Stainless Steel - Grade ER2209/1.4462

Description

ER2209/1.4462 is a duplex stainless steel filler metal designed for welding austenitic-ferritic stainless steel alloys containing approximately 22% chromium, 5% nickel, and 3% molybdenum. It exhibits high tensile strength, resistance to stress corrosion cracking, and improved weldability compared to the base metal.

Chemical Composition

Element	Weight %
Carbon (C)	0.03 max
Manganese (Mn)	0.50-2.0
Silicon (Si)	0.90 max
Chromium (Cr)	21.5-23.5
Nickel (Ni)	7.5-9.5
Sulfur (S)	0.03 max
Phosphorus (P)	0.03 max
Molybdenum (Mo)	2.5-3.5
Copper (Cu)	0.75 max
Nitrogen (N)	0.08-0.20

Mechanical Properties

Duplex 2205 exhibits superior mechanical properties compared to standard austenitic stainless steels:

Ultimate Tensile Strength: 104,400 psi (720 MPa)

Yield Strength (0.2% offset): 81,200 psi (560 MPa)

Elongation: 26%

Thermal & Physical Properties

Coefficient of Thermal Expansion (20-100°C): 13.5 x 10^-6 /°C

Thermal Conductivity (20°C): 15 W/m•K

Density: 7.8 g/cm³

Other Designations

UNS Number: S39209

AWS Classification: ER2209

DIN Number: 1.4462

Fabrication and Heat Treatment

Welding: GTAW, GMAW, SAW

Shielding Gas: 100% Argon for GTAW, Argon + 2% Oxygen for GMAW

Flux: Agglomerated or fused for SAW

Heat Treatment: Solution annealing at 1040-1100°C followed by water quenching

Applications

Welding of duplex stainless steel pipes and fabrications in the offshore oil and gas, chemical processing, and pulp and paper industries

Cladding of carbon and low-alloy steels to obtain corrosion-resistant layers

Supplied Forms

Solid wire for GTAW, GMAW, and SAW processes

Available in various diameters and spool/coil sizes

Features

High tensile strength and resistance to stress corrosion cracking

Improved resistance to pitting and intergranular corrosion in chloride and hydrogen sulfide-containing environments

Suitable for welding duplex stainless steels with 22% chromium, such as UNS S31803 and S32205

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