Electro magnetic steels
AssigneeBritish Steel Corporation
InventorsAlan Coombs, James H. R. Page
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Abstract
A method for producing non-oriented steel for electromagnetic applications comprises hot rolling a steel containing a nitride/carbide former and coiling the hot band at a temperature of not less than 680.degree. C. before cold reduction and annealing in a non-decarburizing atmosphere.
Claims15
A method for producing non-oriented steel sheet for electromagnetic applications which comprises hot rolling steel having less than 0.025% carbon, between 0.05% and 3.5% silicon, between 0.2% and 0.8% manganese, between 0.10% and 0.35% aluminium, between 0.003% and 0.008% nitrogen, together with a nitride/carbide former selected from the group consisting of titanium, niobium, tantalum, vanadium, and zirconium, the remainder being iron except for incidental impurities, coiling the hot band at a temperature of not less than 680.degree. C. subsequently cold reducing the band and then subjecting the cold reduced material of substantially final gauge to a non-decarburising anneal at a temperature lying within the range 900.degree. C. to 1000.degree. C. whereby a structure having a large primary grain size essentially randomly oriented is developed.
Dependencies are inferred from the claim text.