Super Zeron 100 (F55)

  • Outstanding resistance to corrosion
  • Equal austenitic and ferritic combo
  • Improved resistance to fatigue compared to austenitic stainless steels
  • Brilliant machinability
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Zeron 100 (F55 Duplex / 25Cr Duplex) is a super duplex stainless steel that has a 50-50 austenitic-ferritic structure.

It offers high corrosion resistance against strong acids like sulfuric acid and can withstand saline environments efficiently.

Compared to the traditional austenitic stainless steel, it is much stronger and can be machined easily.

Zeron finds its usage in multiple industries like oil and mining, desalinization, chemical factories, and many more, owing to its resistance to strong corrosive agents.

It is also noted for its impact strength.

Common Trade Names:

  • UNS S32760
  • F55 Duplex
  • W.Nr./EN 1.4501
  • 25Cr Duplex
  • Super Duplex  Stainless
  • X2CrNiMoCuWN25.7.4
  • AFNOR Z3CND25.06Az
  • EN10088-3

Chemical Properties:

  • Chromium (%): 24-26
  • Nickel (%): 6-8
  • Molybdenum (%): 3-4
  •  Manganese (%): Max 1
  • Silicon (%): Max 1
  • Others (%): Remainder

Mechanical Properties:

  • 0.2% Yield Strength (MPa): 550
  • Tensile Strength (MPa): 750
  • Break Elongation: 25 %
  • Elastic Modulus (GPa): 200
  • Hardness (Rockwell C): 28

Physical Properties:

  • Density (g/cm3): 7.84
  • Specific Heat Capacity (J/kg-°C): 482
  • Electrical Resistivity (µohm-m): 0.851
  • Poisson’s ratio (No unit): 0.32

Key Features:

  • Resistant to corrosion: This super duplex stainless steel efficiently manages to resist corrosive agents. It has an appreciable performance when it comes to corrosion and corrosion fatigue handling. Zeron 100 is famous for its great performance in beating chloride-induced stress corrosion cracking and sulfide-stress cracking in sour-gas conditions.
  • Strong and durable: The strength offered by this alloy is highly improved compared to its austenitic ancestors. It can give you strong and durable machinery for multiple needs.
  • Easy and effective machinability: Working with super duplex UNS S32760 is quite easy and requires less effort from the side of the workers. The high machinability index of this alloy grade makes it a favorite of many manufacturing industries.

Available Forms of super duplex stainless steel Zeron 100 at Yubisteel:

  • Round bars (ASTM A276, ASTM A479, ASME SA479)
  • Plates/Sheets (ASTM A240, ASME SA240)
  • Strips, Flanges, Pipes, Fittings, Weld wire, Welding Products
  • Other Standard (ASTM A182 (Grade F55), ASTM A276, ASTM A314, ASTM A473, ASTM A479, ASTM A789, ASTM A790, ASTM A815, ASTM A890, ASTM A928, ASTM A988, ASTM A995)


  • Oil and gas industries
  • Paper and pulp industries
  • Chemical factories
  • Desalinization
  • Power generation industries
  • Mining
  • Pressure vessels
  • Flue gas desulfurization equipment

Possible Alternative Grades:

  • Alloy 20: It is a highly corrosion-resistant material that can be a good substitute for super duplex. It is an austenitic alloy of Nickel, consisting of added concentrations of Molybdenum and Copper. It is a strong compound with good durability.
  • Duplex stainless steel 2205: When it comes to corrosion resistance, this stainless steel alloy can be a good competitor of Zeron 100. It effectively handles acidic and gaseous corrosions and is a tough alloy with great formability. Generally preferred below 600°C, this compound finds its usage in many industries as an alternative to super duplex UNS S32760.

Frequently Asked Questions:

1. What is the PREn value for Zeron 100?

Zeron 100 meets the PREn value of 40.

2. What material can be used to readily weld Zeron 100?

This alloy can be readily welded using ZERON 100 filler metal.

3. Will the impact of energy be affected under any circumstance?

It is to be noted that the impact energy of the alloy decreases gradually with temperature fall.

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