Products Description

Alloy 2205 (UNS S32305/S31803) is a duplex stainless steel plate that offers a combination of excellent corrosion resistance, high strength, and good impact toughness. Here are some key points about Alloy 2205 duplex stainless steel plate:Alloy 2205 consists of 22% chromium, 3% molybdenum, 5-6% nickel, and nitrogen as alloying elements.The duplex microstructure of the alloy, with a balanced combination of ferrite and austenite phases, contributes to its unique properties.Alloy 2205 provides superior pitting and crevice corrosion resistance compared to austenitic stainless steels such as 316L or 317L in a wide range of corrosive media.It exhibits excellent resistance to general corrosion and localized corrosion, making it suitable for applications in aggressive environments.Alloy 2205 offers high strength, allowing it to withstand heavy loads and pressures.It demonstrates excellent impact toughness, making it resistant to brittle fracture even at low temperatures.The alloy possesses high corrosion and erosion fatigue properties, making it suitable for applications subject to cyclic loading and corrosive environments.Alloy 2205 has lower thermal expansion compared to austenitic stainless steels, which can be beneficial in certain applications.It also exhibits higher thermal conductivity, facilitating efficient heat transfer.Alloy 2205 duplex stainless steel plate finds applications in various industries, including chemical processing, oil and gas, pulp and paper, and marine environments. It is commonly used in equipment such as pressure vessels, heat exchangers, pipes, and structural components.As always, it's important to consider specific operating conditions and consult with materials engineers or alloy manufacturers for precise guidance on the use, fabrication, and compatibility of Alloy 2205 in particular applications and environments.

General Properties

 Alloy 2205 duplex stainless steel plate offers a range of advantageous properties. Here are some additional details:Composition:Alloy 2205 is composed of 22% chromium, 3% molybdenum, 5-6% nickel, and nitrogen as alloying elements.The duplex microstructure, consisting of both ferrite and austenite phases, contributes to its unique properties.

Corrosion Resistance:

Alloy 2205 provides superior pitting and crevice corrosion resistance compared to austenitic stainless steels like 316L or 317L in most corrosive environments.

It exhibits excellent resistance to general corrosion and localized corrosion, making it suitable for a wide range of applications.

Mechanical Properties:

The yield strength of Alloy 2205 is approximately twice that of austenitic stainless steels, allowing for weight savings and cost competitiveness.

The alloy possesses high strength and excellent impact toughness, making it suitable for demanding applications.

Fatigue Properties:

Alloy 2205 offers high corrosion and erosion fatigue properties, making it suitable for applications subjected to cyclic loading and corrosive environments.

Thermal Properties:

Alloy 2205 has lower thermal expansion and higher thermal conductivity compared to austenitic stainless steels, which can be advantageous in certain applications.

Temperature Range:

Alloy 2205 is particularly suitable for applications within the temperature range of -50°F to +600°F (-46°C to +316°C).While the alloy can be considered for temperatures outside this range, some restrictions may apply, especially for welded structures.

Alloy 2205 duplex stainless steel plate finds applications in various industries, including chemical processing, oil and gas, pulp and paper, and marine environments. It is commonly used in equipment such as pressure vessels, heat exchangers, pipes, and structural components.

Corrosion Resistance

General Corrosion
Because of its high chromium (22%), molybdenum (3%), and nitrogen (0.18%) contents, the corrosion resistance properties of 2205 duplex stainless steel plate are superior to that of 316L or 317L in most environments.
Localized Corrosion Resistance
The chromium, molybdenum, and nitrogen in 2205 duplex stainless steel plate also provide excellent resistance to pitting and crevice corrosion even in very oxidizing and acidic solutions.

Isocorrosion Curves 4 mpy (0.1 mm/yr), in sulfuric acid solution containing 2000 ppm
Stress Corrosion Resistance
The duplex microstructure is known to improve the stress corrosion cracking resistance of stainless steels.
Chloride stress corrosion cracking of austenitic stainless steels can occur when the necessary conditions of temperature, tensile stress, oxygen, and chlorides are present. Since these conditions are not easily controlled, stress corrosion cracking has often been a barrier to utilizing 304L, 316L, or 317L.
Corrosion Fatigue Resistence
Alloy 2205 duplex stainless steel plate combines high strength and high corrosion resistance to produce high corrosion fatigue strength. Applications in which processing equipment is subject to both an aggresively corrosive enviroment and to cycle loading can benefit from the properties of 2205 duplex stainless steel plate.

Critical Crevice Corrosion Temperature (CCT) in 10% FeCl3•6H2O

Corrosion Rate, ipy
Grade			Solution A, 1401/4F			Solution B, 1201/4F
2205			3.1			3.9
316L			>200			>200
904L			47			6.3
Composition, wt%
P2O5	HCl	HF	H2SO4	Fe2O3	Al203	SiO2	CaO	MgO
Sol A 54.0	0.06	1.1	4.1	0.27	0.17	0.10	0.20	0.70
Sol B 27.5	0.34	1.3	1.72	0.4	0.001	0.3	0.02	—

Stress Corrosion Cracking Resistance

	Boiling	Wick	Boiling
Grade	42% MgCl2	Test	25% NaCl
2205	F	P	P
254 SMO®	F	P	P
Type 316L	F	F	F
Type 317L	F	F	F
Alloy 904L	F	P or F	P or F
Alloy 20	F	P	P

 (P = Pass, F = Fail)

Chemical Analysis

Typical Values (Weight %)

Carbon	Chromium	Nickel	Molybdenum	Nitrogen	Others
0.020	22.1	5.6	3.1	0.18	S=0.001
PREN = [Cr%] = 3.3 [Mo%] = 16 [N%] ≥ 34

Physical Properties

Mechanical Properties