US3932234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing single-oriented electrical steel sheets comprising antimony and having a high magnetic induction
Assignee: JFE Steel Corp
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Filing: 1973-10-09
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Granted: 1976-01-13
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Expires: 1993-10-09
Abstract
Abstract Single-oriented electrical steel sheets having a high magnetic induction can be produced by hot rolling a silicon steel raw material containing less than 0.06% of C and less than 4% of Si, subjecting to annealing step and cold rolling step conveniently repeatedly to form a cold rolled steel sheet having a final gauge and subjecting to a decarburization annealing and a final annealing to develop secondary recrystallized grains having (110)[001] orientation, said silicon steel raw material being characterized in containing 0.005-0.200% of Sb and less than 0.10% of at least one of Se and S. Said final annealing for secondary recrystallization at a temperature of 800°-920°C gives a preferable result.
Inventors
- 👤 Takuichi Imanaka
- 👤 Takahiro Kan
- 👤 Yoshio Obata
- 👤 Toru Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:35
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; C21; C21D; C21D8/00; C21D8/12; C21D8/1244; C21D8/1272; C21D8/1216; C21D8/1233
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
A method of manufacturing single-oriented electrical steel sheet comprising: a. hot rolling a silicon steel raw material consisting essentially of less than 0.06% of carbon, less than 4% of silicon, 0.012 to 0.045% of antimony aand 0.008 to 0.10% of at least one member of a group selected from selenium, sulphur and tellurium, and 0.02 to 0.2% of manganese, to an intermediate gauge of about 2-5mm; b. effecting at least one cold rolling at a reduction rate of 40-85% so as to form a cold rolled steel sheet having final gauge; c. decarburization annealing said sheet in a wet hydrogen atmosphere at 750°-850°C to minimize the amount of carbon in said sheet subsequently; d. subjecting the sheet to a secondary recrystallization annealing at a temperature of 800°-920°C for 10 to 120 hours selected so as to grow the crystal grains having (110) (001) orientation; and thereafter; e. subjecting the sheet to a purification annealing at a temperature greater than 1,000°C and fluctuating in direct proportion to the silicon content so as to remove S and Se, whereby the iron loss of the final product is decreased.
Claim 2
Independent Claim
186 words
A method of manufacturing single-oriented electrical steel sheet comprising: a. hot rolling a silicon steel raw material consisting essentially of less than 0.06% of carbon, less than 4% of silicon, 0.012 to 0.045% of antimony aand 0.008 to 0.10% of at least one member of a group selected from selenium, sulphur and tellurium, and 0.02 to 0.2% of manganese, to an intermediate gauge of about 2-5mm; b. effecting at least one cold rolling at a reduction rate of 40-85% so as to form a cold rolled steel sheet having final gauge; c. decarburization annealing said sheet in a wet hydrogen atmosphere at 750°-850°C to minimize the amount of carbon in said sheet subsequently; d. subjecting the sheet to a secondary recrystallization annealing at a temperature of 800°-920°C for 10 to 120 hours selected so as to grow the crystal grains having (110) (001) orientation; and thereafter; e. subjecting the sheet to a purification annealing at a temperature greater than 1,000°C and fluctuating in direct proportion to the silicon content so as to remove S and Se, whereby the iron loss of the final product is decreased.
Claim 3
Independent Claim
186 words
A method of manufacturing single-oriented electrical steel sheet comprising: a. hot rolling a silicon steel raw material consisting essentially of less than 0.06% of carbon, less than 4% of silicon, 0.005 to 0.2% of antimony and 0.008 to 0.10% of at least one member of a group selected from selenium, sulphur and tellurium, and 0.02 to 0.2% of manganese, to an intermediate gauge of about 2-5mm; b. effecting at least one cold rolling at a reduction rate of 40 to 85% so as to form a cold rolled steel sheet having its final gauge; c. decarburization annealing of 750°-850° said sheet in a wet hydrogen atmosphere to minimize the carbon subsequently; d. subjecting the sheet to a secondary recrystallization annealing at a temperature of 800° to 920°C for 10 to 120 hours selected so as to grow the crystal grains having (110) (001) orientation; and thereafter; e. subjecting the sheet to a purification annealing at a temperature greater than 1,000°C and fluctuating in direct proportion to the silicon content so as to remove S and Se, whereby the iron loss of the final product is decreased.
Claim 4
Independent Claim
186 words
A method of manufacturing single-oriented electrical steel sheet comprising: a. hot rolling a silicon steel raw material consisting essentially of less than 0.06% of carbon, less than 4% of silicon, 0.005 to 0.2% of antimony and 0.008 to 0.10% of at least one member of a group selected from selenium, sulphur and tellurium, and 0.02 to 0.2% of manganese, to an intermediate gauge of about 2-5mm; b. effecting at least one cold rolling at a reduction rate of 40 to 85% so as to form a cold rolled steel sheet having its final gauge; c. decarburization annealing of 750°-850° said sheet in a wet hydrogen atmosphere to minimize the carbon subsequently; d. subjecting the sheet to a secondary recrystallization annealing at a temperature of 800° to 920°C for 10 to 120 hours selected so as to grow the crystal grains having (110) (001) orientation; and thereafter; e. subjecting the sheet to a purification annealing at a temperature greater than 1,000°C and fluctuating in direct proportion to the silicon content so as to remove S and Se, whereby the iron loss of the final product is decreased.
Claim 5
Dependent Claim
49 words
A method of manufacturing single-oriented steel sheet as defined in claim 2, wherein in the case of effecting two or more cold rolling steps, annealing at a temperature of 850°-1,100°C corresponding to the number of times of the repeated cold rolling steps is effected between the cold rolling steps.
Claim 6
Dependent Claim
23 words
A method of manufacturing single-oriented electrical steel sheet as defined in claim 2, wherein the final cold rolling rate is 50 to 77%.
Claim 7
Dependent Claim
29 words
A method of manufacturing single-oriented electrical steel sheet as defined in claim 2, wherein the final annealing for secondary recrystallization is effected at a temperature of 800° to 880°C.
Claim 8
Dependent Claim
38 words
A method of manufacturing single-oriented electrical steel sheet as defined in claim 2, wherein said silicon steel raw material additionally contains a positive amount of less than 0.5% of Cr, Nb, V, W, B, Ti, Zr or Ta.
Claim 9
Dependent Claim
42 words
A method of manufacturing single-oriented steel sheet as defined in claim 2, wherein the silicon steel raw material is subjected to an annealing at a temperature of 850°-1,100°C to produce a homogeneous texture in the hot rolled material prior to cold rolling.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |