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US4046598A
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US
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Procedure for manufacture of steel band or strip
Assignee: Uddeholms AB
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Filing: 1976-01-22
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Granted: 1977-09-06
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Expires: 1996-01-22
Abstract
Abstract A process for manufacture of a steel band or steel strip, the steel comprising spheroidal carbide particles in a ferritic base, wherein a steel, the major part of which is a carbonaceous ferritic austenite conversion product which is, structurally, at least one of lamellar perlite, granular perlite, sorbite, bainite and martensite, and which is at a temperature below the steel A cl -temperature is heated to a temperature which is above the A cl -temperature and within the ferrite metastability range, the steel is then rolled at a temperature in the said metastable temperature range, and the steel is then cooled to below the A cl -temperature, the heating, rolling and cooling taking place in a time short enough to ensure that no substantial conversion to austenite occurs in the steel.
Inventors
- 👤 Bo Lennart Janzon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:16
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/0221; C21D8/0226; C21D1/00; C21D1/26; C21D1/32; C21D8/0231
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A process for the manufacture of a band or strip of a steel comprising spheroidal carbide particles in a ferritic base which comprises heating a steel, the major part of which is, structurally, at least one carbonaceous ferritic austenite conversion product selected from the group consisting of lamellar perlite, granular perlite, sorbite, bainite and martensite, to a temperature which is above the A cl -temperature for that steel and within the ferritie metastability range for that steel, rolling the steel at a temperature in the said metastable temperature range, and then cooling the steel to below the A cl -temperature, the heating, rolling and cooling taking place in a time short enough to ensure that no substantial conversion to austenite occurs in the steel.
Claim 2
Dependent Claim
124 words
A process for the manufacture of a band or strip of a steel comprising spheroidal carbide particles in a ferritic base which comprises heating a steel, the major part of which is, structurally, at least one carbonaceous ferritic austenite conversion product selected from the group consisting of lamellar perlite, granular perlite, sorbite, bainite and martensite, to a temperature which is above the A cl -temperature for that steel and within the ferritie metastability range for that steel, rolling the steel at a temperature in the said metastable temperature range, and then cooling the steel to below the A cl -temperature, the heating, rolling and cooling taking place in a time short enough to ensure that no substantial conversion to austenite occurs in the steel.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein the steel is rolled at a temperature 10° to 50° C above the A cl -temperature.
Claim 4
Dependent Claim
23 words
A process according to claim 1, wherein the total time the steel remains above the A cl -temperature does not exceed 20 seconds.
Claim 5
Dependent Claim
15 words
A process according to claim 3, wherein the total time does not exceed 10 seconds.
Claim 6
Dependent Claim
27 words
A process according to claim 1, wherein the steel which is heated and rolled is in the form of a band of initial thickness of 0.5-10 mm.
Claim 7
Dependent Claim
12 words
A process according to claim 5, wherein the thickness is 1-5 mm.
References Cited (Backward Citations)
US3660174A
Cited
US3755004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |