Is C-22 the same as C-276?Is C-22 the same as C-276?
In many applications Hastelloy C-22 and C-276 can be used interchangeably. However, they are different nickel alloys. Haynes International, the original manufacturer of both materials, states C-22 has “better overall corrosion resistance than other Ni-Cr-Mo alloys available today, including Hstelloy C-276 and C-4 alloys and alloy 625.” C-22 contains 22% chromium, compared to the 16% in C-276, which is one factor contributing to C-22 alloy's improved performance.
Are weld insert rings or special welding wire required to join C22 alloy?
Due to very low carbon content, welded wrought C-22 alloy does not form the microstructures deficient in corrosion-resistant elements typically produced in stainless steel and 6% molybdenum alloys during welding. Therefore, overalloying with weld insert rings or other higher alloy filler material, is usually not required.
Can AL-6XN alloy be welded to C-22?
C22 alloy fittings can be welded directly to AL-6XN tubing and vessels without weld insert rings. If filler wire is required to make the weld, C22 alloy filler wire (ER NiCrMo-10) is recommended. If the surface area of the AL-6XN portion of the weldment is much greater than the surface area of the C22 alloy component, the likelihood of galvanic corrosion attack is minimized.
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