In harsh environments such as chemical, marine and energy, the choice of corrosion-resistant pipes is crucial. As two high-end corrosion-resistant materials, titanium tubes and Hastelloy tubes each have unique advantages, and the specific choice depends on the application environment.
Corrosion resistance of titanium tubes
Titanium tubes are known for their excellent seawater corrosion resistance, thanks to the dense oxide film naturally formed on their surface. It shows near-perfect resistance to chlorides, seawater, and oxidizing media such as nitric acid, with corrosion rates as low as 0.001mm/year or less. In addition, titanium tubes are lightweight and high in strength, making them ideal for marine engineering and coastal power stations.
However, titanium tubes perform poorly in reducing acids such as hydrochloric acid and sulfuric acid, especially in high temperature environments. It is extremely sensitive to hydrofluoric acid, and even trace amounts can cause severe corrosion.
Corrosion resistance advantages of Hastelloy tubes
Hastelloy tubes are experts in handling strong acid environments. It shows amazing corrosion resistance to hydrochloric acid and sulfuric acid of various concentrations and temperatures, and can also remain stable in complex chemical media. Hastelloy alloy series, such as C-276 and B-2, are specially designed for different corrosive environments and can resist pitting and crevice corrosion.
But Hastelloy alloy tubes are expensive, usually 2-3 times that of titanium tubes, and are difficult to process, requiring special welding processes. Its density is also nearly twice that of titanium.
How to choose?
Titanium tubes are preferred when the application involves seawater, saltwater, or oxidizing media, especially when a lightweight design is required
Hastelloy alloy tubes are preferred when dealing with strong reducing acids, complex mixed media, or high-temperature corrosive environments
The final decision should be based on the specific media conditions (composition, concentration) of titanium tubes and Hastelloy tubes.
