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| Availability: | |
|---|---|
| Quantity: | |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
|---|---|---|---|---|---|---|---|---|---|
| 2205 (S31803) | ≤0.03 | ≤2.0 | ≤1.0 | ≤0.030 | ≤0.020 | 21.0–23.0 | 2.5–3.5 | 4.5–6.5 | 0.08–0.20 |
| 2205 (S32205) | ≤0.03 | ≤2.0 | ≤1.0 | ≤0.030 | ≤0.020 | 21.0–23.0 | 3.0–3.5 | 4.5–6.5 | 0.14–0.20 |
| Property | Value |
|---|---|
| Tensile Strength | 650–880 MPa |
| Yield Strength (0.2% offset) | ≥450 MPa |
| Elongation | ≥25% |
| Hardness (HB) | ≤270 HB |
| Elastic Modulus | 200 GPa |
| Property | Value |
|---|---|
| Density | 7.805 g/cm³ |
| Thermal Conductivity | 19.0 W/m·K |
| Thermal Expansion | 13.7×10⁻⁶/K |
| Electrical Resistivity | 0.85×10⁻⁶ Ω·m |
| Melting Point | 1400–1450°C |
Diameter Range: 6–300 mm
Length: Customizable (up to 12 meters standard)
Tolerance: ±0.05 mm (cold-drawn); ±0.1 mm (hot-rolled)
| Parameter | Duplex 2205 (S31803) | Austenitic 316L (S31603) | Super Duplex 2507 (S32750) |
|---|---|---|---|
| Microstructure | Austenitic-ferritic | Fully austenitic | Austenitic-ferritic |
| Yield Strength | ≥450 MPa | ≥170 MPa | ≥550 MPa |
| Cr Content | 21–23% | 16–18% | 24–26% |
| Mo Content | 2.5–3.5% | 2.0–3.0% | 3.0–5.0% |
| N Content | 0.08–0.20% | – | 0.24–0.32% |
| Chloride SCC Resistance | Good | Moderate | Excellent |
| Service Temperature | -40°C to 250°C | -196°C to 800°C | -50°C to 300°C |
| Typical Applications | Offshore, chemical | General corrosion | Extreme marine, oil & gas |
Duplex 2205 offers 2.5x the yield strength of 316L, reducing material thickness and weight.
Super Duplex 2507 outperforms 2205 in severe chloride environments but at higher cost.
Chloride Stress Corrosion Cracking (SCC): Resists SCC in seawater, brine, and chloride-rich media, making it ideal for offshore and marine applications.
Pitting & Crevice Corrosion: High chromium, molybdenum, and nitrogen content provide superior resistance to localized corrosion compared to austenitic steels.
Acid & Alkali Resistance: Performs well in mild acids (e.g., sulfuric, phosphoric) and alkaline solutions, suitable for chemical processing.
Mechanical Advantage: With yield strength ≥450 MPa, Duplex 2205 allows for lighter component designs while maintaining structural integrity.
Toughness: Retains ductility at low temperatures, preventing brittleness in cryogenic applications.
Weight Savings: Higher strength enables thinner sections, reducing material and transportation costs.
Longevity: Reduced maintenance and replacement needs due to superior corrosion resistance.
Weldability: Can be welded by TIG, MIG, and stick welding methods with proper filler metals (e.g., ER2209).
Machinability: Requires slightly slower speeds than austenitic steels but offers good formability and cutting performance.
Subsea Equipment: Pipelines, valves, and wellheads exposed to seawater and corrosive hydrocarbons.
Platform Structures: Support beams and components in marine environments.
Reactors & Vessels: Handling acids, chlorides, and other corrosive chemicals.
Heat Exchangers: Efficient heat transfer with resistance to fouling and corrosion.
Desalination Plants: Heat exchangers and pipes in seawater treatment systems.
Shipbuilding: Propulsion systems, hull components, and seawater piping.
Flue Gas Desulfurization (FGD): Scrubbers and ducts in coal-fired power plants.
Geothermal Energy: Tubing for high-temperature, acidic geothermal fluids.
Hygienic Equipment: Brewing tanks, dairy processing lines, and equipment requiring corrosion resistance and easy cleaning.
Nitrogen Content: S32205 has higher nitrogen (0.14–0.20%) for enhanced strength and corrosion resistance.
Mo Content: S32205 contains 3.0–3.5% molybdenum (vs. 2.5–3.5% in S31803), improving pitting resistance.
