| Composition | SUS316 | 316Ti |
|---|---|---|
| Chromium (Cr) | 16-18% | 16-18% |
| Nickel (Ni) | 10-14% | 10-14% |
| Molybdenum (Mo) | 2-3% | 2-3% |
| Titanium (Ti) | None | Ti ≥ 5×C, usually 0.5% to 0.8% |
| Carbon (C) | ≤0.08% | ≤0.08% |
SUS316: SUS316 offers good resistance to intergranular corrosion, but in certain high-temperature welding environments, it may experience intergranular corrosion due to the presence of carbon. Especially after welding, if not properly heat-treated (like solution annealing), welded areas might be susceptible to intergranular corrosion.
316Ti: The addition of titanium in 316Ti forms stable titanium carbides (TiC), which prevent the formation of chromium carbides and thus effectively avoid intergranular corrosion. 316Ti is particularly suitable for applications where welding post-heat treatment is not possible, especially in high-temperature environments.
SUS316: SUS316 performs excellently in high-temperature environments, with good heat resistance, capable of being used at temperatures up to 925°C. However, prolonged exposure above this temperature range, particularly in sulfur and oxidizing environments, may lead to a decline in its performance.
316Ti: Due to the addition of titanium, 316Ti exhibits better thermal stability. Titanium enhances the alloy's resistance to high-temperature degradation, prevents intergranular corrosion at elevated temperatures, and improves oxidation resistance. Therefore, 316Ti offers better performance in high-temperature environments, especially in long-term exposure scenarios.
Summary: For prolonged high-temperature use, 316Ti performs slightly better than SUS316.
SUS316: SUS316 has excellent corrosion resistance due to its high molybdenum content. It performs well in environments like seawater, salt solutions, and acidic media, making it ideal for industries like chemical, food, and pharmaceutical industries.
316Ti: While 316Ti offers similar corrosion resistance to SUS316, its titanium content enhances its durability in some extreme environments, particularly in high-temperature and corrosive media.
Summary: In most environments, both SUS316 and 316Ti offer comparable corrosion resistance, but 316Ti may outperform in extremely high-temperature or post-welding conditions.
SUS316: SUS316 is relatively more affordable, making it suitable for various industrial applications.
316Ti: Due to the addition of titanium, the production process of 316Ti is more complex, making it more expensive than SUS316.
Summary: SUS316 is more cost-effective, especially when the application does not involve high temperatures or welding concerns. 316Ti, while more expensive, provides better performance in harsher environments.
SUS316: Ideal for general seawater, chemical, and food industry applications, particularly in environments that have not undergone high-temperature treatments, such as piping systems and heat exchangers.
316Ti: Best suited for environments that require high-temperature stability and resistance to intergranular corrosion, particularly in situations where heat treatment is not possible post-welding, such as high-temperature equipment, and exposed welding areas.
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