Claims
- 1. A method of making cold-rolled sheet for electrical purposes, said sheet having isotropic magnetic properties, said method comprising the steps of hot rolling at a temperature of from 820.degree. to 1080.degree.C a steel consisting essentially of up to 0.1% carbon, from 0.15% to 0.35% manganese, from 0.3% to 2.4% aluminium, up to 0.25% copper, up to 0.05% sulphur, up to 0.2% phosphorus, up to 2.0% silicon and the balance iron except for impurities, to bring at least 5% of the grains into a {100} <hkl> - orientation, cold-rolling said sheet with a reduction in cross section of from 50% to 85% and subsequently recrystallisation-annealing said sheet at a temperature of from 820.degree. to 1200.degree.C. for a time sufficient to yield a product having a grain length at least five times the sheet thickness.
- 2. A method as claimed in claim 1, further comprising the step of reeling said sheet at a temperature of less than 720.degree.C after said hot rolling.
- 3. A method as claimed in claim 1, further comprising the step of normalising said sheet after said hot rolling.
- 4. A method as claimed in claim 1, further comprising the step of decarburisation-normalising said sheet with said sheet possessing scale as a result of said hot rolling.
- 5. A method as claimed in claim 1, wherein said cold-rolling is carried out in two stages and further comprising the step of annealing said sheet for from 10 to 30 minutes at a temperature of from 550.degree. to 950.degree.C between said two stages.
- 6. A method as claimed in claim 1, wherein said cold-rolling is carried out in two stages, and further comprising the step of decarburisation-annealing said sheet between said two stages.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2226379 |
May 1972 |
DT |
|
Parent Case Info
This is a continuation of application Ser. No. 365,446 filed May 31, 1973 and now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1,094,975 |
Dec 1967 |
UK |
Continuations (1)
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Number |
Date |
Country |
Parent |
365446 |
May 1973 |
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