US4019930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep hardening machinable aluminum killed high sulfur tool steel
Assignee: Bethlehem Steel Corp
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Filing: 1975-11-19
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Granted: 1977-04-26
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Expires: 1995-11-19
Abstract
Abstract A low-alloy tool steel, for dies and molds, is deep hardening and highly machinable in the hardened condition. The steel is a water-quenched composition containing boron, sulfur, at least 0.020% aluminum, and a minimum of hardening agents including chromium and molybdenum. The method of producing such steel is disclosed.
Inventors
- 👤 Paul T. Aylward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:05
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
64 words
A low alloy, aluminum killed, water quenched, resulfurized, martensitic, deep hardening steel, highly machinable in the hardened condition consisting essentially of by weight percent: ______________________________________
Carbon .33 to .42%
Manganese .70 to 1.25%
Phosphorus .025% maximum
Sulfur .03 to .110%
Silicon .15 to .45%
Aluminum .019% to .077%
Chromium .90 to 1.85%
Molybdenum .10 to .50%
______________________________________ and the balance iron with residual impurities.
Claim 2
Dependent Claim
64 words
A low alloy, aluminum killed, water quenched, resulfurized, martensitic, deep hardening steel, highly machinable in the hardened condition consisting essentially of by weight percent: ______________________________________
Carbon .33 to .42%
Manganese .70 to 1.25%
Phosphorus .025% maximum
Sulfur .03 to .110%
Silicon .15 to .45%
Aluminum .019% to .077%
Chromium .90 to 1.85%
Molybdenum .10 to .50%
______________________________________ and the balance iron with residual impurities.
Claim 3
Dependent Claim
35 words
The steel of claim 1 containing additionally boron and titanium in amounts to effect hardening of said steel, said boron and titanium being present in amounts of at least 0.0005 and 0.010 weight percent respectively.
Claim 4
Dependent Claim
43 words
The steel of claim 2 in which the machinability as measured by cubic inches of metal removed for the life of a tool is between about 5.0 and 12.6 when the steel is tempered to a hardness of about 285 to 311 Brinell.
References Cited (Backward Citations)
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US3600158A
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US3544393A
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US3901740A
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US3876422A
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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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |