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Transformer core annealing treatment is an effective process to repair electrical steel magnetic performance. It can eliminate processing damage and restore original material magnetism.

Annealing eliminates residual mechanical stress of electrical steel. Shearing, stamping and stacking bring tiny internal stress. Stress distorts grain structure and increases iron loss. High-temperature annealing releases residual stress completely.

It repairs local magnetic domain damage caused by processing. Cutting burrs and extrusion destroy partial magnetic domain arrangement. Annealing promotes grain recrystallization. It rearranges magnetic domains in an orderly manner.

It reduces additional loss caused by processing defects. Repaired grain structure lowers hysteresis loss. The overall no-load loss of transformer cores decreases obviously.

It improves magnetic permeability and magnetization stability. Standard annealing makes grain texture more regular. Magnetic flux transmission resistance is reduced. Core magnetization performance is more stable.

It suppresses partial magnetic aging tendency. Annealing eliminates internal microscopic defects. It delays magnetic aging speed of electrical steel in later operation.

Reasonable annealing temperature is key to repair effect. 750℃ to 800℃ is the optimal temperature range. Excessively high temperature damages insulating coatings. Low temperature cannot achieve stress relief effect.

Improper annealing will cause side effects. Overheating leads to coating ablation and grain overgrowth. It causes irreversible performance decline.

In short, standardized annealing treatment effectively repairs electrical steel processing performance damage. It significantly improves the finished core magnetic indexes.