Which type of stainless steel is considered non-ferrous?

Austenitic stainless steel is considered non-ferrous due to its composition, which includes a significant amount of nickel and chromium. These elements contribute to a low magnetic permeability, which means that austenitic stainless steel is not attracted to a magnetic field. This characteristic makes it particularly valuable in magnetic resonance imaging (MRI) environments, as it minimizes interference with the magnetic field generated by the MRI machine and reduces the risk of projectile effects or other safety hazards.

In contrast, duplex, martensitic, and ferritic stainless steels contain varying percentages of iron and often exhibit magnetic properties, making them ferrous. This distinction in magnetic behavior is crucial for maintaining a safe environment in MRI settings, as the presence of ferrous materials can pose significant risks. Thus, identifying austenitic stainless steel as non-ferrous is essential for professionals working in magnetic resonance safety.