Technical Metal Corporation manufacture and supply a comprehensive range of Duplex Steel Sheet Plate. Our Gujarat Division provide total Piping Solutions for various projects in India & overseas so far we have supplied Duplex Steel Sheet Plate to more than 30 countries like UK, Ireland, Vietnam, Philippines, South Africa, Australia, Kenya, Nigeria, Iran, Russia, Japan, Canada and many more European & African Countries , We have wide range of manufacturing capabilities and due to our proven track record & only 1% rejection rate became Technical Metal Corporation an ideal choice for major EPC Contractors across the globe for their Duplex Steel requirements.
Stainless Steel - Duplex - ASTM A815 ~ S31803
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. Duplex stainless steels are in most cases, tougher than ferritic stainless steels. Strengths of duplex stainless steels can in some cases be double that for austenitic stainless steels. Whilst duplex stainless steels are considered resistant to stress corrosion cracking, they are not as resistant to this form of attack as ferritic stainless steels. However, the corrosion resistance of the least resistant duplex stainless steels is greater than that for the most commonly used grades of stainless steels, i.e. 304 and 316. Duplex steels are also magnetic, a property that can be used to easily differentiate them from common austenitic grades of stainless. Property data given in this document is typical for flat rolled products covered by ASTM A240/A240M. ASTM, EN or other standards may cover products sold. It is reasonable to expect specifications in these standards to be similar but not necessarily identical to those given in this datasheet.
Flanges, Fittings & Valves
0.0 - 0.03
21.00 - 23.00
0.0 - 0.03
0.0 - 0.02
4.50 - 6.50
0.08 - 0.20
2.50 - 3.50
13.7 x10^-6 /K
Modulus of Elasticity
0.085 x10^-6 Ω .m
450 Min MPa
620 Min MPa
Elongation A50 mm
25 Min %
290 Max HB
Grade UNS 31803 is similar to:
Fittings & Flanges
Duplex stainless steels are typically used in:
~ Chemical processing, transport and storage
~ Oil and gas exploration and offshore rigs
~ Oil and gas refining
~ Marine environments
~ Pollution control equipment
~ Pulp & paper manufacturing
~ Chemical process plant
Duplex stainless steels are extremely corrosion resistant. They have high resistance to intergranular corrosion. Even in chloride and sulphide environments, duplex stainless steels exhibit very high resistance to stress corrosion cracking.
The super duplex grades are even more resistant to corrosion.
The high chromium content of duplex stainless steels that protects against corrosion, causes embrittlement at temperatures over about 300°C.
At low temperatures duplex stainless steels have better ductility than the ferritic and martensitic grades. Duplex grades can readily be used down to at least -50°C.
Fabrication of all stainless steels should be done only with tools dedicated to stainless steel materials. Tooling and work surfaces must be thoroughly cleaned before use. These precautions are necessary to avoid cross contamination of stainless steel by easily corroded metals that may discolour the surface of the fabricated product.
Although machinable, the high strengths of duplex stainless steels makes machining difficult. As an example, machining of 2205 is around 20% slower than for 304.
Machining can be enhanced by using the following rules:
~ Cutting edges must be kept sharp. Dull edges cause excess work hardening.
~ Cuts should be light but deep enough to prevent work hardening by riding on the surface of the material.
~ Chip breakers should be employed to assist in ensuring swarf remains clear of the work
~ Low thermal conductivity of austenitic alloys results in heat concentrating at the cutting edges. This means coolants and lubricants are necessary and must be used in large quantities.
Duplex stainless steels cannot be hardened by heat treatment. They can however be work hardened.
Solution treatment or annealing can be done by rapid cooling after heating to around 1100°C.
Duplex stainless steels have good weldability. All standard welding processes can be used. They are not quite as easily welded as the austenitic grades but low thermal expansion in duplex grades reduces distortion and residual stresses after welding. The recommended filler material for 2205 stainless steel is 2209.
*S31803 has been supplemented by S32205 which has a higher minimum N, CR and Mo A995 optionally supersedes A990 (1A and 1C are not referenced in A995)
Super Duplex 32750
†S31803 has been supplemented by S32205 which has a higher minimum N, CR and Mo. *Not referenced in ASME B16.34-2009
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Grades, Stainless Steel, Duplex Grade, ASTM A815, S31803, 2205, EN 1.4462Z, UNS S31803, UNS S32205, BS 318S13, Sheet, Plate, Round Bar, Pipes, Tubes, Duplex Grade ASTM A815 Corrosion Resistance, Duplex Grade ASTM A815
Duplex Grade ASTM A815 Mechanical Property, Duplex Grade ASTM A815 , S31803, 2205, EN 1.4462Z, UNS S31803, UNS S32205, BS 318S13 Physical Property, Duplex Grade ASTM A815 Chemical Composition