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Home > Our Products > Stainless Steel Plates > Grade / Standard > Duplex & Super Duplex Stainless Steel Plates
Duplex and Super Duplex stainless steel plates are high-performance alloys designed for extreme corrosion resistance and superior mechanical strength. They consist of a balanced microstructure of austenite and ferrite, making them stronger than conventional stainless steels like SS 304 or SS 316.
These plates are ideal for use in offshore structures, desalination plants, pressure vessels, chemical processing, and marine piping systems.
Duplex and Super Duplex stainless steel plates are used in aggressive, high-chloride, and high-pressure environments where normal stainless steel would fail. Key applications include:
| Property | Duplex (S31803 / S32205) | Super Duplex (S32750 / S32760) |
|---|---|---|
| Yield Strength (min) | 450 MPa | 550 MPa |
| Tensile Strength (min) | 620 MPa | 750 MPa |
| Elongation (% min) | 25% | 25% |
| Hardness (max Brinell) | 293 HB | 310 HB |
| Impact Toughness (at -46°C) | Excellent | Excellent |
| Corrosion Resistance | High | Very High |
These plates combine toughness with corrosion resistance, making them suitable for harsh industrial and marine settings.
| Element | S31803 / S32205 | S32750 / S32760 |
|---|---|---|
| Chromium (Cr) | 21.0 – 23.0 | 24.0 – 26.0 |
| Nickel (Ni) | 4.5 – 6.5 | 6.0 – 8.0 |
| Molybdenum | 2.5 – 3.5 | 3.0 – 5.0 |
| Nitrogen | 0.14 – 0.20 | 0.24 – 0.35 |
| Carbon | Max 0.030 | Max 0.030 |
| Manganese | Max 2.00 | Max 1.20 |
| Silicon | Max 1.00 | Max 1.00 |
The high levels of Cr, Mo, and N enhance resistance to pitting, crevice corrosion, and chlorides.
Duplex and Super Duplex stainless steel plates are produced as per global standards to ensure consistent mechanical strength, corrosion resistance, and weldability.
Standards & Specifications:
Popular Equivalents:
| Standard | Duplex (S31803/S32205) | Super Duplex (S32750/S32760) |
|---|---|---|
| UNS | S31803 / S32205 | S32750 / S32760 |
| EN | 1.4462 | 1.4410 / 1.4501 |
| WNR | 1.4462 | 1.4410 / 1.4501 |
| DIN | X2CrNiMoN22-5-3 | X2CrNiMoCuWN25-7-4 |
These plates often come with dual certification (S31803/S32205), which ensures higher mechanical performance across operating ranges
We stock and supply Duplex & Super Duplex stainless steel plates in a wide range of sizes to meet diverse fabrication needs:
Custom rolled plates can be provided for heavy fabrication, structural reinforcement, and large vessels.
Duplex and Super Duplex plates are supplied in solution annealed condition followed by rapid quenching. This improves:
Plates are tested to ensure Charpy Impact Toughness at -46°C (as per NACE and offshore structural codes).
Due to higher strength and lower ductility than austenitic steels, these plates require specific fabrication practices:
We support buyers with complete fabrication advice and WPS/PQR documentation.
Buy once, and experience steel that lasts in every condition.
Looking for similar or higher-performing grades? Explore our full range:
We also offer matching welding consumables, pipes, fittings, and fasteners in Duplex & Super Duplex grades.
At Hindustan Steel Corporation, we export Duplex and Super Duplex stainless steel plates to over 42 countries, serving industries where corrosion, stress, and seawater exposure demand uncompromised quality.
Top Export Destinations:
Packaging & Documentation:
We ensure zero damage delivery from India’s major ports like Nhava Sheva, Mundra, Kandla, and Chennai.
Choosing between Duplex and Super Duplex depends on:
| Requirement | Choose Grade |
|---|---|
| High chloride corrosion | Super Duplex (S32750/S32760) |
| Balanced cost + strength | Duplex (S31803/S32205) |
| Sour service / NACE MR0175 | Super Duplex with certification |
| Pressure vessels | S32205 / S32750 with ASME SA240 |
| High yield strength & economy | Duplex S32205 |
Tip: Always check for PREN (Pitting Resistance Equivalent Number).
Higher PREN = Better corrosion resistance in seawater and brine
To ensure quality, all our Duplex & Super Duplex plates are supplied with:
Our QC lab ensures every batch meets international quality standards.
Yes, due to its ferritic-austenitic structure, Duplex is partially magnetic.
Oil refineries, desalination plants, pressure vessels, pipelines, offshore rigs.
Duplex: 34–38; Super Duplex: 40–45+, indicating strong pitting resistance.
Yes, with controlled parameters and recommended filler metals like ER2209, ER2594.
Duplex: 450 MPa+, Super Duplex: 550–600 MPa+ depending on grade.
S32205 is a refined version of S31803 with tighter composition for improved strength.
Duplex: S31803, S32205. Super Duplex: S32750, S32760.
Yes, if NACE-compliant and tested. Request NACE MR0175-certified batch.
Yes, Duplex offers better strength and corrosion resistance in many applications.
2B, No.1, No.4, Hot Rolled, Pickled & Passivated.
Up to 150 mm; custom rolling available on order.
Control heat input during welding and avoid prolonged exposure to 600–900°C.
Yes. Plasma, laser, and waterjet cutting available with tolerance control.
Rates vary daily based on size and grade. Request quote for updated pricing.
Request a Price Quote or Download Specifications PDF
Ready to get pricing, availability, and technical specs?
We respond within 4 working hours with the best offer tailored to your size, quantity, and location.
We also support you with:
+91-22-66159018
+91-9820944724
sales@hindustansteel.com hindustansteel1@gmail.com
390/392, Ground Floor, Shankar Mansion, S.V.P. Road, Mumbai – 400004, India
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+91-22-66159018
+91-9820944724
sales@hindustansteel.com hindustansteel1@gmail.com