Designated as UNS S32205 or DIN W.Nr. 1.4462, duplex 2205 is an austenitic & ferritic two-phase Cr-Mo-Ni alloyed stainless steel which has a roughly mixed 1:1 ferrite and austenite structure. It is the most widely used duplex stainless steel grade and is characterized by high-yield strength, double that of standard austenitic stainless steel grades. Piping components made from duplex 2205 have good fatigue strength, as well as outstanding resistance to stress-corrosion cracking, crevice, pitting, and general corrosion in severe environments. They are widely used in chemical processing, oil & gas piping, marine & high chloride environments, pulp and paper industry, and food industry, etc. Duplex 2205 materials can be furnished in the form of plates, bars, pipes, tubes, fittings, flanges, and valves in accordance with relative standards such as ASTM A240, ASTM A479, ASTM A484, ASTM A276, ASTM A789, ASTM A790, ASTM A182, etc.

1. Chemical Composition of Duplex 2205

The Chemical Composition of Duplex Stainless Steel 2205, %
Carbon	≤0.03
Manganese	≤2.00
Silicon	≤1.00
Phosphate	≤0.03
Sulfur	≤0.02
Chromium	21.0-23.0
Nickel	4.5-6.5
Molybdenum	2.5-3.5
Nitrogen	0.08-0.2

2. Mechanical Properties of Duplex 2205

Tensile Strength	Yield Strength	Elongation	Rockwell	Charpy V-Notch Impact
ksi.(Mpa)	ksi. (Mpa)	%	Hardness	mm-N/mm2	mm-N/mm2
125(862)	90(621)	28	25C	1310	844

*All values are minimum unless otherwise specified.

3. Manufacture, Heat Treatment & Weldability

Duplex stainless steel 2205 can be manufactured from billets, bars, pipes, or tubes through forging, bending, extruding, or pressing process. It has better formability than that of the ferritic stainless steel grades, but not quite as good as the austenitic stainless steels. Duplex 2205 shall be solution-annealed at 1020-1100°C and then be quenched in air or water quickly. 2205 duplex stainless steel can be readily welded with GTAW, GMAW, plasma and SMAW welding methods. The alloy shall be welded without preheating, followed by cooling to at least 300°F[150°C] between each step. A welding procedure should be developed so that a ferrite content of 30-55% is present in the weld fusion and heat affected zones of the final welding.

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