US4046600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing large diameter steel rods
Assignee: Kobe Steel Ltd
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Filing: 1974-12-17
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Granted: 1977-09-06
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Expires: 1994-12-17
Abstract
Abstract A large gauge high strength steel rod having a diameter of not less than 9 mm, is produced from high carbon steel containing, by weight percent, from 0.65 to 0.90% carbon and from 0.15 to 1.5% chromium capable of being drawn without subsequent heat treatment.
Inventors
- 👤 Noboru Yamakoshi
- 👤 Tsugio Kaneda
- 👤 Nobuyasu Hatsuoka
- 👤 Shinichi Shimazu
- 👤 Tatsu Fujita
- 👤 Yoshiro Yamada
- 👤 Tetsuo Yamada
- 👤 Atsuo Mizuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:43
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C21; C21D; C21D8/00; C21D8/06; C21D9/00; C21D9/52; C21D9/525
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A method for producing a large gauge, high strength steel rod having a diameter of not less than 9 mm, which comprises subjecting a high carbon steel rod billet consisting essentially of from 0.65 to 0.9% C, from 0.15 to 1.5% chromium, less than 2.0% silicon, less than 1.5 manganese, at least one element from the group consisting of aluminum, niobium, vanadium zirconium and titanium in an amount of less than 0.3% in total, balance essentially iron, to hot rolling immediately followed by a controlled cooling treatment, by the use of an air cooling medium, so as to effect a phase transformation to obtain a structure consisting essentially of fine pearlite, whereby a steel rod having a tensile strength of above 115 kg/mm 2 is produced without any re-heating treatment, wherein the resulting steel rod has the mechanical properties such that it may subjected to a reduction in area is excess of 35% without requiring heat treatment.
Claim 2
Independent Claim
157 words
A method for producing a large gauge, high strength steel rod having a diameter of not less than 9 mm, which comprises subjecting a high carbon steel rod billet consisting essentially of from 0.65 to 0.9% C, from 0.15 to 1.5% chromium, less than 2.0% silicon, less than 1.5 manganese, at least one element from the group consisting of aluminum, niobium, vanadium zirconium and titanium in an amount of less than 0.3% in total, balance essentially iron, to hot rolling immediately followed by a controlled cooling treatment, by the use of an air cooling medium, so as to effect a phase transformation to obtain a structure consisting essentially of fine pearlite, whereby a steel rod having a tensile strength of above 115 kg/mm 2 is produced without any re-heating treatment, wherein the resulting steel rod has the mechanical properties such that it may subjected to a reduction in area is excess of 35% without requiring heat treatment.
References Cited (Backward Citations)
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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 |