Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1997-02-28
1997-12-30
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148112, 148113, H01F 104
Patent
active
057025398
ABSTRACT:
The present invention provides a method of producing grain oriented electrical steel having excellent mechanical and magnetic properties. A hot processed strip having a thickness of 1.5-4.0 mm thickness a composition consisting essentially of 2.5-4.5% silicon, 0.1-1.2% chromium, less than 0.050% carbon, less than 0.005% aluminum, up to 0.1% sulfur, up to 0.14% selenium, 0.01-1% manganese and balance being essentially iron and residual elements, all percentages by weight. The strip has a volume resistivity of at least 45 .mu..OMEGA.-cm, at least 0.010% carbon so that an austenite volume fraction (.gamma..sub.1150.degree. C.) of at least 2.5% is present in the hot processed strip and each surface of the strip has an isomorphic layer having a thickness of at least 10% of the total thickness of the hot processed strip. The strip is cold reduced to an intermediate thickness, annealed, cold reduced to a final thickness and decarburized to less than 0.003% carbon. The decarburized strip then is coated on at least one surface with an annealing separator and final annealed to effect secondary grain growth. The electrical steel has a permeability measured at 796 A/m of at least 1780.
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patent: 3947296 (1976-03-01), Kumazawa
patent: 5061326 (1991-10-01), Schoen
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patent: 5421911 (1995-06-01), Schoen
Dahlstrom Norris A.
Klapheke Christopher G.
Schoen Jerry W.
Armco Inc.
Bunyard R. J.
Fillnow L. A.
Sheehan John
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