Welcome To Pearl Steel Industries
Mon-Sat 8:00 - 6:30 Sunday Closed
Duplex and Super Duplex Stainless Steels are widely used in industries where high strength, corrosion resistance, and long service life are critical. From oil & gas and petrochemical plants to marine and offshore structures, these materials offer a perfect balance of performance and cost efficiency.
This guide explains Super Duplex and Duplex Stainless Steel grades, their equivalents, products, applications, and how to choose the right material for your project.
Duplex Stainless Steel has a dual microstructure of austenite and ferrite, typically in a 50:50 ratio. This structure provides:
- Higher strength than austenitic stainless steel
- Excellent resistance to stress corrosion cracking
- Good weldability
- Better cost efficiency due to lower nickel content
Common grades include Duplex 2205 UNS S32205, UNS S31803, and 1.4462 Duplex 2205.
Super Duplex Stainless Steel is an enhanced version of duplex steel with higher chromium, molybdenum, and nitrogen content, giving it superior corrosion resistance and strength.
Key advantages:
- Exceptional resistance to pitting and crevice corrosion
- Excellent performance in chloride-rich environments
- Higher PREN value than standard duplex grades
Popular grades include Super Duplex UNS S32750, UNS S32760, 1.4410 Super Duplex, and 2507 Super Duplex.
UNS S32750 Equivalent grades include:
- EN 1.4410
- ASTM A182 F53
- ASTM A276 S32750
This grade is commonly used for Super Duplex UNS S32750 pipes, pipe fittings, and offshore structural components where extreme corrosion resistance is required.
ASTM A276 S32760 offers enhanced resistance to:
- Seawater corrosion
- Acidic and chloride environments
Products commonly manufactured using this grade include:
- UNS S32760 Tubes
- UNS S32760 Fasteners Suppliers
- UNS S32760 Bolts Suppliers
Duplex 2205 UNS S32205 is the most widely used duplex grade.
Key features:
- High tensile strength
- Good resistance to localised corrosion
- Suitable for moderate chloride environments
- Duplex 2205 Plate Supplier
- Duplex 2205 Tube Distributor
- Duplex 2205 UNS S32205 Tubes Supplier
- Duplex 2205 Fasteners Stockist
- 2205 Duplex Compression Tube Fittings Stockist
Duplex UNS S31803 is a leaner duplex grade suitable for structural and pressure applications.
Available products include:
- UNS S31803 Pipes Supplier
- Duplex UNS S31803 pipe fittings
- Duplex UNS S31803 flanges
- Duplex UNS S31803 supplier
Pipes & Tubes
- Super Duplex UNS S32750 pipes
- 2507 Duplex Pipe Suppliers
- 2507 Duplex Pipe Distributor
- UNS S32205 Tube Suppliers
Flanges
- Duplex UNS S32205 flanges
- Duplex UNS S31803 flanges
Fasteners
- UNS S32760 Fasteners Suppliers
- UNS S32760 Bolts Suppliers
- UNS S32205 Bolts Importer
Pipe Fittings
- Super Duplex UNS S32750 pipe fittings
- Duplex UNS S31803 pipe fittings
| Property | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| Strength | High | Very High |
| Corrosion Resistance | Excellent | Superior |
| Chloride Resistance | Moderate | Extreme |
| Cost | Lower | Higher |
| Typical Use | Chemical, Structural | Offshore, Marine |
- Oil & Gas pipelines
- Offshore platforms
- Heat exchangers
- Pressure vessels
- Marine equipment
- Chemical processing plants
When selecting material, consider:
- Chloride exposure level
- Operating temperature and pressure
- Corrosion resistance requirement
- Budget and availability
A trusted supplier ensures:
- Certified raw materials
- ASTM / EN compliance
- Proper heat treatment
- Mill Test Certificates (MTC)
- Consistent quality and on-time delivery
Understanding the differences between Duplex and Super Duplex Stainless Steels helps you choose the right material for durability, safety, and long-term performance. Whether you need pipes, tubes, flanges, fasteners, or fittings, selecting the correct grade ensures efficiency and reliability in demanding applications.