321 Plaque SS
321 stainless steel plate is a titanium-stabilized austenitic stainless steel designed for high-temperature and welded applications. Its excellent resistance to intergranular corrosion and strong thermal stability make it ideal for aerospace, traitement chimique, and industrial heat systems. Par rapport à 304 acier inoxydable, 321 provides superior performance in environments involving continuous heating and welding exposure.
- Description
321 stainless steel plate is an austenitic chromium-nickel stainless steel stabilized with titanium. It is designed to provide excellent resistance to intergranular corrosion, especially in high-temperature service environments. Par rapport à 304 acier inoxydable, 321 offers better stability under heat exposure, ce qui le rend largement utilisé dans l'aérospatiale, traitement chimique, and thermal equipment.
Composition chimique de 321 Plaque en acier inoxydable
The key feature of 321 stainless steel is the addition of titanium, which stabilizes carbon and prevents chromium carbide precipitation.
| Élément | Contenu (%) |
|---|---|
| Chrome (Cr) | 17.0–19,0 |
| Nickel (Dans) | 9.0–12.0 |
| Titane (De) | ≥ 5 ×C (typically 0.4–0.7) |
| Carbone (C) | ≤ 0.08 |
| Manganèse (Mn) | ≤ 2.00 |
| Silicium (Et) | ≤ 1.00 |
| Phosphore (P.) | ≤ 0.045 |
| Soufre (S) | ≤ 0.03 |
| Fer (Fe) | Équilibre |
Propriétés mécaniques de 321 Acier inoxydable
321 stainless steel maintains good strength and ductility across a wide temperature range.
| Propriété | Valeur typique |
|---|---|
| Résistance à la traction | 515–750 MPa |
| Limite d'élasticité | ≥ 205 MPa |
| Élongation | ≥ 40% |
| Dureté | ≤ 201 HB |
| Densité | 7.9 g/cm³ |
Principales caractéristiques de performance
1. Excellente résistance aux hautes températures
321 stainless steel performs well in continuous service up to around 800–900°C, making it suitable for heat-exposed environments.
2. Strong Resistance to Intergranular Corrosion
The titanium stabilization prevents carbide precipitation during heating, which significantly improves resistance to intergranular corrosion after welding or heat exposure.
3. Good Weldability
321 stainless steel can be welded using standard austenitic stainless steel methods without the need for post-weld heat treatment in most cases.
4. Good Mechanical Stability
It maintains stable mechanical properties in both low and high temperature environments, with good toughness and fatigue resistance.
Applications courantes de 321 Plaque en acier inoxydable
321 stainless steel plate is widely used in high-temperature and welded structural applications.
Les applications typiques incluent:
- Aircraft exhaust systems
- Composants de moteur à réaction
- Échangeurs de chaleur
- Boiler equipment
- Composants du four
- Joints de dilatation
- Équipement de traitement chimique
- Appareils à pression
- Conduites à haute température
- Thermal insulation systems
321 Acier inoxydable vs 304 Acier inoxydable
| Propriété | 321 Acier inoxydable | 304 Acier inoxydable |
|---|---|---|
| Stabilizer | Titane (De) | Aucun |
| High Temperature Resistance | Mieux | Modéré |
| Résistance à la corrosion intergranulaire | Fort | Standard |
| Weld Performance | Excellent | Bien |
| Utilisation typique | Heat-resistant systems | Usage général |
