Standard: ASTM A240 / A240M- 01 Duplex stainless steel 2205 alloy
is duplex stainless steel consisting of 22% chromium, 2.5% nitrogen
and 4.5% molybdenum nickel alloy . It has high strength, good
impact toughness and good stress corrosion resistance of global and
local . The yield strength of 2205 duplex stainless steel is twice
that of austenitic stainless steel, this feature makes the designer
can lose weight when designing products , make this alloy have an
advantage compare with316,317Lin price. This alloy is particularly
suited to - + 50 ° F / 600 ° F temperature range. Beyond the
temperature range, also can consider this kind of alloy, but there
are some limitations, especially when applied to the welding
·Pressure vessels, tanks, high pressure pipes, heat exchangers,
chemical processing industry).
·Oil and gas pipelines, heat exchanger fittings.
·Sewage treatment system
·Pulp and paper industry classifier and bleaching equipment, storage
·High strength of rotating shaft corrosion environment, squeezing
rollers, blades, impeller, etc.
·Cargo box of a ship or truck
·food processing equipment
Grade of Different Standard
ASTM/ASME...........A240 UNS S32205/S31803
AFNOR...................Z3 Cr Ni 22.05 AZ
DIN.........................W. Nr 1.4462
Because of the content of chrome , molybdenum and nitrogen is 22%
,3% and 0.18%, the corrosion resistant of2205 inmost of the
environment is better than316Land317L.
Due to the content ofchromium, molybdenum and nitrogen , 2205 duplex stainless steel,
has a strong corrosion resistance to the pitting corrosion and crack corrosionin the oxidation and acid solution.
Resistance to stress corrosion
Duplex microstructure of Stainless steel is helpful to improve the
ability of the resistance to stress corrosion cracking . In a
presence of certain temperature, oxygen tension, and the chloride,
chloride stress corrosion will happen on austenitic stainless
steel. Because of these conditions is not easy to control, the use
of304 l,316 land317 lis limited in this respect.
Thehigh strength and corrosion resistance of dual phase steel 2205,
make it has high resistance to corrosion fatigue strength.
Processing equipment susceptible to corrosion environment and the
influence of the loading cycle, the 2205 is very suitable for such
The chemical composition of 2205 after a 1900 ° 1900 ° F (1040 ° or
1080 ° C) solid annealing treatment, can obtain ideal
microstructure 50 alpha / 50 gamma. If the heat treatment
temperature higher than 2000 ° F, may result in ferritic components
increase. Like the rest of the duplex stainless steel, alloy 2205
is easy affected by intermetallic phase precipitation.
Intermetallic phase between 1300 ° and 1800 ° F precipitation,
under temperature of 1600 ° F, the precipitation speed is the
fastest. Therefore, we need to test 2205, ensure no intermetallic
phase, test refer to ASTM A 923.
1.Compared with 316 L and317Laustenitic stainless steel, 2205 alloy
have a superior performance in the resistance to pitting corrosion
and crevice corrosion.Compared with the austenitic,it has lower
thermal expansion coefficient, so thermal conductivity is higher.
2.The compressive strength duplex stainless steel 2205 alloy is two
times of austenitic stainless steel, compared with 316Land317L, the
designer can reduce the weight. The temperature range + 50 ° F /
600 ° F , is especially suitable for 2205 alloy , under the
condition of the strictly limited (especially for welding
structure), can also be used to the lower temperature.
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 - iron grain size）
Performance added：Dominant sector：22Cr-5.3Ni-3.2Mo-0.16N；Grade：NAS 329J3L、UNS S32205/S31803、DIN/EN 1.4462、ASTM A240、ASME SA-240；Mechanical properties：Tensile Strength：σb≥640Mpa；Elongation：δ≥25%；Conditions：20%dilute sulphuric acid ,Below60℃，Annual corrosion rate:<0.1mm；Form a complete set of welding wire:ER2209。
1、Chemical Component （JIS G 4305- 005）(wt%)
2、Property（JIS G 4305-2005）
Mechanical Property of Duplex Stainless Steel2205
Mechanical Property of Duplex Stainless Steel2205 InHigh