C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/8
C21D 8/12 (2006.01) C21D 1/70 (2006.01) C23C 10/28 (2006.01) H01F 1/147 (2006.01)
Patent
CA 1194386
ABSTRACT OF THE DISCLOSURE An improvement in the manufacture of cube-on-edge oriented silicon steel; the improvement comprises coating the surface of the silicon steel with a manganese-bearing material prior to texture annealing, whereby secondary grain growth is inhibited during texture annealing to achieve reduced watt loss. Cube-on-edge oriented silicon steel in the form of sheets is known for use in various electrical applications including transformer cores. With cube on-edge silicon steel the alloy is characterized by secondary recrystallization in the (110)[001] position, which is termed the cube-on-edge position. This material in sheet form has the direction of easy magnetization in the direction of rolling. In applications for this materiel, and specifically when used in the manufacture of transformer cores, the material is required to have reduced watt loss, because the consumption of electrical energy decreases as iron loss decreases. Reduced watt loss may be promoted by achieving fine secondary grain size during texture annealing. It is accordingly an object of the present invention to provide a method whereby during the texture annealing of cube-on- edge silicon steel the secondary grain growth is inhibited to provide a relatively fine grained material after texture annealing with reduced watt loss. This and other objects of the invention, as well as a more complete understanding thereof, may be obtained from the following description and specific examples. Broadly, in the practice of the invention a silicon steel which has been conventionally processed by hot rolling and
422372
Allegheny Ludlum Corporation
Riches Mckenzie & Herbert Llp
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