Hangbo Alloy Group supplies a variety of 2205 duplex stainless steel products, including round bars, plates, strips, seamless tubes, forgings, and wires. Below is a comprehensive description of 2205 duplex stainless steel.
1.Introduction to 2205 Duplex Stainless Steel
Description: 2205 (UNS S31803/S32205) is a classic austenitic-ferritic duplex stainless steel, mainly composed of chromium, nickel, molybdenum, and nitrogen. It is renowned for its unique dual-phase structure (~50% austenite + ~50% ferrite), which combines the corrosion resistance of austenitic stainless steel and the high strength of ferritic stainless steel. It exhibits excellent resistance to chloride stress corrosion cracking (SCC), good mechanical properties in a wide temperature range (-50°C to 300°C), and high tensile strength (≥620 MPa). These characteristics make it ideal for harsh environments with corrosive media (especially chloride-containing) and high structural load requirements.
International Equivalents:
USA: S32205, ASTM 2205
CHINA: 022Cr23Ni5Mo3N (per GB/T 20878 standard)
Europe: EN 1.4462, DIN X2CrNiMoN22-5-3
2.Standards for 2205 Duplex Stainless Steel Products
Plates: ASTM A240/A240M (Grade 2205), GB/T 4237, EN 10088-2
Round Bars: ASTM A276 (Grade 2205), GB/T 1220, EN 10088-3
Seamless Tubes: ASTM A312/A312M (Grade 2205), GB/T 14976, EN 10216-5
Forgings: ASTM A182/A182M (Grade 2205), GB/T 1221, EN 10222-5
3.Chemical Composition of 2205 Duplex Stainless Steel
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Chromium (Cr) | 22.0-23.0 |
| Nickel (Ni) | 4.5-6.5 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.02 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 3.0-3.5 |
| Nitrogen(N) | 0.14-0.2 |
4. Physical Properties of 2205 Duplex Stainless Steel
| Property | Value |
|---|---|
| Density | 7.98 g/cm³ |
| Melting Range | 1300 - 1390 °C |
5.Material Characteristics of 2205 Duplex Stainless Steel
Excellent Chloride Corrosion Resistance: Outstanding resistance to chloride stress corrosion cracking (SCC) and pitting/crevice corrosion (critical advantage over austenitic steels like 304/316); suitable for seawater, brine, and chloride-containing chemical media.
High Mechanical Strength: Tensile strength (≥620 MPa) and yield strength (≥450 MPa) are 1.5-2 times higher than 304/316 stainless steel; reduces component thickness and weight, lowering overall costs.
Balanced Dual-Phase Structure: ~50% austenite + ~50% ferrite ensures good toughness (especially low-temperature toughness, no brittle fracture at -50°C) and fatigue resistance, avoiding the brittleness of single-phase ferritic steels.
Good Weldability: Compatible with standard welding methods (TIG, MIG, submerged arc welding); controlled heat input (avoiding overheating) maintains post-weld dual-phase balance and corrosion resistance; no need for post-weld heat treatment in most cases.
Medium-Temperature Stability: Maintains stable mechanical properties and corrosion resistance at temperatures up to 300°C; avoids phase transformation or performance degradation under long-term medium-temperature service.
6.Applications of 2205 Duplex Stainless Steel
Seawater Desalination Industry: Widely used in reverse osmosis (RO) membrane housings, seawater intake pipelines, and desalination plant heat exchangers; resists long-term seawater erosion and chloride stress corrosion.
Oil & Gas Industry: Applied to offshore platforms (structural components, pipelines), subsea wellhead equipment, and oilfield chemical tanks; withstands harsh marine environments and corrosive oilfield media (e.g., hydrogen sulfide, chlorides).
Chemical Industry: Used in chloride-containing chemical reactors, acid-resistant pipelines (e.g., hydrochloric acid, sulfuric acid solutions), and fertilizer production equipment; avoids pitting and crevice corrosion in strong corrosive environments.
Municipal & Environmental Engineering: Employed in sewage treatment plants (aeration tanks, sludge pipelines) and waste incineration flue gas treatment systems; resists corrosion from acidic sewage and harmful gases.
Marine Engineering: Used in ship hulls (seawater contact parts), propeller shafts, and marine heat exchangers; combines high strength and seawater corrosion resistance, extending service life of marine equipment.
