Overview

As a leading supplier and manufacturer in China, AEETHER provides cost-effective Hastelloy C-276 products.

Hastelloy C-276 (UNS N10276 / W.Nr. 2.4819) is a very commonly used nickel-chromium-molybdenum alloy. Among superalloys, it is known for its high molybdenum content.

First, as a corrosion-resistant element, molybdenum brings very high resistance to reductive corrosion to the alloy. By combining with nickel and chromium, Hastelloy C-276 has very good overall corrosion resistance. Compared with stainless steel, its excellent resistance to stress corrosion cracking in chloride-containing solutions cannot be replaced.

Secondly, the solid solution strengthening effect of molybdenum and tungsten elements is very obvious, and they bring very high strength to Hastelloy C-276 alloy. Like other nickel alloys, Hastelloy C-276 has good ductility. It is easy to shape and weld.

Hastelloy C-276 alloy is well suited for gas melting arc (GMA/MIG), gas tungsten arc (GTA/TIG) and shielded metal arc (SMA/Stick) welding processes. Hastelloy C-276 is ideal for marine applications. Its corrosion resistance makes it resistant to various corrosive substances in flowing seawater for a long time. However, Hastelloy C-276 also has good overall performance at high temperatures. It is very suitable for the preparation equipment of various corrosive chemicals or the reactor of various acidic substances.

Corrosion Resistance

First, Hastelloy C-276 alloy exhibits extremely high resistance to chloride-induced pitting and crevice corrosion. These forms of corrosion are particularly prone to occur in austenitic stainless steels.

Second, similar to other nickel alloys, one of the key features of Hastelloy C-276 is its resistance to chloride-induced stress corrosion cracking.

Additionally, Hastelloy C-276 has demonstrated exceptional ability to resist seawater corrosion. Sea water is the most common salt water solution. It is widely used in marine and offshore oil rigs and as a coolant in coastal installations.

Finally, although the microstructural inhomogeneity of the weld may result in slightly higher corrosion rates (relative to a uniformly forged product), Hastelloy C-276 is still able to resist corrosion in the weld area and exhibit excellent performance.

Mechanical Behavior

Hastelloy C-276 is a solid solution alloy. This alloy has good solid solution strengthening effect. Hastelloy C-276 is stronger than stainless steel, and even stronger than most solid solution alloys. Therefore, it is also easier to increase strength through cold working.

Note, however, that cold working will generally affect the resistance of Hastelloy C-276 to stress corrosion cracking. Proper annealing is very important for cold worked parts in order to achieve optimum corrosion performance. The corrosion resistance and ductility of this alloy can be improved by proper annealing process. In addition, for Hastelloy C-276, it is recommended to use a faster cooling rate for annealing.