What is the 2205 stainless steel?
Duplex stainless steel 2205 alloy is made of 21% chromium, 2.5% nitrogen and 4.5% molybdenum nickel alloy consisting of duplex stainless steel. It has high strength, good impact toughness and good overall and partial stress corrosion resistance.
Features:
1). 2205 duplex stainless steel alloy with 316
l and 317 l austenitic stainless steel, alloy 2205 in pitting corrosion and
crevice corrosion resistance is superior, it has the very high corrosion
resistance, compared with austenitic, its lower thermal expansion coefficient,
thermal conductivity is higher.
2). 2205 duplex stainless steel alloy compared
with austenitic stainless steel, its compressive strength is its two times,
compared with 316 l and 317 l, designers can reduce the weight.Especially
suitable for 2205 alloy + 50 ° F / 600 ° F temperature range, in the case of
restricted (especially for welding structure), can also be used to lower the temperature.
Chemical composition: C or less 0.030 Mn Si
acuities were 2.00 2.00 p 0.030 S or less or less acuities were 0.020 to 22.0 ~
23.0 Ni Cr 4.5 ~ 6.5 N0.14 Mo3.0 ~ 3.5 ~ 3.5 (austenitic - iron grain size)
The corrosion resistance of the dual phase steel 2205:
1). The uniform corrosion
Because of the chromium content (22%),
molybdenum (3%) and nitrogen content (0.18%), corrosion resistant properties of
2205 in most circumstances is better than 316 l and 317 l.
2). Local corrosion
Dual phase steel 2205 of chromium, molybdenum
and nitrogen content in the oxidation and acid solution, the corrosion and the
gap has a strong ability to resist corrosion.
3). Stress corrosion resistance
Stainless steel duplex microstructure helps to
improve the ability of resistance to stress corrosion cracking of stainless
steel.In a certain temperature, tension, the presence of oxygen and chlorine,
austenitic stainless steel chloride stress corrosion will happen.As a result of
these conditions is not easy to control, so the use of 304 l, 316 l and 317 l
in this area is restricted.
4. The corrosion fatigue
Dual phase steel 2205 high strength and
corrosion resistance make it has a high resistance to corrosion fatigue
strength.Processing equipment are susceptible to corrosion environment and the
influence of the loading cycle, the characteristics of 2205 is very suitable
for such applications.
2205 the structure of dual phase steel:
The chemical composition of 2205 dual phase steel after 1900 ° / 1922 ° F (1040 ° / 1080 ° C) solid after annealing treatment, can obtain ideal microstructure 50 alpha / 50 gamma.If the heat treatment temperature higher than 2000 ° F, may cause the ferrite components increase.Like the rest of the duplex stainless steel, alloy 2205 vulnerable to the influence of the phase separation of the metal.Intermetallic phase between 1300 ° and 1800 ° F F precipitation, under the temperature of 1600 ° F, the fastest precipitation.Therefore, we need to test 2205, ensure no intermetallic phase, and ASTM A 923 test reference.
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