Duplex,UNS S31803, 1.4462

Duplex UNS S31803 is an austenitic ferritic stainless steel which combines elements of chromium, nickel and molybdenum. It has roughly twice the yield strength of standard austenitic stainless steel grades. This grade of stainless steel offers excellent resistance to stress and crevice corrosion, pitting and cracking.

West Special Fasteners are manufacturers of Duplex UNS S31803 Fasteners.

Duplex UNS S31803 Fasteners such as Socket Capscrews, Washers, Studs, Studbolts, Bolts, Nuts, Socket Setscrews, Socket Countersunk screws & bespoke machined components to drawings or Hot Forged items can all be produced at West Special Fasteners Limited.

We can also supply round bar in Duplex UNS S31803.

Duplex UNS S31803’s characteristics mean that this duplex stainless steel can be used effectively as a substitute to 300 series stainless steels in conditions where greater mechanical strength and lesser weight is necessary and/or stress corrosion cracking resistance is crucial. Such as fasteners for chemical processing, marine environments, offshore oil & gas industry, pulp & paper processing and pollution control equipment.

West Special Fasteners specialise in exotic metals and have supplied major UK, European, International companies with Duplex UNS S31803 bolts, nuts, and components etc.



We look forward to helping with your Duplex UNS S31803 requirements and would welcome any enquiries by telephone on + 44 (0)1246 291111 or email sales@westspecialfasteners.co.uk.


Typical Chemical Analysis

C Si Mn P S Cr Ni Mo
0.030 1.000 2.000 0.030 0.020 21.0-23.0 4.5-6.5 2.5-3.5
W N2 Nb Ti Co Cu Al B
0.08-2.00
V Fe Mg Ta Nb + Ta Ca O2 Bi
Se Sn Zn Pb

Typical Mechanical Properties

Tensile Strength: 620N/mm² Min Impacts:
0.2% Proof Stress: 448N/mm² Min
Elongation: 25% Min Stress Rupture:
Reduction of Area:
Hardness: 290 BH Max
Other Remarks: