Duplex 2205 is a compound stainless steel composed of 21% chromium, 2.5% molybdenum and 4.5% nickel-nitrogen alloy. It has high strength, good impact toughness and good overall and local stress corrosion resistance.
1.Duplex 2205 alloy compared with 316L and 317L austenitic stainless steel, 2205 alloy is superior in terms of resistance to pitting and crevice corrosion, it has a high corrosion resistance, compared with austenite, it has a lower coefficient of thermal expansion and higher thermal conductivity.
2.Duplex stainless steel 2205 alloy is twice as strong as austenitic stainless steel, compared with 316L and 317L, the designer can reduce its weight. 2205 alloy is particularly suitable for -50 °F/+600 °F temperature range, in the case of strict restrictions (especially for welded structures), can also be used for lower temperatures.
Chemical composition: C ≤ 0.030 Mn ≤ 2.00 Si ≤ 1.00 p ≤ 0.030 S ≤ 0.020 Cr 22.0 ~ 23.0 Ni 4.5 ~ 6.5 Mo3.0 ~ 3.5 N0.14 ~ 0.20 (austenitic-ferritic type)
Duplex 2205 is a duplex stainless steel composed of 22% chromium,3% molybdenum and 5-6% nickel-nitrogen. It has high strength, good impact toughness and good overall and local stress corrosion resistance. Compared with 316L and 317L austenitic stainless steel, 2205 alloy has superior performance in pitting and gap corrosion resistance, it has high corrosion resistance, lower coefficient of thermal expansion and higher thermal conductivity compared to austenitic.
The yield strength of Duplex 2205 is twice that of austenitic stainless steel, a property that allows designers to design products with less weight, giving this material a price advantage over 316, 317L. This material is particularly suitable for use in the -50°F/+600°F temperature range. Applications beyond this temperature range may also consider this material, but there are some limitations, especially when applied to welded structures.
1.Pressure vessels, high pressure storage tanks, high pressure piping, heat exchangers (chemical processing industry).
2.Oil and gas pipelines, heat exchanger fittings.
3.Wastewater treatment systems.
4.Pulp and paper industry classifiers, bleaching equipment, storage and handling systems.
5.High strength and corrosion resistant environments for rotary shafts, press rolls, blades, impellers, etc.
6.Cargo boxes for ships or trucks
7.Food processing equipment
ASTM/ASME...........A240 UNS S32205/S31803
EURONORM...........1.4462 X2CrNiMoN 22.5.3
AFNOR...................Z3 CrNi 22.05 AZ
DIN.........................W. Nr 1.4462
Uniform corrosion: Due to the chromium content (22%), molybdenum (3%) and nitrogen content (0.18%), duplex 2205 has better corrosion resistance than 316L and 317L in most environments.
Localized corrosion resistance: The chromium, molybdenum and nitrogen content of duplex 2205l makes it highly resistant to pitting and gap corrosion in oxidizing and acidic solutions.
Stress corrosion resistance: The duplex microstructure of stainless steel helps to improve the resistance of stainless steel to stress corrosion cracking. At a certain temperature, stress tension, oxygen and the presence of chlorides, austenitic stainless steel will occur chloride stress corrosion. Since these conditions are not easily controlled, the use of 304L, 316L and 317L is limited in this regard.
Corrosion fatigue resistance: The high strength and corrosion resistance of duplex 2205 gives it a high corrosion fatigue resistance. Processing equipment is susceptible to corrosive environments and loading loops, and the properties of duplex 2205 are well suited for such applications.
The chemical composition of duplex 2205 is annealed at 1900°/1922°F (1040°/1080°C) to obtain the desired microstructure of 50 α / 50 γ. If the heat treatment temperature is higher than 2000°F, it may lead to an increase in ferrite composition. Like other duplex stainless steels, duplex 2205 is susceptible to intermetallic phase precipitation. The intermetallic phase precipitates between 1300°F and 1800°F, with the fastest rate of precipitation occurring at 1600°F. Therefore, we need to test 2205 to ensure that it is free of intermetallic phases, referring to ASTM A 923.
The feed rate and cutting speed of duplex 2205 is the same as 316L on a high speed machine. If a carbonized knife is used, the cutting speed is reduced by approximately 20% compared to 316L, where the performance of the machine and its components play a key role.
Duplex 2205 is very weldable.Duplex 2205 is intended to have properties such that the weld metal and thermally deteriorated parts retain the same corrosion resistance, strength and toughness as the base metal. Duplex 2205 is not very difficult to weld, but the welding procedure needs to be designed so that after welding, a good phase equilibrium can be maintained to avoid the precipitation of harmful metallic or non-metallic phases. Duplex 2205 can be welded in the following GTAW (TIG); GMAW (MIG); SMAW; SAW; FCW; and PAW.
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