Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1975-09-16
1977-03-29
Satterfield, Walter R.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148 3155, 148112, H01F 104
Patent
active
040147177
ABSTRACT:
A process for the production of oriented-grain high magnetic permeability steel sheet including the steps of continuously casting a steel slab haing a weight % composition within the range of 2.5-3.5 Si, 0.01-0.04 S, less than 0.07 C, less than 0.15 Mn, and an acid-soluble aluminum in an amount between 0.01 and 0.05, at a feed rate ranging from 700 to 1000 kg/minute, into an ingot mold of a length over 1200 mm and cooling it in said ingot mold with a quantity of water ranging from 2.8 to 4 m.sup.3 per ton of steel; heating the slab so obtained to 1300.degree.-1400.degree. C and immediately thereafter hot-rolling it to a thickness in the range between 2 and 3.1 mm, annealing the strip so obtained at a temperature in the range between 1050.degree. and 1150.degree. C, keeping it at this temperature for a duration between 5 and 30 seconds; cooling it at any desired cooling rate to 750.degree.-850.degree. C at a temperature at which austenite is still present in it; keeping the strip at this temperature for a duration ranging from 30 to 200 seconds; and finally quenching it from the initial quenching temperature of 400.degree. C at a cooling rate of between 10.degree. C/second and 100.degree. C/second; cold-rolling the strip so obtained with a reduction rate ranging from 80 to 90% and subjecting it finally to the decarburization and recrystallization annealing operations as well as to other final anneals.
REFERENCES:
patent: 3636579 (1972-01-01), Sakakura et al.
patent: 3846187 (1974-11-01), Sakakura et al.
patent: 3872704 (1975-03-01), Ohya et al.
patent: 3876476 (1975-04-01), Matsuoka et al.
Barisoni Mario
Barteri Massimo
Bitti Roberto Ricci
Brozzo Pietro
Marianeschi Edmondo
Centro Sperimentale Metallurgico S.p.A.
Satterfield Walter R.
Terni Societa per l'Industria e l'Elettricita S.p.A.
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