Direction for use : As the best magnetic property exist in Rolling direction, It is absolute necessary to constrain the magnetization in the whole magnetic circuit as exactly as possible in the rolling direction.

Stress : Mechanical stresses exert a significant effect on the magnetic properties of the grain oriented electrical steel. Such stresses can be introduced into the strip in many ways, like by external forces (external stresses), by plastic deformation (internal stresses ). External stresses may arise if the laminations in a magnetic core are pressed into a wavy or curved shape by excessive or uneven compression. Internal stresses are generated along the cut edges during each slitting operation and as a result of bending the sheet and subjecting it to the tension beyond the yield point

Stress Reliveing : By stress releif annealing it is possible to reduce these unavoidable stresses almost completely . This annealing can be done in a continious furnace under air (short annealing cycle ) or in a batch type furnace under nitrogen (batch annealing cycle )

Short term annealing cycle : For the annealing of laminations the short annealing cycle in a roller hearth or mesh belt furnace is advantageous. This cycle lasts only few minutes. the annealing time being 1-2 minutes between 800-860 deg. C in air atmosphere.

Long Term annealing cycle : The long term annealing cycle is recommended for wound or small stacked cores. It is performed continuously in a mesh-belt furnace or as batch annealing in a bell type furnace. For such an annealing cycle the following cycles are recommended.