Is Hastelloy C276 Magnetic

Hastelloy C276 is a nickel-molybdenum-chromium superalloy known for its excellent corrosion resistance in aggressive chemical
environments. One of the most common questions from engineers and buyers is whether Hastelloy C276 is magnetic, especially for
applications involving sensors, chemical equipment, and environments where magnetic interference must be minimized. This article
explains the magnetic properties of Hastelloy C276, why it behaves this way, and how it compares with other alloys.

Is Hastelloy C276 Magnetic?

Hastelloy C276 is generally considered non-magnetic.
Because it is a nickel-based alloy with a fully austenitic microstructure, it does not exhibit magnetic attraction under normal
conditions. Even after cold working, Hastelloy C276 shows extremely low magnetic permeability, making it suitable for
non-magnetic applications.

Why Is Hastelloy C276 Non-Magnetic?

The alloy’s microstructure is stabilized by nickel, which forms an austenitic phase that does not support strong magnetism.
Unlike ferritic or martensitic stainless steels, which contain high iron and can become magnetic, C276’s high nickel content and
solid-solution strengthening elements (Mo, Cr, W) ensure stable non-magnetic performance.

Comparison With Other Alloys

Compared to typical stainless steels, Hastelloy C276 maintains non-magnetic properties even after fabrication, bending, or
forming. Some stainless steels, such as 304 or 316, may become slightly magnetic after cold working, but C276 remains extremely
stable.

Applications Requiring Non-Magnetic Alloys

Hastelloy C276 is widely used when magnetic interference must be minimized:

• Chemical processing equipment where sensors need stable conditions

• Marine and desalination systems requiring corrosion-resistant non-magnetic materials

• Semiconductor and pharmaceutical production where metallic contamination must be minimized

• Pollution control and flue-gas systems with aggressive media

Related Questions

Does Hastelloy C276 become magnetic after machining?
No. Even after machining or cold forming, C276 shows extremely low magnetic permeability and remains non-magnetic.

Is Inconel 625 magnetic like stainless steel?
No. Like C276, Inconel 625 is also non-magnetic because of its nickel-based austenitic structure.

Which Hastelloy grades are non-magnetic?
Most nickel-based Hastelloy grades—such as C22, C276, B2, and X—are non-magnetic due to their high-nickel austenitic
microstructure.