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List of Alloys & profiles

List of Alloys & profiles

Alloy Wire International

Datasheet: Duplex

Duplex

Duplex stainless steels are magnetic and are far more corrosion resistant than more commonly used stainless grades, i.e. 302 and 316. Duplex is characterised by its high yield strength, as well as good fatigue strength and excellent corrosion resistance.

Duplex is also known as Duplex 2205 and Cronifer 2205 LCN.

Available in all profile options

Duplex - Alloy Wire International 1

Key Features

Duplex offers the following key features:

Greater corrosion resistance than stainless steel 300 series.
Greater pitting resistance and uniform corrosion resistance to stress corrosion cracking than stainless steel 300 series.
Good weldability.

Typical Applications

Duplex is known to be suitable for the following applications:

Chemical processing
Oil and gas refining
Marine environments
Pollution control equipment


Designations

W.Nr 1.4462
UNS S31803
2205
AWS 167

Specifications

ISO 15156-3
(NACE MR 0175)

Chemical Composition

The chemical composition of Duplex is indicated in the table below:

ElementMin %Max %
C0.03
Si1.00
Mn2.00
P0.035
S0.015
Cr21.0023.00
Ni4.506.50
Mo2.503.50
N0.100.22

Alloy Details

Duplex density, melting point, coefficient of expansion, modulus of rigidity, and elasticity is indicated in the table below:

DensityMelting PointCoefficient of ExpansionModulus of RigidityModulus of Elasticity
7.8 g/cm³1470 °C13.7 μm/m °C (21 – 100 °C)76.9 kN/mm²200 kN/mm²
0.282 lb/in³2680 °F7.610 x 10-6 in/in °F (70 – 212 °F)11154 ksi29008 ksi

Heat treatment of finished parts

The typical heat treatment of Duplex:

Condition as supplied by AWITypeTemperatureTimeCooling
Annealed or Spring TemperStress Relieve250 °C (480 °F)1 HrAir

Properties

The typical mechanical properties of Duplex:

Solution Annealed
Approx. tensile strength<1100 N/mm²<159 ksi
Approx. operating temperature-200 to +300 °C-330 to +570 °F
Spring Temper
Approx. tensile strength1300 – 1900 N/mm²189 – 276 ksi
Approx. operating temperature-200 to +300 °C-330 to +570 °F

The above tensile strength ranges are typical. If you require different please ask.