UNS S32205 (2205 Duplex Stainless Steel)

Description

Special properties:

Alloy 2205 duplex stainlesssteel plate is a 22% Chromium, 3% Molybdenum, 5-6% Nickel nitrogen alloyed duplex stainless steel plate with high general, localized and stress corrosion resistance properties in addition to high strength and excellent impact toughness.

Alloy 2205 duplex stainlesssteel plate provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steels in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic.

The yield strength is about twice that of austenitic stainless steels. This allows a designer to save weight and makes the alloy more cost competitive when compared to 316L or 317L.

Alloy 2205 duplex stainlesssteel plate is particularly suitable for applications covering the -50°F/+600°F temperature range. Temperatures outside this range may be considered but need some restrictions, particularly for welded structures.

2205 Duplex Stainless SteelChemical composition:

C	Si	Mn	Ni	P	S	Cr	Mo	N
max   0.03	max   1	max   2	4.5 – 6.5	max   0.035	max   0.015	21 – 23	2.5 – 3.5	0.1 – 0.22

2205 Duplex Stainless Steel Mechanical Properties:

Density, g/cm³	7,805
Melting range, °C	1300-1390

2205 Duplex StainlessSteel Physical properties:

Material	Tensile Strength MPa	Yield Strength (0.2% Offset) MPa	Elongation (%)
2205	620	450	25

2205 Duplex Stainless Steel ASTM Specifications：

Pipe Smls	Pipe Welded	Tube Smls	Tube Welded	Sheet/Plate	Bar	Flanges, Fittings & Valves
A790	A790	A789	A789	A240	A276	A182

Heat Resistance

Although 2205 has good high temperature oxidation resistance, this grade, like other duplex stainless steels, suffers from embrittlement if held for even short times at temperatures above 300^oC. If embrittled this can only be rectified by a full solution annealing treatment. 2205 is annealed at 1020-1100^oC followed by rapid cooling. This treatment applies for both solution annealing and stress relieving.

Structure

The chemical analysis of 2205 duplex stainlesssteel plate is optimized to obtain a typical 50 a/ 50 g microstructure after solution annealing treatment at 1900°/1922°F (1040°/1080°C).

Chloride Pitting Resistance

The pitting resistance of an austenitic stainless steel can be related directly to alloy composition, where chromium, molybdenum and nitrogen are a weight %. The Pitting Resistance Equivalent Number (PREN) uses the following formula to measure an alloy’s relative pitting resistance – the higher the number, the better the pitting resistance.

2205 Duplex Stainless Steel Applications

• Chemical process vessels, piping and heat exchangers

• Pulp mill digesters, bleach washers, chip pre-steaming vessels

• Food processing equipment

• Oil field piping and heat exchangers

• Flue gas desulfurization equipment