

347 Piatto inossidabile
347 stainless steel plate is a niobium-stabilized austenitic stainless steel designed for excellent resistance to intergranular corrosion and high-temperature performance. It is widely used in chemical processing, generazione di energia, and thermal equipment where welded structures are exposed to continuous or cyclic heating. Rispetto a 321 acciaio inossidabile, 347 offers improved stability in more demanding high-temperature service conditions.
Richiesta rapida
- Descrizione
347 stainless steel plate is an austenitic chromium-nickel stainless steel stabilized with niobium (colombio). It is designed to provide excellent resistance to intergranular corrosion, especially in high-temperature environments and after welding. Rispetto a 304 E 321 acciai inossidabili, 347 offers superior stability in long-term elevated temperature service.
Composizione chimica di 347 Piastra in acciaio inossidabile
La caratteristica fondamentale di 347 stainless steel is niobium (N.B) stabilization, which prevents chromium carbide precipitation.
| Elemento | Contenuto (%) |
|---|---|
| Cromo (Cr) | 17.0–19.0 |
| Nichel (In) | 9.0–13.0 |
| Niobio (N.B) | ≥ 10 ×C (typically 0.8–1.0) |
| Carbonio (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicio (E) | ≤ 1.00 |
| Fosforo (P) | ≤ 0.045 |
| Zolfo (S) | ≤ 0.03 |
| Ferro (Fe) | Bilancia |
Proprietà meccaniche di 347 Acciaio inossidabile
347 stainless steel maintains stable mechanical strength and good toughness under both room and elevated temperatures.
| Proprietà | Valore tipico |
|---|---|
| Resistenza alla trazione | 515–750MPa |
| Forza di snervamento | ≥ 205 MPa |
| Allungamento | ≥ 40% |
| Durezza | ≤ 201 HB |
| Densità | 7.9 g/cm³ |
Principali caratteristiche prestazionali
1. Eccellente resistenza alle alte temperature
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. Buona saldabilità
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. Proprietà meccaniche stabili
It maintains good strength, duttilità, and oxidation resistance in long-term thermal cycling conditions.
Applicazioni comuni di 347 Piastra in acciaio inossidabile
347 stainless steel plate is widely used in high-temperature and corrosion-resistant welded equipment.
Le applicazioni tipiche includono:
- Scambiatori di calore
- Componenti della caldaia
- Parti della fornace
- Jet engine exhaust systems
- Attrezzature per il trattamento chimico
- Recipienti a pressione
- Giunti di dilatazione
- High-temperature piping systems
- Petrochemical industry equipment
- Sistemi di generazione di energia
347 Stainless Steel vs 321 Acciaio inossidabile
| Proprietà | 347 Acciaio inossidabile | 321 Acciaio inossidabile |
|---|---|---|
| Stabilizer | Niobio (N.B) | Titanio (Di) |
| High Temperature Stability | Più alto | Bene |
| Resistenza alla corrosione intergranulare | Molto forte | Forte |
| Prestazioni di saldatura | Eccellente | Eccellente |
| Uso tipico | Severe thermal environments | General high-temperature use |












