- Description
347 stainless steel plate is an austenitic chromium-nickel stainless steel stabilized with niobium (columbium). It is designed to provide excellent resistance to intergranular corrosion, especially in high-temperature environments and after welding. Par rapport à 304 et 321 stainless steels, 347 offers superior stability in long-term elevated temperature service.
Composition chimique de 347 Plaque en acier inoxydable
The key feature of 347 stainless steel is niobium (Nb) stabilization, which prevents chromium carbide precipitation.
| Élément | Contenu (%) |
|---|---|
| Chrome (Cr) | 17.0–19,0 |
| Nickel (Dans) | 9.0–13.0 |
| Niobium (Nb) | ≥ 10 ×C (typically 0.8–1.0) |
| 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 347 Acier inoxydable
347 stainless steel maintains stable mechanical strength and good toughness under both room and elevated temperatures.
| 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
347 stainless steel performs well in continuous service at temperatures up to 870°C, making it suitable for thermal and high-heat industrial systems.
2. Strong Resistance to Intergranular Corrosion
Niobium stabilization prevents carbide precipitation during welding or heat exposure, significantly improving resistance to intergranular corrosion compared with non-stabilized grades like 304.
3. Good Weldability
347 stainless steel can be welded using standard methods without requiring post-weld heat treatment in most applications. It is especially suitable for heavy welded structures.
4. Propriétés mécaniques stables
It maintains good strength, ductilité, and oxidation resistance in long-term thermal cycling conditions.
Applications courantes de 347 Plaque en acier inoxydable
347 stainless steel plate is widely used in high-temperature and corrosion-resistant welded equipment.
Les applications typiques incluent:
- Échangeurs de chaleur
- Composants de chaudière
- Pièces de four
- Jet engine exhaust systems
- Équipement de traitement chimique
- Appareils à pression
- Joints de dilatation
- High-temperature piping systems
- Petrochemical industry equipment
- Systèmes de production d'énergie
347 Acier inoxydable vs 321 Acier inoxydable
| Propriété | 347 Acier inoxydable | 321 Acier inoxydable |
|---|---|---|
| Stabilizer | Niobium (Nb) | Titane (De) |
| High Temperature Stability | Plus haut | Bien |
| Résistance à la corrosion intergranulaire | Very strong | Fort |
| Weld Performance | Excellent | Excellent |
| Utilisation typique | Severe thermal environments | General high-temperature use |
