Grain oriented electrical steel having high volume resistivity a

Details Grain oriented electrical steel having high volume resistivity a Grain oriented electrical steel having high volume resistivity a

1995-05-16

1997-07-01

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148113, H01F 1147

Patent

active

056433700

ABSTRACT:
The present invention relates to the production of a grain oriented electrical steel composition having a volume resistivity of at least 50 micro-ohm-cm. The melt composition of the steel consists essentially of, in weight %, about 0.08% max carbon, about 0.015 to about 0.05% aluminum, 2.25 to 7% silicon, greater than about 0.5% manganese.sub.eq, about 0.001 to about 0.011% nitrogen, about 0.01% max sulfur, about 3% max chromium, about 1% max copper, about 2% max nickel and balance essentially iron. High levels of silicon are balanced with a manganese equivalent relationship which permits lower levels of carbon while still providing the desired levels of austenite during rolling and annealing. The processing also includes the addition of excess nitrogen to the steel prior to secondary grain growth which is subsequently removed during a purification treatment.

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Kawasaki Seitetsu Giho, vol. 21, No. 3, pp. 93 to 98, 1989, "Developments of Grain Oriented Si-Steel Sheets With low Iron Loss"1989.

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