ANNEALING vs HEAT TREATMENT
The definition of annealing is: "heat metal and allow it to cool slowly, in order to remove internal stresses and toughen or soften it." While we need to anneal permalloy 80 and other magnetic shielding alloys during the magnetic shield fabrication process, we do not anneal for maximum magnetic permeability. As noted in the definition, the annealing step is done to relieve stress within the material that was introduced as a part was being formed or bent.When we are heat-treating our HyMu 80 magnetic shielding materials, we are actually changing the physical properties by enlarging the grain structure, allowing for more magnetic flux to be absorbed by the magnetic shield.
In conclusion, both annealing and heat-treating are necessary during the magnetic shield fabrication process, but both serve a very different purpose. If you need to relieve stress in material, soften or toughen it, you want to anneal it. If you are trying
to achieve maximum permeability, you want to heat treat the material.
It should also be noted that material in our kinds have been annealed for forming possible, but is not heat-treated for maximum magnetic permeability.
If you still have questions about heat treating and annealing, do not hesitate to contact Mr.Paul with any specific questions.