Duplex Stainless Steel
Key Features :
- Corrosion Resistance
Offers superior resistance to stress corrosion cracking and pitting, particularly in chloride environments.
- High Strength
Approximately twice the strength of conventional austenitic stainless steels.
- Good Weldability
Suitable for complex structures without sacrificing corrosion resistance.
- Longer Lifespan
Durable in harsh environments, reducing maintenance needs.
- High Toughness
Retains mechanical properties even at low temperatures.
Physical Properties of Duplex Stainless Steel :
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Thermal Conductivity | 19 W/m.K (at 20°C) |
| Coefficient of Expansion | 13.0 µm/m.°C (20-100°C) |
| Specific Heat Capacity | 500 J/kg.K |
| Electrical Resistivity | 0.85 μΩ.m (at 20°C) |
| Magnetic Permeability | 1.02 (H=200 Oersted) |
Mechanical Properties of Duplex Stainless Steel :
| Property | Value |
|---|---|
| Tensile Strength | 600-800 MPa |
| Yield Strength | 450-600 MPa |
| Elongation at Break | 25% |
| Hardness (Brinell) | 230 HBW |
| Impact Strength | ≥ 100 J (at room temperature) |
| Modulus of Elasticity | 200 GPa |
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FAQs
What is Duplex Stainless Steel?
Duplex stainless steel is a type of stainless steel that combines the properties of austenitic and ferritic stainless steels. It offers high strength, excellent corrosion resistance, and good weldability, making it ideal for applications in harsh environments.
What are the main applications of Duplex Stainless Steel?
Duplex stainless steel is commonly used in industries like oil and gas, chemical processing, marine environments, and pulp and paper manufacturing. Its high corrosion resistance and strength make it suitable for pressure vessels, pipes, and structural components.
How does Duplex Stainless Steel compare to other stainless steels?
Duplex stainless steel provides better corrosion resistance and higher strength than most austenitic stainless steels like 304 and 316. It also has improved resistance to stress corrosion cracking compared to ferritic stainless steels.
Can Duplex Stainless Steel be welded?
Yes, Duplex stainless steel can be welded using most standard welding processes, but it requires careful control of heat input and post-weld treatments to avoid issues like weld decay and to maintain its mechanical properties.
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