What is the difference between 304 e 316? These are the two most common types of stainless steel, and with so many grades available, making the right choice is key. Understanding the nuances between them is essential, and reliable and professional stainless steel tube manufacturers and suppliers will help you make an informed choice. We focus on their applications in tubo de aço inoxidável e acessórios. Before reading this article, please understand o que é aço 304 e o que é o aço 316.
What's The Difference Between 304 And 316? The Core Distinction!
304 and 316 are both aços inoxidáveis austeníticos with good corrosion resistance. The main difference is in their chemical composition: 316 contains molibdênio, while 304 contains no molybdenum. Molybdenum significantly enhances corrosion resistance. The effect of molybdenum is particularly noticeable in environments rich in chlorides. This makes 316 a premium choice.
Key Differences: 304 and 316 Explained
316 contains 2-3 per cent molybdenum, while 304 contains no molybdenum. This element is the main difference and significantly improves corrosão resistência.
304 is very resistant to general atmospheric corrosion. 316 has greater corrosion resistance, resisting corrosão e fenda corrosion. Excellent in chlorinated environments such as seawater.
You May Also Want To Know:
O que é temperatura crítica de corrosão de pite e temperatura crítica de corrosão de fenda
304 is generally more economical and offers excellent value for general purpose applications. 316 has a higher material cost, and the increased performance of 316 in critical applications justifies the investment.
Both grades have good performance at elevated temperatures. 316 has better creep strength due to the presence of molybdenum and maintains higher integrity at elevated temperatures.
Both 304 and 316 are easy to weld. For heavily welded sections, it is best to use low carbon materials (304L, 316L) to prevent sensitisation.
Talvez você também queira ler:
Stainless steel welded pipe introduction
Chemical Composition: 304 vs. 316
| Elemento | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|
| Cr | 17.5-19.5 | 16.0-18.0 |
| Ni | 8.0-10.5 | 10.0-14.0 |
| Mo | None | 2.0-3.0 |
O que fazemos
Mechanical Properties: 304 vs. 316
| Elemento | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|
| Resistência à tracção | ≥515MPa (75ksi) | ≥515MPa (75ksi) |
| Resistência ao escoamento (0,2% Offset) | ≥205MPa (30ksi) | ≥205MPa (30ksi) |
| Alongamento | ≥40 | ≥40 |
| Dureza (HRB) | ≤92 | ≤95 |
| Densidade | 8,0g/cm³ | 8,0g/cm³ |
| Faixa de fusão | 1400-1450°C | 1370-1400°C |
Typical Applications: 304 vs. 316 Stainless Steel Pipe & Fittings
| Tipo de aplicativo | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|
| Serviço geral | Water lines, basic food processing | Marine, Chemical Processing, Medical |
| Corrosive Env. | Mild acids, atmospheric exposure | Chlorides, Seawater, Strong Acids |
| High Hygiene | General food, dairy | Pharmaceutical, Surgical, Brewery |
| Structural | Architecture, railings | Offshore, Coastal, Industrial Exhaust |
| Temperatura | Moderate to High | Higher temp process lines |
Making the Right Choice for Your Piping Systems
- Choose 304 for general purpose applications, which is cost-effective. It has good corrosion resistance and is ideal for freshwater systems.
- Choose 316 for harsh environments, suitable for marine environments. Can be used in chemical processing, resistant to chlorides and high temperatures.
Sourcing Stainless Steel Pipe and Fittings
- Verify Grades: Always confirm the exact grade and request a Material Test Report (MTR).
- Compliance: Check for compliance with ASTM, ASME, and other relevant standards.
- Supplier reputation: Work with trusted manufacturers. They can provide reliable 304 and 316 products and have certificações(por exemplo ISO 9001 e CE-PED).
- Product form: Specify the correct pipe size or fitting type (e.g., sem emendas, butt-welded fittings).
Veja o documento de especificação do tubo de aço inoxidável
Talvez você também queira ler:
O que é o aço 304? A opção ideal para muitas aplicações!
O que é o aço 304l?
Entendendo o que é o aço 316 para necessidades críticas!
O que é o aço inoxidável 316Ti?
Aço Inoxidável 316 VS 316L
Aço inoxidável austenítico: 316 LN
O que é o aço inoxidável 304h?
O que é o aço inoxidável 316H?
O que são os aços inoxidáveis H e L - Duplex Pipe
O significado das letras após os tipos de aço inoxidável
Contate-nos
- RM901 No.22 Tangjiaqiao Road Wenzhou China
- +86 577 8551 1171
- [email protected]
- https://www.kaysuns.com/
PT 
EN 
RU 
ES 
FR 
