Comparison of 0.1mm/y isocorrosive lines

Active metals (titanium, zirconium, tantalum) have very good corrosion resistance, especially titanium materials have a wide range of applications in China, mainly used to replace some stainless steel can not adapt to the corrosion environment. However, TITANIUM PROVIDES PROTECTION MAINLY through the formation of a dense oxide film, which is vulnerable to corrosion in environments with strong reducing or high airtightness (lack of oxygen) (flange, gasket sealing face). And titanium can only be used at 300C. Although zirconium and tantalum have excellent corrosion resistance, their applications are limited due to their high prices. All active metals should not be used in fluorinated environments. Most Hastelloy alloys can be used in a wide range of environments and temperatures, and are one of the few metals that can resist fluoride ions.
Haselloy itself is a nickel-based alloy, but different from the general pure nickel (Ni200) and Monel, it uses chromium-molybdenum as the main alloying element, aiming to improve the adaptability to various media and temperatures, and has been specially optimized for different industrial applications. At present, the chemical industry generally pursues high production capacity, and constantly improves the process to increase the temperature and pressure to speed up the reaction speed, so that the production is prone to unpredictable situations, resulting in unplanned maintenance. Hastelloy is precisely such a need, and is suitable for a variety of unpredictable harsh environments, to minimize unplanned maintenance. At the same time, it also has good machining and welding performance, easy to maintain on site.