEX STEEL WNR 1.4462

Duplex Steel 2205 has exceptional corrosion resistance in wide range of extreme atmospheres as it’s blended with trio-formulae of nickel-molyaoenum-chromium duplex which has an addition of tungsten. Duplex is especially resistant to pitting and cleft corrosion because of the high molybdenum content in it. Carbide precipitation is minimized due to the low carbon content in order to maintain the corrosion resistance in as welded structures.Decent sulfide stress corrosion resistance, High Strength, better weldability and workability.

Used in chemical processing pulp and paper production and waste treatment and pollution control. Also used in Food processing equipment, Chemical process vessels, piping and heat exchangers, Pulp mill digesters, Flue gas desulfurization equipment, bleach washers, chip pre-steaming vessels, Oil field piping and heat exchangers. Products are available in plate, sheet, stripe, wire, round, forging stock, tubes and plates.

Elements	UNS 32205	UNS 31803
Mn	2.00	2.00
Si	1.0	1.0
P	0.03	0.03
S	0.02	0.02
C	.030	.030
N	0.14~0.20	0.08~0.20
Mo	3.0~3.5	2.5~3.5
Ni	4.5~6.5	4.5~6.5
Cr	22.0~23.0	21.0~23.0

Property		UNS S32205	UNS S31803
0.2% proof stress [MPa]		≥450	≥450
Tensile strength [MPa]		≥655	≥620
Elongation [%]		≥25	≥25
Hardness	[Hv]	–	–
Hardness	[HB]	≤293	≤293

Density [g/cm3]		7.80
Specific heat [J/kg . K]		460
Electrical resistivity [μΩ . cm]		87.0
Thermal conductivity [W/m . K]		13.9
Average coefficient of thermal expansion [10-6 /°C]	20~100°C	12.7
	20~200°C	13.1
	20~300°C	13.5
	20~400°C	13.8
Young’s modulus [MPa]		19.5 × 10^4
Magnetism		Y (magnetizable)
Melting range [°C]		1420~1465