US3990887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold working steel bar and wire rod produced by continuous casting
Assignee: Nippon Steel Corp
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Filing: 1974-10-29
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Granted: 1976-11-09
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Expires: 1994-10-29
Abstract
Abstract A method of producing steel bars and steel wire which can be cold worked is disclosed.
Inventors
- 👤 Kiyoaki Hisada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:24
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A method of producing steel bars and steel wire which can be cold worked, consisting essentially of: a. deoxidizing a steel furnace melt having a carbon content of between 0.01 to 0.25% with manganese, aluminum and silicon in amounts so as to obtain a melt consisting essentially of 0.01-0.25% of C 0.02-0.08% of Si 0.20-0.60% of Mn 0.002-0.015% of Al less than 0.009% of S and between 50-150 ppm of oxygen, with the balance being iron, b. casting the melt continuously and c. rolling the cast product into bars or wires.
Claim 2
Independent Claim
91 words
A method of producing steel bars and steel wire which can be cold worked, consisting essentially of: a. deoxidizing a steel furnace melt having a carbon content of between 0.01 to 0.25% with manganese, aluminum and silicon in amounts so as to obtain a melt consisting essentially of 0.01-0.25% of C 0.02-0.08% of Si 0.20-0.60% of Mn 0.002-0.015% of Al less than 0.009% of S and between 50-150 ppm of oxygen, with the balance being iron, b. casting the melt continuously and c. rolling the cast product into bars or wires.
Claim 3
Dependent Claim
26 words
A method as claimed in claim 1, wherein step (a) is carried out while the melt is tapped from the melt producing furnace into a ladle.
Claim 4
Dependent Claim
52 words
A method as claimed in claim 1, wherein said steel furnace melt has a carbon content of 0.03-0.20% and the amount of manganese, silicon and aluminum is such that the deoxidized melt composition consists essentially of C: 0.03-0.20% mn: 0.30-0.50% Si: 0.02-0.08% Al: 0.002-0.15% Oxygen: 80-120 ppm with the balance being iron.
Claim 5
Dependent Claim
20 words
A method as claimed in claim 1, wherein the amounts of manganese, silicon, and aluminum added satisfy the formula: ##EQU2##
Claim 6
Dependent Claim
12 words
A steel bar or wire produced by the method of claim 1.
Claim 7
Dependent Claim
12 words
A steel bar or wire produced by the method of claim 3.
References Cited (Backward Citations)
US3000731A
Cited
US3020153A
Cited
US3314782A
Cited
US3411957A
Cited
US3467167A
Cited
US3598658A
Cited
US3711277A
Cited
US3754895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |