- Description
Duplex stainless steel sheet is a type of stainless steel that combines austenitic and ferritic microstructures, typically in a 50/50 ratio. This dual-phase structure provides high strength, excellent corrosion resistance, and good weldability, making duplex stainless steels widely used in marine, chemical, and oil & gas industries.
Compared with conventional stainless steels like 304 or 316, duplex grades offer higher strength and better resistance to stress corrosion cracking.
Main Types of Duplex Stainless Steel Grades
Duplex stainless steels are generally classified into three main categories:
1. Standard Duplex Stainless Steel
These are the most commonly used duplex grades with balanced performance.
Typical Grades
- 2205 (UNS S32205 / S31803)
- 2304 (UNS S32304)
Characteristics
- Good balance of strength and corrosion resistance
- Widely used in general industrial applications
- Cost-effective compared to super duplex
2. Super Duplex Stainless Steel
Super duplex grades contain higher levels of chromium, molybdenum, and nitrogen, offering superior performance.
Typical Grades
- 2507 (UNS S32750)
- UNS S32760 (Zeron 100 type)
Characteristics
- Excellent resistance to pitting and crevice corrosion
- High strength in harsh environments
- Suitable for offshore and marine conditions
3. Lean Duplex Stainless Steel
Lean duplex grades have lower alloy content, providing a more economical option.
Typical Grades
- 2101 (UNS S32101)
- LDX 2404 (UNS S82441)
Characteristics
- Lower nickel content reduces cost
- Moderate corrosion resistance
- Suitable for structural and less aggressive environments
Duplex Stainless Steel Grades Overview Table
| Category | Grade | UNS Number | Key Features | Typical Applications |
|---|---|---|---|---|
| Lean Duplex | 2101 | S32101 | Cost-effective, moderate strength | Structural, construction |
| Lean Duplex | 2304 | S32304 | Good corrosion resistance | Storage tanks, general use |
| Standard Duplex | 2205 | S32205 / S31803 | Balanced performance | Chemical, marine |
| Super Duplex | 2507 | S32750 | High corrosion resistance | Offshore, seawater systems |
| Super Duplex | S32760 | S32760 | Extreme durability | Oil & gas, desalination |
Key Characteristics of Duplex Stainless Steel
- High strength (about twice that of austenitic stainless steel)
- Excellent resistance to stress corrosion cracking
- Good pitting and crevice corrosion resistance
- Better thermal conductivity than austenitic grades
- Good weldability with proper control
Common Applications
Duplex stainless steel sheets are widely used in:
Oil and Gas Industry
- Pipelines and pressure vessels
- Offshore platforms
Marine Engineering
- Ship components
- Seawater handling systems
Chemical Processing
- Storage tanks
- Heat exchangers
Construction and Infrastructure
- Bridges and structural components
- Water treatment facilities
Teda Ganghua – Supply Capability
Teda Ganghua supplies a wide range of duplex stainless steel sheets:
- Full grade coverage (lean, standard, super duplex)
- Various thickness and size options
- Custom cutting and fabrication services
- Strict quality inspection and export standards
With strong inventory and processing capability, Teda Ganghua provides reliable duplex stainless steel solutions for demanding industrial applications.
