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S31803 Duplex
S31803 Duplex – a balanced duplex stainless steel combining high strength with excellent resistance to pitting, crevice, and stress corrosion, ideal for harsh and marine environments.
S31803 Duplex
Supreme Steel are suppliers of UNS S31803, a chromium nickel molybdenum austenitic ferritic grade. It combines improved resistance to stress corrosion cracking, pitting, crevice corrosion and high strength in comparison with other stainless steel grades. UNS S31803 grade duplex resists chloride environments and sulphide stress corrosion. It is approximately double the yield strength of standard austenitic stainless steel grades. As with other duplex stainless steel specifications oxidation resistance is good at high temperature, though it is prone to embrittlement when exposed to temperatures above 300°C and is prone to embrittlement at 475°C when exposed for 2 hours only. It is also subject to embrittlement between 370-540°C when exposed over a longer period.
We welcome export enquiries for stainless steel. Contact our sales office for further details.
Chemical Composition | Percentage % |
|---|---|
Carbon | 0.03 % max |
Manganese | 2.00% max |
Silicon | 1.00% max |
Nickel | 4.50-6.50% |
Chromium | 21.00-23.00% |
Sulphur | 0.015% max |
Molybdenum | 2.50-3.50% |
Nitrogen | 0.10-0.22% |
Quality Assured Supply
S31803 grade is available with BS EN 10204 3.1 mill certificate or cast and analysis certification. Please request any material certificate requirements when placing your order.
Form of Supply
Diameters can be sawn to your required lengths as one offs or multiple cut pieces. UNS S31803 plate and sheet are available to European steel grades, which can be supplied as full plates and sheets or can be cut to your requirements. Diameters availability are up to 12⌀ – 503⌀. Sheets availability are up to 1.2mm – 50mm. Contact our experienced sales team who will assist you with your S31803 stainless steel enquiry.
Applications
UNS S31803 duplex can be used successfully as an alternative to standard stainless steel specifications in applications where higher strength and resistance to stress corrosion cracking is required. Widely used in the brewing, power generation, marine, petrochemical and chemical engineering industries. Typical applications include bushes, flanges, shafts and fasteners
