Abstract: The effects of the ball scribing on magnetic properties of high permeability grainoriented silicon steels， including the iron loss， coercive force， relative permeability， and Barkhausen noise were investigated. The results showed that the iron loss and coercive force of the high permeability grainoriented silicon steels apparently decreased 162% and 147% respectively after 8mm ball scribing and they both decreased with the decrease of the scribing spacing at the same magnetic flux density. At high flux densities， the permeability of the high permeability grainoriented steels apparently increased， and Barkhausen noise decreased after the ball scribing. After comparison and analysis 8mm is settled as the optimum scribing spacing. The effects of the domain refinement on high permeability grainoriented silicon steels were interpreted from the static domain observation and principles of domain refinement.

Key words: ball scribing, high permeability grainoriented silicon steel, iron loss, Barkhausen noise, coercive force, permeability