Super Duplex 32760 / F55 | Intamet Ltd

Zeron 100 (A Trademark of Rolled Alloys Inc.) is a strong and durable stainless steel. It can withstand harsh conditions because of its high strength, corrosion resistance, and durability.

Super Duplex 32760, also called F55, is a strong stainless steel alloy with great resistance to rust and good mechanical properties. It is a duplex stainless steel, which means it has a two-phase microstructure consisting of both austenitic and ferritic phases. This unique microstructure gives the alloy excellent strength and corrosion resistance, making it suitable for use in harsh environments.

Super Duplex 32760 has lots of chromium, molybdenum, and tungsten, making it more resistant to pitting and crevice corrosion. Adding nitrogen improves the alloy's strength and hardness, making it strong and resistant to breaking or bending. The high chromium content also provides good resistance to oxidising acids such as nitric and sulfuric acid.

Super Duplex 32760 is highly resistant to stress corrosion cracking. This makes it suitable for use in various industries such as oil and gas, chemical processing, and seawater. It is also resistant to chloride-induced stress corrosion cracking, making it suitable for use in harsh marine environments. The high strength of the alloy also makes it suitable for use in pressure vessels and piping systems, where high-pressure environments are present.

In terms of fabrication and machining, Super Duplex 32760 is generally easier to work with compared to other super duplex alloys, due to its lower nickel content. However, care should be taken during welding, as the high molybdenum and tungsten content can make the alloy prone to hot cracking.

In conclusion, Super Duplex 32760 is a high-performance stainless steel alloy that offers excellent mechanical and corrosion resistance properties. It is perfect for use in tough conditions, especially in the oil and gas, chemical processing, and marine industries. This is because it has strong resistance to stress corrosion cracking and durability.

The physical and mechanical properties of Super Duplex 32760, also known as F55, are as follows:

Physical Properties:

  • Density: 7.8 g/cm3
  • Thermal conductivity: 14.2 W/mK
  • Electrical resistivity: 720 μΩ-cm
  • Modulus of elasticity: 193 GPa
  • Magnetic permeability: 1.02 (at room temperature)

Mechanical Properties:

  • Tensile strength: 880-1100 MPa
  • Yield strength: 550-750 MPa
  • Elongation: 20-30%
  • Hardness (Brinell): 270-310 HB
  • Impact toughness: 50 J at -60°C

Super Duplex 32760's mechanical properties can change due to factors like temperature, strain rate, and prior heat treatment exposure. As a result, it's important to carefully consider the conditions of use when selecting the right properties for a specific application. The properties listed above are typical values and should only be used as a rough guide. It's always best to consult a materials engineer or specialist for the specific application requirements.

Physical & Mechanical Properties of 32760 / F55

The Super Duplex 32760, also known as F55, is a marvel in the world of metallurgy. Its properties like density, conductivity, and resistivity make it ideal for applications needing strength and resistance to environmental factors. Mechanically, its tensile strength, yield strength, and elongation percentages are a testament to its robustness, allowing it to withstand significant stresses without deformation or failure.

Chemical Composition of 32760 / F55

The chemical composition of Super Duplex 32760, also known as F55, is as follows:

  • Chromium (Cr): 24-26%
  • Nickel (Ni): 6.5-8.0%
  • Molybdenum (Mo): 3.0-5.0%
  • Manganese (Mn): 1.0-2.0%
  • Silicon (Si): 0.7-1.3%
  • Phosphorus (P): 0.03% max
  • Sulfur (S): 0.02% max
  • Nitrogen (N): 0.14-0.20%
  • Carbon (C): 0.03% max
  • Copper (Cu): 0.5% max
  • Tungsten (W): 1.0-2.0%

Super Duplex 32760 has a special mix of elements that give it strong, corrosion-resistant properties and other important qualities. However, like any high-performance material, its properties can be sensitive to even slight variations in its chemical makeup.

Manufacturing processes, raw material sources, and even environmental factors during production can introduce subtle differences in the final composition of the alloy. A slight increase in carbon levels can lead to the formation of harmful chromium carbides at the boundaries between grains. These carbides can then weaken the alloy's ability to withstand corrosion. Similarly, variations in elements like molybdenum or tungsten can influence the alloy's resistance to pitting and crevice corrosion.

Given these sensitivities, the choice of manufacturer or supplier becomes paramount. A trusted supplier will have strict quality control to ensure each batch of Super Duplex 32760 meets the required composition.

Typically, they find good materials. They use advanced techniques. They test the alloy to ensure consistency and functionality.

Furthermore, the importance of correct manufacturing extends beyond just the chemical composition. Heat treatment is crucial for achieving the desired balance between austenitic and ferritic phases in the alloy. This balance directly impacts the mechanical properties of the alloy. Improper heat treatment can result in unwanted phases, such as sigma phase, which can degrade the alloy's toughness and corrosion resistance.

Super Duplex 32760 is an exceptional material, but its performance depends on its specific chemical composition and manufacturing methods. As such, industries and businesses that rely on this alloy must prioritise sourcing it from trusted, reliable suppliers. They use Super Duplex 32760 because it is strong, durable, and resistant to corrosion. They want to maximize these qualities in their applications.


Intamet offers 32760 in a wide range of forms, including the below:

Stacked Pipes

Tubes & Pipes


Fitting & Flanges


Round Bars


Sheet & Plate