2205 stainless steel
Standard No.: ASTM A240/A240M--01 2205 duplex stainless steel alloy is 21% chromium, 2.5% and 4.5% nickel-molybdenum alloy composition of nitrogen duplex stainless steel. It has high strength, good toughness and good overall and partial resistance to stress corrosion. 2205 duplex stainless steel is austenitic stainless steel yield strength twice, this feature allows designers to reduce weight in the design of products, so this alloy is more than 316,317 L has a price advantage. This alloy is particularly suitable for -50 ° F / +600 ° F temperature range. Beyond this temperature range applications, this alloy can also be considered, but there are some limitations, especially when applied to welded structures.
Features:
1 2205 duplex stainless steel alloy 316L and 317L austenitic stainless steels, 2205 is in the anti-pitting and crevice corrosion resistance superior to, it has high corrosion resistance, compared with the austenite, which lower coefficient of thermal expansion, thermal conductivity higher.
2 2205 duplex stainless steel alloy and austenitic stainless steels, it is twice the compressive strength, compared with 316L and 317L, designers can reduce their weight. 2205 is especially suitable for -50 ° F / +600 ° F temperature range, in strictly limited circumstances (particularly for welded structures) can also be used to lower the temperature.
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)
Applications
· Pressure vessels, storage tanks, pressure piping, heat exchangers (chemical processing industry).
· Oil and gas pipelines, heat exchanger tube.
· Sewage treatment system.
· Pulp and paper industry digesters, bleaching equipment, storage and processing system.
High strength and corrosion resistance of the rotary axis, press rolls, blades, impellers, etc.
· Ship or cargo tank truck
· Food processing equipment
Standard
ASTM/ASME...........A240 UNS S32205/S31803
EURONORM ........... 1.4462 X2CrNiMoN 22.5.3
AFNOR ................... Z3 CrNi 22.05 AZ
DIN ......................... W. Nr 1.4462
Corrosion resistance
Uniform corrosion
As the chromium content (22%), molybdenum (3%) and nitrogen content (0.18%), 2205 anti-corrosion properties than in most environments 316L and 317L.
Localized corrosion
18,920,675,058 2205 duplex stainless steel in the production of chromium, molybdenum and nitrogen to the oxidizing and acidic solutions, the pitting and crevice corrosion has a strong resistance.
Stress corrosion resistance
Duplex stainless steel microstructure help to improve resistance to stress corrosion cracking of stainless steel capacity. At a certain temperature, should be tension, oxygen and chlorides are present in the case of austenitic stainless steel will happen to chloride stress corrosion. Because of these conditions is not easy to control, 304L, 316L and 317L of limited use in this regard.
Corrosion fatigue
2205 dual-phase steel of high strength and corrosion resistance to high resistance to corrosion fatigue. Processing equipment susceptible to corrosion environment and the impact of load cycles, the characteristics of 2205 is ideal for such applications.
Structure
After 2205 the chemical composition of 1900 ° / 1922 ° F (1040 ° / 1080 ° C) annealing process, the availability of the desired microstructure of 50 α / 50 γ. If the heat treatment temperature is higher than 2000 ° F, may lead to the increase of ferrite components. The same as other duplex stainless steel, 2205 alloy susceptible to the effects of intermetallic phase precipitation. Intermetallic phase at 1300 ° F and 1800 ° F between precipitation, temperature at 1600 ° F, the fastest of its precipitation. Therefore, we need on the 2205 test, to ensure that no intermetallic phase, the test reference ASTM A 923.
Process
Hot forming
We recommend forming should be below the temperature at 600 ° F for. During the hot forming process, the entire piece should be the overall heat, should be 1750 ° F to 2250 ° F the temperature range, 2205 is very soft at this temperature. If the temperature is too high, 2205 is subject to hot tearing. If below this temperature, the austenite will be broken. Below 1700 ° F, due to the impact of temperature and deformation, the formation of intermetallic meet soon. Hot forming is done, should prompt a minimum at 1900 ° F temperature for annealing, and quench to restore phase balance, toughness and corrosion resistance. We do not recommend for stress relief, but if you have to do it, the material should be as low as 1900 ° F a temperature anneal, followed by rapid cooling or water quenching.
Cold forming
2205 can be cutting and cold forming. However, as of 2205 high strength and hardness, it is more necessary than the austenitic steel cold forming, but also because of its high strength, taking fully into account springback.
Heat treatment
2205 should be as low as 1900 ° F temperature annealing, followed by rapid cooling or water quenching. This treatment applies to both solution annealing and stress relieving. Stress relief treatments at temperatures below 1900 ° F under, easily lead to harmful metals or non-metallic phase precipitation.
Mechanical cutting of
In the high-speed machine, the feed rate of 2205 and the cutting speed and the 316L is the same. When carbide knife, cutting speed and 316L compared to about 20% lower, the performance of machinery and equipment and its components plays a key role in this.
Welding
2205 good weldability. 2205 performance to be achieved by thermal metamorphism weld metal and base metal parts remain the same and corrosion resistance, strength and toughness. 2205 welding difficult, but necessary to design welding procedures for welding, you can maintain good phase balance, to avoid the harmful metal phase or non-metallic phase precipitation. 2205 can be welded by: GTAW (TIG); GMAW (MIG); SMAW ("stick" electrode); SAW; FCW; and PAW
Standard No.: ASTM A240/A240M--01 2205 duplex stainless steel alloy is 21% chromium, 2.5% and 4.5% nickel-molybdenum alloy composition of nitrogen duplex stainless steel. It has high strength, good toughness and good overall and partial resistance to stress corrosion. 2205 duplex stainless steel is austenitic stainless steel yield strength twice, this feature allows designers to reduce weight in the design of products, so this alloy is more than 316,317 L has a price advantage. This alloy is particularly suitable for -50 ° F / +600 ° F temperature range. Beyond this temperature range applications, this alloy can also be considered, but there are some limitations, especially when applied to welded structures.
Features:
1 2205 duplex stainless steel alloy 316L and 317L austenitic stainless steels, 2205 is in the anti-pitting and crevice corrosion resistance superior to, it has high corrosion resistance, compared with the austenite, which lower coefficient of thermal expansion, thermal conductivity higher.
2 2205 duplex stainless steel alloy and austenitic stainless steels, it is twice the compressive strength, compared with 316L and 317L, designers can reduce their weight. 2205 is especially suitable for -50 ° F / +600 ° F temperature range, in strictly limited circumstances (particularly for welded structures) can also be used to lower the temperature.
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)
Applications
· Pressure vessels, storage tanks, pressure piping, heat exchangers (chemical processing industry).
· Oil and gas pipelines, heat exchanger tube.
· Sewage treatment system.
· Pulp and paper industry digesters, bleaching equipment, storage and processing system.
High strength and corrosion resistance of the rotary axis, press rolls, blades, impellers, etc.
· Ship or cargo tank truck
· Food processing equipment
Standard
ASTM/ASME...........A240 UNS S32205/S31803
EURONORM ........... 1.4462 X2CrNiMoN 22.5.3
AFNOR ................... Z3 CrNi 22.05 AZ
DIN ......................... W. Nr 1.4462
Corrosion resistance
Uniform corrosion
As the chromium content (22%), molybdenum (3%) and nitrogen content (0.18%), 2205 anti-corrosion properties than in most environments 316L and 317L.
Localized corrosion
18,920,675,058 2205 duplex stainless steel in the production of chromium, molybdenum and nitrogen to the oxidizing and acidic solutions, the pitting and crevice corrosion has a strong resistance.
Stress corrosion resistance
Duplex stainless steel microstructure help to improve resistance to stress corrosion cracking of stainless steel capacity. At a certain temperature, should be tension, oxygen and chlorides are present in the case of austenitic stainless steel will happen to chloride stress corrosion. Because of these conditions is not easy to control, 304L, 316L and 317L of limited use in this regard.
Corrosion fatigue
2205 dual-phase steel of high strength and corrosion resistance to high resistance to corrosion fatigue. Processing equipment susceptible to corrosion environment and the impact of load cycles, the characteristics of 2205 is ideal for such applications.
Structure
After 2205 the chemical composition of 1900 ° / 1922 ° F (1040 ° / 1080 ° C) annealing process, the availability of the desired microstructure of 50 α / 50 γ. If the heat treatment temperature is higher than 2000 ° F, may lead to the increase of ferrite components. The same as other duplex stainless steel, 2205 alloy susceptible to the effects of intermetallic phase precipitation. Intermetallic phase at 1300 ° F and 1800 ° F between precipitation, temperature at 1600 ° F, the fastest of its precipitation. Therefore, we need on the 2205 test, to ensure that no intermetallic phase, the test reference ASTM A 923.
Process
Hot forming
We recommend forming should be below the temperature at 600 ° F for. During the hot forming process, the entire piece should be the overall heat, should be 1750 ° F to 2250 ° F the temperature range, 2205 is very soft at this temperature. If the temperature is too high, 2205 is subject to hot tearing. If below this temperature, the austenite will be broken. Below 1700 ° F, due to the impact of temperature and deformation, the formation of intermetallic meet soon. Hot forming is done, should prompt a minimum at 1900 ° F temperature for annealing, and quench to restore phase balance, toughness and corrosion resistance. We do not recommend for stress relief, but if you have to do it, the material should be as low as 1900 ° F a temperature anneal, followed by rapid cooling or water quenching.
Cold forming
2205 can be cutting and cold forming. However, as of 2205 high strength and hardness, it is more necessary than the austenitic steel cold forming, but also because of its high strength, taking fully into account springback.
Heat treatment
2205 should be as low as 1900 ° F temperature annealing, followed by rapid cooling or water quenching. This treatment applies to both solution annealing and stress relieving. Stress relief treatments at temperatures below 1900 ° F under, easily lead to harmful metals or non-metallic phase precipitation.
Mechanical cutting of
In the high-speed machine, the feed rate of 2205 and the cutting speed and the 316L is the same. When carbide knife, cutting speed and 316L compared to about 20% lower, the performance of machinery and equipment and its components plays a key role in this.
Welding
2205 good weldability. 2205 performance to be achieved by thermal metamorphism weld metal and base metal parts remain the same and corrosion resistance, strength and toughness. 2205 welding difficult, but necessary to design welding procedures for welding, you can maintain good phase balance, to avoid the harmful metal phase or non-metallic phase precipitation. 2205 can be welded by: GTAW (TIG); GMAW (MIG); SMAW ("stick" electrode); SAW; FCW; and PAW
