DUPLEX STEEL
Material Range
DUPLEX STEEL
Duplex grades have a ferritic-austenitic microstructure that combines many of the beneficial properties of ferritic and austenitic stainless steels. The duplex microstructure also contributes to high strength and high resistance to stress corrosion cracking.
Duplex stainless steels are characterized by high chromium content (20.1–25.4%) and low nickel content (1.4–7%) compared to austenitic grades. The low nickel content makes duplex grades more price stable. Molybdenum (0.3–4%) and nitrogen are added to improve corrosion resistance, while nitrogen also increases strength. Due to their ferrite content the duplex grades are magnetic.
Duplex Steel were developed to exploit the desirable properties of both austenitic and stainless steels, namely high strength; excellent corrosion resistance; resistance to stress corrosion cracking and value for money compared with more expensive super austenitic stainless steels and nickel-based alloys. Although nominally a 50:50 mix, in practice, the ferrite content can vary between 35-55% and still achieve acceptable properties. The microstructure appears as grains or islands, of austenite within a matrix of ferrite.
Characteristics
1. Dual-Phase Microstructure:
Duplex Steel derives its name from its dual-phase microstructure, consisting of both austenitic (chromium-nickel) and ferritic (chromium-molybdenum) phases. This unique combination results in a material that exhibits outstanding strength and corrosion resistance.2. Superior Corrosion Resistance:
One of the standout features of Duplex Steel is its exceptional corrosion resistance, particularly in aggressive environments such as those containing chlorides. This makes it an ideal choice for applications in marine, chemical processing, and oil and gas industries.3. High Strength and Toughness:
Duplex Steel offers a high level of strength and toughness, providing structural integrity in demanding conditions. This makes it well-suited for applications where heavy loads, pressure, and challenging operating conditions are prevalent.4. Weldability:
Despite its high strength, Duplex Steel is known for its good weldability. This enables the fabrication of complex structures and components, offering flexibility in design and ease of manufacturing.5. Resistance to Stress Corrosion Cracking:
Duplex Steel’s resistance to stress corrosion cracking sets it apart in critical applications. This property ensures reliable performance in situations where the material is subjected to both corrosion and mechanical stress.applications
Duplex Stainless Steel serves many different applications in these industry categories:
- Chemical Process
- Petrochemical
- Oil & Gas
- Pharmaceutical
- Geothermal
- Sea Water
- Water Desalination
- LNG (Liquefied Natural Gas)
- Biomass
- Mining
- Utilities
- Nuclear Power
- Solar Power
Grades
DUPLEX 2205
Duplex 2205 is a two-phase, ferritic, austenitic 22% chromium, 3% molybdenum, 5 to 6% nickel alloyed stainless steel. It is the most widely used duplex stainless steel grade and is characterized by high yield strength, double that of the standard austenitic stainless steel grades, Excellent in most caustic environments.
DUPLEX 2304
DUPLEX 2202
Duplex 2202, or DX2202, is an austenitic-ferritic stainless steel. It offers users general resistance to corrosion that is comparable to Type 304L. Some of the other key characteristics of Duplex 2202 include. Improved mechanical strength,
● Service temperature range of -50 °C to 300°C, Stress corrosion resistance that is often double other austenitic stainless steels
DUPLEX 2507
Duplex 2507, is a commonly used super duplex stainless steel. Also sold as Alloy 2507, this alloy is used in situations where exceptional strength and corrosion resistance are in demand. Some of the applications and industries that utilize Duplex 2507 include Chemical process industries.
● Heat exchangers, vessels, and piping, Desalination plants and other saltwater applications.
● Power industry FGD systems & Offshore platforms including fire-fighting systems.
DUPLEX S32950
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Explore the possibilities with Duplex Steel 400 series with Bhavik Steel & Alloys. For inquiries, quotes, or custom solutions, feel free to contact us. Our team of experts is ready to assist you in finding the perfect stainless steel solution for your needs.