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Abstract
Addition of tin in 3% Si steel is a method to improve magnetic properties since tin in steel is known as an element that segregates at grain boundaries, inhibits grain growth and has a dragging effect on grain boundary movement. However, tin is generally known as an element that has a harmful effect on surface coating properties. The oxide subscale formed on the decarburization annealing of a 3% Si steel containing tin was investigated by SEM, EDS, GDS and FTIR. The forsterite film was evaluated by SEM, EDS and GDS. The higher tin content decreased thickness, oxygen and fayalite/silica ratio in the subscale and resulted into a discontinuous forsterite film with poor oxidation resistance. After secondary coating the samples presented a reddish color due to the formation of iron oxide and poor dielectric property.
Highlights
The high permeability grain oriented silicon steel is widely used in transformers cores
Its excellent magnetic properties in the rolling direction results from a high degree of Goss texture (110)[001] obtained by secondary recrystallization, from a matrix of small grains and adequate texture stabilized by a dispersion of second phase. This material is produced by using AlN as grain growth inhibitor and small amounts of alloying elements like tin that acts as a supplemental inhibitor by means of grain boundary segregation and improves magnetic properties.[1,2]
High permeability grain oriented silicon steel has a primary insulation coating composed mainly of forsterite, formed by a solid-state reaction of the annealing separator MgO with silica and fayalite from the oxide subscale previously formed on the strip
Summary
The high permeability grain oriented silicon steel is widely used in transformers cores. Its excellent magnetic properties in the rolling direction results from a high degree of Goss texture (110)[001] obtained by secondary recrystallization, from a matrix of small grains and adequate texture stabilized by a dispersion of second phase. This material is produced by using AlN as grain growth inhibitor (acquired inhibitor) and small amounts of alloying elements like tin that acts as a supplemental inhibitor by means of grain boundary segregation and improves magnetic properties.[1,2]. Tin concentrates at the surface during decarburization and retards subscale formation.[2,3]
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