Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1993-11-22
1995-06-06
Andrews, Melvyn J.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148113, H01F 104
Patent
active
054219116
ABSTRACT:
The present invention provides a steel composition and method for producing a high quality regular grain oriented electrical steel having less than 0.005% aluminum using a single cold reduction step. A high austenite volume fraction, the use of an annealing separator coating with high sulfur or a sulfur bearing atmosphere to provide strong surface energy grain growth, a quench after initial annealing to provide the optimum microstructure having a small amount of martensite with a fine carbide dispersion and various chemistry changes are included in the method. Excess manganese in combination with tin, which has been found to act similarly to excess Mn, are maintained at a total level less than 0.03%. The use of chromium in an amount ranging from 0.11% to 1.2% provides outstanding control of stability for secondary grain growth. The finished regular grain oriented electrical steel has superior and more uniform magnetic quality than available from previous single stage processes and the magnetic quality is comparable to regular grain oriented electrical steels made using processes requiring two stages of cold reduction separated by an annealing step. The present invention also permits the production of thinner gauges while still using a single stage of cold reduction.
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"Developments of Grain Oriented Si Steel Sheets with Low Iron Loss", Sadyori et al, Kawasaki Seitetsu Giho, vol. 21, No. 3, pp. 93-98, 1989.
Andrews Melvyn J.
Armco Inc.
Bunyard Robert J.
Fillnow Larry A.
Ip Sikyin
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