Stainless Steel - Duplex - ASTM A815 ~ S31803

Stainless Steel - Duplex - ASTM A815 ~ S31803

Stainless Steel - Duplex - ASTM A815 ~ S31803 Duplex stainless steels are extremely corrosion resistant, work hardenable alloys. Their microstructures consist of a mixture of austenite and ferrite phases. As a result, duplex stainless steels display properties characteristic of both austenitic...
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Stainless Steel - Duplex - ASTM A815 ~ S31803

Duplex stainless steels are extremely corrosion resistant, work hardenable alloys. Their microstructures consist of a mixture of austenite and ferrite phases. As a result, duplex stainless steels display properties characteristic of both austenitic and ferritic stainless steels. This combination of properties can mean some compromise when compared with pure austenitic and pure ferritic grades.

Chemical Composition

ElementContent (%)

Iron, Fe

63.75-71.92

Chromium, Cr

21.0-23.0

Nickel, Ni

4.50-6.50

Molybdenum, Mo

2.50-3.50

Manganese, Mn

2.0

Silicon, Si

1.0

Nitrogen, N

0.080-0.20

Carbon, C

0.030

Phosphorous, P

0.030

Sulfur, S

0.020


Physical Properties

PropertiesMetricImperial

Density

7.82 g/cm³

0.283 lb/in³


Mechanical Properties

PropertiesMetricImperial

Tensile strength at break

621 MPa

90000 psi

Yield strength (@strain 0.200 %)

448 MPa

65000 psi

Elongation at break (in 50 mm)

25.0 %

25.0 %

Hardness, Brinell

293

293

Hardness, Rockwell c

31.0

31.0


Thermal Properties

PropertiesMetricImperial

Thermal expansion co-efficient (@20-100°C/68-212°F)

13.7 µm/m°C

7.60 µin/in°F


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