Introduction:
Alloy C-276 was developed in 1965. After 1970, it began to be produced using external refining processes such as AOD (Argon Oxygen Decarburization) and VOD (Vacuum Oxygen Decarburization) to achieve ultra-low carbon content (C ≤ 0.02%) and high intrinsic purity. To reduce the susceptibility and brittleness of Hastelloy C alloys to intergranular corrosion after welding or hot forming—and to overcome the serious drawback that conventional Hastelloy C requires solution treatment after welding or hot forming—both carbon content (C ≤ 0.02%) and silicon content (≤ 0.08%) were minimized. Lowering carbon reduces carbide precipitation in the alloy, while reducing silicon minimizes intermetallic phase formation, thereby improving the alloy’s resistance to intergranular corrosion. At the same time, the alloy’s ductility, toughness, and workability are significantly enhanced.

Applications:
Alloy C-276 can be manufactured into sheets (thin, medium, and thick), pipes, wires, strips, bars, as well as forgings and castings. Its applications are generally similar to other Hastelloy C alloys. However, when equipment or components require welding and must avoid intergranular corrosion after welding or hot forming, C-276 is typically the preferred choice. Currently, 00Cr16Ni60Mo16W2 (Hastelloy C-276) is widely used in the United States.