US3652267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon steels and alloy steels for cold forging
Assignee: Daido Steel Co Ltd
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Filing: 1968-09-23
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Granted: 1972-03-28
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Expires: 1988-09-23
Abstract
Abstract This invention relates to machine structural carbon steels and alloy steels having an excellent cold forging property. Such a steel can be produced by deoxidizing a carbon steel or an alloy steel with a calcium-silicon alloy and controlling the calcium content thereof.
Inventors
- 👤 Tetsuro Ito
- 👤 Azuma Hiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:45
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A cold forgeable carbon steel, characterizEd in that a steel consisting essentially of 0.18 to 0.23 percent of carbon, 0.15 of 0.35 percent of silicon, 0.30 to 0.60 percent of manganese and the balance substantially iron and incidental impurities is deoxidized with a calcium-silicon alloy and controlled so as to contain calcium in an amount varying from 0.0015 to 0.0060 percent.
Claim 2
Dependent Claim
61 words
A cold forgeable carbon steel, characterized in that a steel consisting essentially of 0.27 to 0.33 percent of carbon, 0.15 to 0.35 percent of silicon, 0.60 to 90 percent of manganese and the balance substantially iron and incidental impurities is deoxidized with a calcium-silicon alloy and controlled so as to contain calcium in an amount varying from 0.0015 to 0.0060 percent.
Claim 3
Dependent Claim
59 words
A cold forgeable carbon steel, characterized in that a steel containing 0.42 to 0.48 percent of carbon, 0.15 to 0.35 percent of silicon, 0.60 to 0.90 percent of manganese and the balance substantially iron and incidental impurities is deoxidized with a calcium-silicon alloy and controlled so as to contain calcium in an amount varying from 0.0015 to 0.0060 percent.
Claim 4
Dependent Claim
61 words
A cold forgeable carbon steel, characterized in that a steel consisting essentially of 0.52 to 0.58 percent of carbon, 0.15 to 0.35 percent of silicon, 0.60 to 0.90 percent of manganese and the balance substantially iron and incidental impurities is deoxidized with a calcium-silicon alloy and controlled so as to contain calcium in an amount varying from 0.0015 to 0.0060 percent.
Claim 5
Dependent Claim
74 words
A cold forgeable Cr-Mo base steel, characterized in that a steel consisting essentially of 0.33 to 0.38 percent of carbon, 0.15 to 0.35 percent of silicon, 0.60 to 0.85 percent of manganese, 0.90 to 1.20 percent of chromium, 0.15 to 0.30 percent of molybdenum and the balance substantially iron and incidental impurities is deoxidized with a calcium-silicon alloy and controlled so as to contain calcium in an amount varying from 0.0015 to 0.0060 percent.
References Cited (Backward Citations)
US2258604A
Cited
US3000731A
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US3215525A
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US3212881A
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US3275433A
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US3309194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |