2205 duplex stainless steel is a duplex stainless steel composed of 21% chromium, 2.5% molybdenum and 4.5% nickel-nitrogen alloy. The ferrite and austenite structures each account for approximately 50%. It has high strength, good impact toughness and good overall and local stress corrosion resistance. The yield strength of 2205 duplex stainless steel is twice that of austenitic stainless steel. This feature enables designers to reduce weight when designing products, making this alloy more cost-effective than 316 and 317L. This alloy is particularly suitable for the temperature range of -50°F/+600°F. For applications beyond this temperature range, this alloy can also be considered, but there are some limitations, especially when applied to welded structures.
Chemical Composition:
- C: ≤ 0.03
- Mn: ≤ 2.00
- Si: ≤ 1.00
- P: ≤ 0.03
- S: ≤ 0.02
- Cr: 22.0～23.0
- Ni: 4.5～6.5
- Mo: 3.0～3.5
- N: 0.14～0.20
Equivalent Grades:
2205 duplex steel, UNS S32205, NAS 329J3L, F51, W.-Nr. 1.4462, 00Cr22Ni5Mo3N
Executive Standards:
ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASMES A312
Physical Properties:
- Density: 7.98 g/cm3
- Melting point: 1300 - 1390 ℃
Solution Heat Treatment:
Hold the temperature between 1000 - 1050℃ for 1-2 hours, fast air cooling or water cooling.
Mechanical Properties:
- Tensile Strength: σb≥795Mpa
- Yield Strength: σb≥550Mpa
- Elongation: δ≥15%
- Hardness ≤310 (HB)
Corrosion Resistance and Use Environment:
Compared with 316L and 317L austenitic stainless steel, 2205 duplex stainless steel has superior performance in resistance to pitting corrosion and crevice corrosion. It has high corrosion resistance. Compared with austenitic, its The coefficient of thermal expansion is lower and the thermal conductivity is higher. Compared with austenitic stainless steel, duplex stainless steel 2205 alloy has twice its compressive strength. Compared with 316L and 317L, the designer can reduce its weight. Alloy 2205 is especially suitable for the temperature range of -50°F/+600°F. Under strict restrictions (especially for welded structures), it can also be used at lower temperatures.
Applications of 2205 DSS Castings:
- Oil and gas industry equipment;
- Offshore platforms, heat exchangers, underwater equipment, fire fighting equipment;
- Chemical processing industry, utensils and pipeline industry;
- Desalination, high-pressure RO equipment and submarine pipelines;
- Energy industry such as power plant desulfurization and denitration FGD system, industrial scrubbing system, absorption tower;
- Mechanical parts (high-strength, corrosion-resistant, wear-resistant parts)
Post time: Aug-18-2021