Super Duplex 32750 (1.4410/F53)

Q: What are the Mechanical Properties of Super Duplex 32750?

Typical values: tensile strength 770-930 MPa; yield strength (0.2 percent proof) >= 550 MPa; elongation >= 25 percent; hardness 100 J at room temperature; modulus of elasticity 200 GPa. High yield strength supports thinner wall designs for offshore platforms, pressure piping and energy systems.

Q: What are the Physical Properties of Super Duplex 32750?

Typical values: density 7.8 g/cm3; melting range 1350-1400 C; thermal conductivity at 20 C approx 14.5 W/m K; thermal expansion approx 13.5 x 10^-6 per K; modulus of elasticity 200 GPa; electrical resistivity approx 0.8 micro-ohm m at 20 C. These support stable performance under temperature and pressure cycling in marine and process environments.

Q: Are there Variants of Super Duplex 32750?

Related grades include S32760 (1.4501) with tungsten for enhanced pitting resistance in severe seawater; Lean Duplex grades such as 2304 for cost sensitive service in moderate environments; and Hyper Duplex grades designed for ultra corrosive, high pressure settings. Selection depends on corrosion exposure, strength needs and fabrication constraints.

Q: What is the Chemical Composition of Super Duplex 32750?

Typical composition in percent: Chromium 24-26; Nickel 6-8; Molybdenum 3-5; Nitrogen 0.24-0.32; Manganese 1.2 max; Silicon 0.8 max; Carbon 0.03 max; Phosphorus 0.035 max; Sulfur 0.02 max; Iron balance. This chemistry supports resistance to chlorides and acids with high mechanical reliability.

Q: Where is Super Duplex 32750 Used?

Common applications: oil and gas (offshore platforms, subsea manifolds, risers); marine (saltwater cooling systems, propeller shafts, pumps); desalination plants (brine heaters, evaporator tubing); chemical processing (reactor vessels, storage tanks, pressure piping); power generation (flue gas scrubbers, heat recovery); pulp and paper (bleach plants, digesters, recovery units). Supplied in pipe, tube, plate, bar and formed components.

Engineered for extreme durability in high-pressure, corrosive, and structural applications where material reliability is critical.

Super Duplex 32750

Super Duplex 32750 stainless steel (1.4410 / F53 / UNS S32750) is a premium-grade alloy engineered for exceptional performance in the most demanding environments. Featuring a dual-phase austenitic–ferritic microstructure, it offers a rare combination of mechanical strength, corrosion resistance, and fatigue durability that outperforms standard stainless steels and many lower duplex grades.

With elevated levels of chromium (24–26%), molybdenum (3–5%), and nitrogen (0.24–0.32%), Super Duplex 32750 excels in resisting pitting, crevice corrosion, and stress corrosion cracking, even in highly aggressive conditions such as seawater exposure, chemical processing, and offshore drilling systems.

Thanks to its outstanding strength-to-weight ratio and excellent weldability, this alloy is widely used in heat exchangers, pressure vessels, subsea components, and structural applications where material failure is not an option.

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AVAILABLE FORMS

Intamet offers Super Duplex 32750 in a wide range of forms, including the below:

Super Duplex 32750 offers exceptional mechanical strength while retaining good ductility and impact resistance. These attributes make it an ideal material for weight-sensitive, high-pressure, and load-bearing applications.

Typical Mechanical Properties:

Tensile Strength: 770–930 MPa - Provides robust load-bearing capacity, allowing the alloy to perform under extreme mechanical stress.

Yield Strength (0.2% proof): ≥550 MPa - Ensures the material can withstand high pressure without permanent deformation, even in thinner wall designs.

Elongation at Break: ≥25% - Offers excellent ductility and formability for fabrication and installation in complex geometries.

Hardness: ≤28 HRC - Balances wear resistance with machinability, supporting durability without compromising workability.

Impact Toughness (Charpy V-notch): >100 J at room temperature - Delivers reliable impact resistance, reducing the risk of brittle failure under dynamic or low-temperature loads.

Modulus of Elasticity: 200 GPa - Provides structural stiffness essential for maintaining shape under stress in demanding environments.

Its high yield strength allows for thinner-walled components without sacrificing structural integrity, ideal for offshore platforms, pressure piping, and energy systems.

What are the Physical Properties of Super Duplex 32750?

The physical properties of 32750 make it exceptionally stable under temperature fluctuations, pressure cycling, and corrosive exposure, common in marine and process environments.

Typical Physical Properties:

Density: 7.8 g/cm³ - Contributes to a strong yet relatively lightweight structure for transport and installation efficiency.

Melting Range: 1350–1400 °C - Offers thermal stability in high-temperature applications like heat exchangers and pressure vessels.

Thermal Conductivity: 14.5 W/m·K (at 20 °C) - Supports effective heat transfer, making the alloy suitable for thermal management in energy and process systems.

Thermal Expansion: 13.5 × 10⁻⁶/K - Maintains dimensional stability during temperature changes, reducing the risk of distortion or fatigue.

Modulus of Elasticity: 200 GPa - Ensures mechanical rigidity under high loads, ideal for structural and rotating equipment.

Electrical Resistivity: 0.8 μΩ·m (at 20 °C) - Helps protect against localised heating or arcing in electrical or electrochemical environments.

These thermal characteristics support consistent performance in desalination plants, chemical heat exchangers, and thermal recovery systems where dimensional stability is key.

Are there Variants of Super Duplex 32750?

While 32750 is a leading super duplex alloy, other variants are available for specialised needs across different industries.

Related Grades:

S32760 (1.4501): Similar to 32750 but includes tungsten for enhanced pitting resistance; used in extreme seawater or brine environments.

Lean Duplex (e.g., 2304): Offers duplex strength with reduced nickel and molybdenum; ideal for less aggressive environments.

Hyper Duplex (e.g., 2507): Designed for ultra-corrosive and high-pressure settings; offers even greater resistance and mechanical strength.

Engineers often choose between these based on cost, fabrication needs, and specific environmental exposure.

What is the Chemical Composition of Super Duplex 32750?

The alloy’s corrosion resistance and mechanical reliability stem from a tightly controlled chemical composition tailored for long-term exposure to chlorides, acids, and high temperatures.

Typical Composition (%):

Chromium (Cr): 24–26
Improves oxidation and pitting resistance

Nickel (Ni): 6–8
Stabilises the austenitic structure and improves ductility

Molybdenum (Mo): 3–5
Boosts resistance to crevice and pitting corrosion

Nitrogen (N): 0.24–0.32
Increases strength and corrosion resistance

Manganese (Mn): ≤1.2
Supports mechanical toughness

Silicon (Si): ≤0.8
Enhances oxidation resistance

Carbon (C): ≤0.03
Limits carbide precipitation during welding

Phosphorus (P): ≤0.035

Sulfur (S): ≤0.02

Iron (Fe): Balance

This chemical profile makes 32750 highly effective in chloride-rich and acidic service conditions, such as seawater desalination or acid leach processing.

Where is Super Duplex 32750 Used?

Super Duplex 32750 is trusted in critical applications where failure could have severe financial or safety consequences. Its combination of high strength and corrosion resistance reduces maintenance costs, extends service life, and enhances performance in:

Oil & Gas: Offshore platforms, subsea manifolds, risers

Marine: Saltwater cooling systems, propeller shafts, pumps

Desalination Plants: Brine heaters, evaporator tubing

Chemical Processing: Reactor vessels, storage tanks, pressure piping

Power Generation: Flue gas scrubbers, heat recovery systems

Pulp & Paper: Bleach plants, digesters, chemical recovery units

Available in pipe, tube, plate, bar, and custom-formed components, 32750 is a go-to material for heavy-duty industrial environments.

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Super Duplex 32750 (1.4410/F53)