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What is Duplex 2205/31803 Foil? Properties, Uses and Composition

What is Duplex 2205/31803 Foil? Properties, Uses and Composition

Duplex 2205/31803 Foil is an extremely versatile material used in various industries for different applications. It is a type of duplex stainless steel comprising a combination of austenitic and ferritic steel types. This unique composition gives it superior strength, heat resistance, corrosion resistance, and other desirable properties, making it a popular choice for high-performance applications.

This comprehensive guide will explore the properties, uses, and composition of Duplex 2205/31803 Foil. By the end of this article, you will better understand this remarkable material and its potential applications.

What is Duplex 2205/31803 Foil?

Duplex 2205/31803 Foil is a versatile material used in many industries for its superior corrosion resistance, high strength and ductility. It combines the properties of ferritic and austenitic stainless steel. It is composed of about 22% chromium, 3% molybdenum, 5-6% nickel and nitrogen to achieve a higher level of strength compared to other common grades such as 304L/316L. The result is an alloy with twice the yield strength and improved chloride pitting resistance compared to 316L/304L stainless steel alloys. Furthermore, high-temperature creep strength and improved low-temperature toughness make it ideal for marine environments or other corrosive applications. Although more expensive than traditional stainless steel products due to its production process, Duplex 2205/31803 Foil offers numerous advantages over other materials, such as increased corrosion resistance, good weldability, making it easy to fabricate complex shapes without heat treatment, better stress cracking resistance at room temperature and elevated temperatures (up to 500˚F), greater mechanical stability under load cycling conditions and even greater impact toughness at cryogenic temperatures (-320˚F).

A Comprehensive Guide to Duplex 2205/31803 Foil: Properties, Uses and Composition


Duplex 2205/31803 Foil is composed of 22% chromium, 5-6% nickel, 3% molybdenum, and 0.3% nitrogen. This unique combination of elements gives it superior strength, corrosion resistance, and thermal conductivity.

Corrosion Resistance:

Duplex 2205/31803 Foil is highly corrosion-resistant and ideal for harsh environments. It provides excellent resistance to stress corrosion cracking, pitting, and crevice corrosion. Its high resistance to corrosion in chloride environments makes it an excellent choice for marine applications.

Strength and Durability:

Duplex 2205/31803 Foil is known for its high strength and durability. It has a higher yield strength than most austenitic stainless steel types and is more fatigue-resistant than most ferritic stainless steel types. Duplex 2205/31803 Foil is ideal for use in high-stress applications such as pressure vessels, heat exchangers, and offshore platforms.

Heat Resistance:

Duplex 2205/31803 Foil is also known for its excellent heat resistance. It can withstand high temperatures without losing its strength or becoming brittle. This makes it an ideal material for use in high-temperature applications such as furnaces, power generation, and chemical processing plants.


Duplex 2205/31803 Foil is used in various applications across several industries due to its desirable properties. It is commonly used in the oil and gas industry for piping, valves, and fittings. It is also used in chemical processing plants for heat exchangers, tanks, and reactors. Other common applications include desalination plants, food and beverage processing, and construction.

In the construction industry, Duplex 2205/31803 Foil is used for structural components, roofing, and cladding. It also manufactures pressure vessels, flanges, and fittings for the chemical and petrochemical industries.


In conclusion, Duplex 2205/31803 Foil is an incredibly versatile material widely used in various industries for different applications. Its unique composition gives it an excellent combination of strength, heat resistance, and corrosion resistance. Due to its desirable properties, it is an ideal material for use in high-performance applications, particularly in harsh environments.

Whether working in the oil and gas industry, chemical processing, or construction, Duplex 2205/31803 Foil covers you. Its superior performance and wide range of applications make it a preferred material choice for many industrial applications.

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