Duplex 2205/31803
- Home
- :
- Grades
- :
- STAINLESS STEEL
- :
- Duplex 2205/31803
Grades
Duplex 2205/31803
Duplex 2205 and 31803 are both grades of duplex stainless steel, which is a type of stainless steel that has a two-phase microstructure consisting of both austenitic (chromium-nickel) and ferritic (chromium-molybdenum) phases. This combination of phases provides a balance of strength and corrosion resistance, making duplex stainless steels suitable for a variety of applications, particularly in aggressive environments.
Duplex 2205:
- Composition: Duplex 2205 is composed of 22% chromium, 5-6% nickel, 3% molybdenum, and about 2% manganese. It also contains small amounts of nitrogen (0.14-0.20%) to promote the formation of the duplex microstructure.
- Properties:
- Corrosion Resistance: Duplex 2205 offers excellent corrosion resistance, particularly in chloride-containing environments. This makes it suitable for applications in industries such as chemical processing, oil and gas, and marine engineering.
- Strength: It has higher strength compared to austenitic stainless steels, allowing for thinner material to be used in structural components.
- Weldability: Duplex 2205 has good weldability, but attention must be paid to heat input and interpass temperatures to avoid the formation of undesirable phases.
Duplex 31803:
- Composition: Duplex 31803, also known as 2205 with higher nitrogen content, has a composition similar to Duplex 2205 but with increased nitrogen (0.24-0.32%). The higher nitrogen content enhances the strength and corrosion resistance of the material.
- Properties:
- Improved Corrosion Resistance: The higher nitrogen content in Duplex 31803 improves its resistance to pitting and crevice corrosion in harsh environments.
- High Strength: Similar to Duplex 2205, Duplex 31803 exhibits high strength, which is advantageous in applications where structural integrity is critical.
- Applications: It is commonly used in chemical processing, petrochemical, and oil and gas industries.
Both Duplex 2205 and 31803 are widely used in various applications where a combination of high strength and corrosion resistance is required. Common applications include pressure vessels, heat exchangers, pipelines, chemical processing equipment, and marine engineering. The choice between the two depends on specific project requirements and environmental conditions.
Products and Size Ranges
We supply hardness of wire (Soft, Quater Hard, Half Hard) according to customer requirements.
Material Certification and Traceability
At Satyam Overseas, we prioritize Material Certification and Traceability. Our materials, meeting ASTM and ASME standards, come with 3.1 Mill Test Certificates as a guarantee of compliance. Additionally, upon request, we provide 3.2 Mill Test Certificates for added assurance. Every material is clearly marked and accompanied by a corresponding certificate, meticulously linking markings to certification. This meticulous approach ensures complete accountability and unwavering reliability throughout our supply chain.
Chemical Composition
| Element | Duplex 2205 Composition (in %) | Duplex 31803 Composition (in %) |
|---|---|---|
| Chromium (Cr) | 22.0 | 21.0-23.0 |
| Nickel (Ni) | 4.5-6.5 | 4.5-6.5 |
| Molybdenum (Mo) | 3.0-3.5 | 2.5-3.5 |
| Manganese (Mn) | 2.0 max | 2.0 max |
| Nitrogen (N) | 0.14-0.20 | 0.24-0.32 |
| Silicon (Si) | 1.0 max | 1.0 max |
| Phosphorus (P) | 0.03 max | 0.03 max |
| Sulfur (S) | 0.02 max | 0.02 max |
physical properties
| Property | Duplex 2205 | Duplex 31803 |
|---|---|---|
| Density (g/cm³) | 7.805 | 7.805 |
| Melting Range (°C) | 1400-1450 | 1400-1450 |
| Specific Heat (J/kg·K) | 475 | 475 |
| Thermal Conductivity (W/m·K) | 19.7 | 19.7 |
| Electrical Resistivity (μΩ·cm) | 85 | 85 |
| Modulus of Elasticity (GPa) | 200 | 200 |
| Poisson’s Ratio | 0.3 | 0.3 |