Magnetic annealing is a bulk heat treatment performed in controlled atmosphere, characterized by heating followed by cooling in air. The process is intended to modify and restore the magnetic properties of materials.
The treatment enables the elimination of internal stresses, improvement of magnetic properties, and uniformity of magnetic response between parts of the same batch, ensuring the absence of surface oxidation.
The process is applicable to soft ferrous alloys and magnetically soft alloys, special magnetic alloys, and stainless steels.
CHARACTERISTICS
Type of treatment:
Bulk heat treatment in controlled atmosphere
Process description:
the material is heated to temperatures above the crystallization point (Curie point), depending on the alloy, following specific heating curves. The holding phase is followed by controlled cooling cycles defined for each ferrous alloy.
Processing temperatures may range from approximately 500 to 1300°C, depending on the alloy and the required performance.
ADVANTAGES
- Increased magnetic permeability
- Stable magnetic response between identical parts
- Absence of residual magnetism
- Restoration of original magnetic properties
PROCESSABLE MATERIALS
- soft ferrous alloys (Armco iron, silicon iron, cobalt iron)
- special magnetic alloys (Ni-Fe, FeCo49V2)
- stainless steels (austenitic grades AISI 304, AISI 316)
- rigid magnets based on AlNiCo