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Duplex 2205 steel / AISI 318

The austenitic-ferritic chromium-nickel-molybdenum steel, F51 material / Duplex 2205, is rust and acid resistant. It is characterized by its good corrosion resistance to pitting and surface corrosion. Resistance to seawater is given.

Duplex 2205 magnetic stainless steel has high yield strength, molybdenum addition and low nickel content.
Its particular strength is resistance to stress corrosion.

Duplex 2205 stainless steel is used in construction industry, shipbuilding, food industry, chemical industry, mechanical engineering, seawater desalination plants, offshore and for oil and gas industry. SS steel high pressure pumps.

F51 AISI 318 Special Steel

International identifiers

ASTM A182F51, SUS329J3L, STS329J3LTP, S31803, SS2377, Z3CND22-05Az, 1.4462, Duplex 2205, Alloy 2205

Chemical composition

F51 / AISI 318
C Si Mn P S Cr Mo Ni N
min. 21.0 2.5 4.5 0.10
max. 0.03 1.0 2.0 0.035 0.02 23.0 3.5 6.5 0.22


F51 duplex / AISI 318 must be heated slowly to 1200°C, as it reacts sensitively to thermal shock stresses. With subsequent rapid cooling in air or water, it can be forged in the temperature range between 1200°C – 900°C.


Weldability of Alloy 2205 is difficult. Working with unsuitable welding parameters can lead to poor results.

Corrosion resistance

Duplex 2205 has excellent corrosion resistance in acid environments, pitting corrosion and chloride-containing media. Against intergranular corrosion and stress corrosion cracking, this stainless steel is strongly superior to austenitic steel grades due to the duplex structure of austenite and ferrite.


F51 / AISI 318 is machinable only under difficult properties due to the two-phase structure. The machinability allows ideal cutting conditions and are in the smaller range than of austenites. Therefore, it is advisable to use cermet or coated carbide tips.

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