904l Placa de aço inoxidável
904L Stainless Steel Plate is a high-performance super austenitic stainless steel designed for extreme corrosion environments, especially strong acids and high-chloride conditions. Comparado com 316L aço inoxidável, it offers significantly better corrosion resistance due to higher nickel, molibdênio, and copper content, but at a much higher cost and with more demanding processing requirements. The selection between the two depends on whether the application requires standard corrosion resistance (316eu) ou extreme chemical resistance (904eu).
- Descrição
904L Stainless Steel Plate is a high-alloy austenitic stainless steel designed for extremely corrosive environments. It contains high levels of chromium, níquel, e molibdênio, and also includes copper to improve resistance to strong acids. É amplamente utilizado em processamento químico, sistemas de dessalinização, and harsh industrial environments where standard stainless steels may fail.
Chemical Composition of 904L Stainless Steel
| Elemento | Contente (%) |
|---|---|
| Cromo (Cr) | 19.0 – 23.0 |
| Níquel (Em) | 23.0 – 28.0 |
| Molibdênio (Mo) | 4.0 – 5.0 |
| Cobre (Cu) | 1.0 – 2.0 |
| Carbono (C) | ≤ 0.02 |
| Manganês (Mn) | ≤ 2.0 |
| Ferro (Fé) | Equilíbrio |
The extremely high nickel and molybdenum content, combined with copper addition, gives 904L outstanding resistance to strong acids and chloride-rich environments.
Key Performance of 904L Stainless Steel Plate
1. Excelente resistência à corrosão
- Exceptional resistance to sulfuric acid and phosphoric acid
- Strong performance in chloride-containing environments
- Superior pitting and crevice corrosion resistance
2. High Alloy Stability
- Very high nickel content improves structural stability
- Copper enhances resistance to reducing acids
- Low carbon content improves intergranular corrosion resistance
3. Boas propriedades mecânicas
- Good toughness and ductility
- Stable performance in harsh chemical environments
- Adequado para estruturas soldadas
4. Excellent Acid Resistance
- One of the best stainless steels for strong acid environments
- Widely used in chemical processing industries
904L vs 316L Stainless Steel
Ambos 904L and 316L are austenitic stainless steels, but 904L is a high-end super-austenitic grade with significantly higher alloy content.
| Propriedade | 904L Aço Inoxidável | 316L Aço Inoxidável |
| Cromo (Cr) | 19–23% | 16–18% |
| Níquel (Em) | 23–28% | 10–14% |
| Molibdênio (Mo) | 4–5% | 2–3% |
| Cobre (Cu) | 1–2% | Nenhum |
| Resistência à corrosão | Excelente (ácidos fortes) | Muito bom (marinho & produtos químicos suaves) |
| Resistência ácida | Muito forte | Moderado |
| Resistência ao cloreto | Excelente | Bom |
| Nível de custo | Muito alto | Médio-Alto |
| Escopo de aplicação | Severe chemical environments | Uso industrial geral |
Comparação de desempenho
1. Resistência à corrosão
- 904L Aço Inoxidável offers significantly higher resistance to strong acids and aggressive chemical environments.
- 316L Aço Inoxidável performs well in marine and mild chemical conditions but is less effective in strong acid applications.
2. Mechanical and Processing Performance
- 316L is easier to process, weld, e forma
- 904L is more difficult to machine due to high alloy content
- Both maintain good toughness and weldability
3. Cost Difference
- 904L has much higher cost due to:
- High nickel content
- High molybdenum content
- Copper addition
- 316L is more economical and widely available
Aplicações Típicas
904L Stainless Steel Plate
- Equipamento de processamento químico
- Sulfuric acid and phosphoric acid plants
- Offshore and marine systems with severe corrosion
- Heat exchangers in aggressive environments
316L Stainless Steel Plate
- Estruturas marinhas
- Equipamento de processamento de alimentos
- Máquinas farmacêuticas
- General chemical and industrial equipment
