Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1994-10-13
1995-12-05
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148112, H01F 1147
Patent
active
054725216
ABSTRACT:
This invention is directed to improve magnetic properties and to stabilize the magnetic properties of a grain oriented electrical steel sheet used as a core of electric appliances. When producing a grain oriented electrical steel sheet by heating a slab containing C, Si, acid-soluble Al, N, not more than 0.014% of S+0.405 Se and 0.05 to 0.8% of Mn and the balance consisting of Fe and unavoidable impurities at a temperature of less than 1,280.degree. C., effecting hot rolling, applying cold rolling, decarbonization annealing and final finish annealing without annealing hot rolled sheet, the production method of the present invention controls the precipitation quantity of AlN in the hot rolled sheet, controls the mean grain size of the primary crystallization grains from completion of decarbonization annealing to the start of final finish annealing, applies nitriding treatment after hot rolling but before the start of secondary recrystallization at final finish annealing, controls the hot rolling condition in accordance with the quantities of acid-soluble Al and N of the slab, and further adds Sn.
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Ishibashi Maremizu
Mishima Yoichi
Yamasaki Koji
Yoshitomi Yasunari
Nippon Steel Corporation
Sheehan John
LandOfFree
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