2205 stainless steel is a duplex stainless steel, also known as a duplex alloy. It is composed of approximately 17-19% chromium, approximately 4-6% nickel, approximately 3% molybdenum, and approximately 0.08-0.20% nitrogen.
2205 stainless steel nicknames include:
22Cr-5Ni-3Mo-0.15N stainless steel - named based on its chemical composition.
UNS S32205 stainless steel - a stainless steel grade (UNS) that meets the standards of the American Society.
SAF 2205 stainless steel - safety recommendations for stainless steel used in marine and chemical applications.
EN 1.4462 Stainless Steel - Grade of stainless steel according to European standards (EN).
Chemical composition of 2205 duplex stainless steel:
Chromium (Cr): 22% -23%
Nickel (Ni): 4.5% -6.5%
Molybdenum (Mo): 3% -3.5%
Manganese (Mn): 2% maximum
Silicon (Si): 1% maximum
Phosphorus (P): 0.03% maximum
Sulfur (S): 0.02% maximum
Nitrogen (N): 0.14% maximum
Mechanical properties of 2205 duplex stainless steel:
Yield strength: 690 MPa
Tensile strength: 880 MPa
Elongation: 25% minimum
Hardness: ≤ 290 HB
Physical properties of 2205 duplex stainless steel:
Density: 7.8 g/cm ³
Melting point: 1398-1446 ℃
Coefficient of thermal expansion: 13.7 x 10 ^ - 6/K (in the range of 20 ℃ to 100 ℃)
Thermal conductivity: 13.7 W/mK (at 100 ℃)
Conductivity: 14.7 W/mK
Magnetic permeability: 1.02 H/m
2205 stainless steel is a duplex stainless steel made by mixing various metal elements such as chromium, nickel, and molybdenum. The following are the advantages and disadvantages of this type of stainless steel:
advantage:
High corrosion resistance: 2205 stainless steel has excellent corrosion and oxidation resistance in some acidic or alkaline environments due to the presence of corrosion-resistant elements such as Cr, Mo, Ni, etc.
High mechanical strength: Due to the dual phase structure of 2205 stainless steel, its strength is greater than that of ordinary austenitic stainless steel.
Excellent toughness: Generally speaking, 2205 stainless steel has better toughness than 304 and 316 stainless steel, with higher crack propagation resistance and fatigue strength.
High cost-effectiveness: Compared to high-end stainless steel, the price of 2205 stainless steel is relatively low.
Disadvantages:
2205 stainless steel is more difficult to machine and form than austenitic stainless steel, therefore it requires stronger force and heat during the manufacturing process.
If forging is carried out at a transition temperature, it may cause material fracture, so caution must be exercised during processing and manufacturing.
There is still room for improvement in the corrosion resistance of this type of stainless steel compared to general stainless steel in high-temperature environments.
Compared to austenitic stainless steel, its high content of elements makes the recovery and reprocessing process more difficult.
Overall, 2205 stainless steel has many advantages and some disadvantages, but it has been widely used in many industries, such as marine engineering, chemical engineering, petroleum, and natural gas.