Process of aluminization of sheets of magnetic steel with oriented grains
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United States of America Patent
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Jun 23, 1992
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N/A
app pub date -
Jan 28, 1991
filing date -
Feb 6, 1990
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Expired
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Abstract
A process of aluminizing magnetic steel sheets is disclosed. The process involves annealing a steel sheet in order to achieve partial secondary recrystallization, providing aluminum on the steel sheet, preferably by vacuum evaporation or immersion, and subjecting the steel sheet to a further heat treating step in order to diffuse the aluminum into the sheet and decrease impurities therein. Preferably, the partial secondary recrystallization anneal is performed in a neutral atmosphere such as nitrogen, while the final heat treating step is performed in a hydrogen atmosphere, and at a higher temperature than the above annealing step.
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