- 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 haute résistance, excellente résistance à la corrosion, and good weldability, making duplex stainless steels widely used in marin, chimique, and oil & gas industries.
Compared with conventional stainless steels like 304 ou 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.
Notes typiques
- 2205 (États-Unis S32205 / S31803)
- 2304 (États-Unis S32304)
Caractéristiques
- 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, molybdène, et azote, offering superior performance.
Notes typiques
- 2507 (États-Unis S32750)
- États-Unis S32760 (zéro 100 type)
Caractéristiques
- 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.
Notes typiques
- 2101 (États-Unis S32101)
- LDX 2404 (UNS S82441)
Caractéristiques
- Lower nickel content reduces cost
- Résistance modérée à la corrosion
- Suitable for structural and less aggressive environments
Duplex Stainless Steel Grades Overview Table
| Catégorie | Grade | Numéro un | Principales fonctionnalités | Applications typiques |
|---|---|---|---|---|
| Duplex maigre | 2101 | S32101 | Cost-effective, moderate strength | De construction, construction |
| Duplex maigre | 2304 | S32304 | Bonne résistance à la corrosion | Réservoirs de stockage, usage général |
| Duplex standard | 2205 | S32205 / S31803 | Performances équilibrées | Chimique, marin |
| Super-Duplex | 2507 | S32750 | Haute résistance à la corrosion | En mer, systèmes d'eau de mer |
| Super-Duplex | S32760 | S32760 | Extreme durability | Huile & gaz, desalination |
Key Characteristics of Duplex Stainless Steel
- Haute résistance (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
Applications courantes
Duplex stainless steel sheets are widely used in:
Oil and Gas Industry
- Pipelines and pressure vessels
- Plateformes offshore
Génie maritime
- Composants du navire
- Seawater handling systems
Chemical Processing
- Réservoirs de stockage
- Échangeurs de chaleur
Construction and Infrastructure
- Bridges and structural components
- Water treatment facilities
Teda Ganghua – Capacité d’approvisionnement
Teda Ganghua supplies a wide range of duplex stainless steel sheets:
- Full grade coverage (lean, standard, super duplex)
- Various thickness and size options
- Services de découpe et de fabrication sur mesure
- Strict quality inspection and export standards
Avec une forte capacité d'inventaire et de traitement, Teda Ganghua fournit solutions fiables en acier inoxydable duplex pour les applications industrielles exigeantes.
