Stainless Steel

Duplex Stainless Steel 31803/F51


Duplex stainless steel 22% chromium duplex (austenitic / ferritic) steel with moderate to good strength and good general corrosion/stress corrosion/cracking resistance.This alloy resists chloride environments and sulphide stress corrosion and is roughly double the strength of standard austenitic stainless steels. Alloy 31803/F51 can be used successfully as an alternative to 300 serious austenitic stainless steel in most applications where higher mechanical strength/lower weight is required.Alloy 31803/F51 is readily weldable using many of the standard electric arc welding processes but oxyacetylene welding is not recommended because carbon pickup in the weld metals may occur.

Typical applications: Pumps, valves, flanges, boat shafts, various applications in the oil & gas, chemical, power and brewing industries.

Available in dia bar stock from 1/2" to 16"

(other forms available on request)

Colour Code

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Related Specifications

Steel Number UNS EN
1.4462 S31803 10088-3

Typical Chemical Analysis

C Si Mn P S N Cr Ni Mo
.03 1.0 2.0 .03 .02 .08-.2 21-23 4-6.5 2-3.5

For further technical information or additional sizes on this product or any other product or service please contact us.


All data provided is for information and guidance only. Information above is not for design purposes and comes without warranty or guarantee with respect to the subject matter or fitness for purpose.