UNS S31803 Plate

Alternative and trade names
UNS S31803, ALLOY 1.4462, DUPLEX UNS S31803, UNS S32205
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Description

Duplex UNS S31803 is the most common duplex grade in the market with high mechanical strength. It is widely used in Oil & Gas Industry, hydro power, pressure vessels, pulp & Equipment for the Paper Industry, Paper Industry, structural components and chemical tankers. The alloy is not intended to be used at temperatures above 300°C due to embrittlement.

Related Standards

Equivalent Materials

This material data has been provided by Sverdrup Steel.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

Dimension

PropertyValue

Length

2000 - 6000 mm

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Thickness

1 - 50 mm

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Width

1000 - 2000 mm

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Mechanical

PropertyTemperatureValue

Charpy impact energy, V-notch

-46.0 °C

45 J

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Elongation

23.0 °C

25 %

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Hardness, Brinell

23.0 °C

270 [-]

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Tensile strength

23.0 °C

650 - 880 MPa

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Yield strength Rp0.2

23.0 °C

450 MPa

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Chemical properties

PropertyValue

Carbon

0.03 %

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Chromium

21 - 23 %

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Iron

Balance

Manganese

2 %

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Molybdenum

2.5 - 3.5 %

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Nickel

4.5 - 6.5 %

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Nitrogen

0.1 - 0.22 %

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Phosphorus

0.03 %

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Silicon

1 %

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Sulfur

0.015 %

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Technological properties

Property
Application areas

It is widely used in Oil & Gas Industry, hydro power, pressure vessels, pulp & Equipment for the Paper Industry, structural components and chemical tankers.

Corrosion properties

High resistance to stress corrosion cracking in halide containing environments, High resistance to pitting and crevice corrosion, High resistance to general corrosion, High resistance to erosion corrosion and corrosion fatigue. PREN ≥ 34

Heat Treatment

Solution annealing at 1020 – 1100°C followed by water quenching.

Welding

Very good