US4863515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool steel
Assignee: UDDEHOLM TOOLING GEIJERSVAGEN S-683 05 HAGFORS SWEDEN AB
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Filing: 1987-12-16
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Granted: 1989-09-05
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Expires: 2007-12-16
Abstract
Abstract The invention relates to a tool steel intended for cold working operations and having very high impact strength and good resistance to wear, said steel being made powder-metallurgically by consolidation of metal powder to a dense body. The steel has the following chemical composition expessed in weight-% 1-2.5% C, 0.1-2% Si, max 0.3% N, 0.1-2% Mn, 6.5-11% Cr, max 4% Mo, max 1% W and 3-7% V, wherein up to half the amount of vanadium can be replaced by 1.5 times as much niobium, and wherein the ratio V/C shall amount to between 2.5 and 3.7, balance essentially only iron and impurities and accessory elements in normal amounts.
Inventors
- 👤 William Roberts
- 👤 Borje Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:56
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/36; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; C22C38/24
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A tool steel intended for cold working operations and having very high impact strength and good resistance to wear, said steel being made powder-metallurgically by consolidation of metal powder to a dense body, characterized in that it has the following chemical composition expressed in weight-% 1-2.5% C, 0.1-2% Si, max 0.3% N, 0.1-2% Mn, 6.5-11% Cr, max 4% Mo, max 1% W and 3-7% V, wherein up to half the amount of vanadium can be replaced by 1.5 times as much niobium, the maximum V/C ratio being 3.7, and the ratio V/Mo being at least 2.6, the balance being essentially only iron and impurities and accessory elements in normal amounts.
Claim 2
Dependent Claim
110 words
A tool steel intended for cold working operations and having very high impact strength and good resistance to wear, said steel being made powder-metallurgically by consolidation of metal powder to a dense body, characterized in that it has the following chemical composition expressed in weight-% 1-2.5% C, 0.1-2% Si, max 0.3% N, 0.1-2% Mn, 6.5-11% Cr, max 4% Mo, max 1% W and 3-7% V, wherein up to half the amount of vanadium can be replaced by 1.5 times as much niobium, the maximum V/C ratio being 3.7, and the ratio V/Mo being at least 2.6, the balance being essentially only iron and impurities and accessory elements in normal amounts.
Claim 3
Dependent Claim
14 words
A tool steel according to claim 1, characterised in that it contains 3-5% V.
Claim 4
Dependent Claim
14 words
A tool steel according to claim 2, characterised in that it contains 1-1.5% C.
Claim 5
Dependent Claim
14 words
A tool steel according to claim 2, characterised in that it contains 1.2-1.8% C.
Claim 6
Dependent Claim
19 words
A tool steel according to claim 4, characterised in that it contains about 4% V and about 1.5% C.
Claim 7
Dependent Claim
13 words
A tool steel according to claim 4, characterised in that the ratio V/C=2.8-3.7.
Claim 8
Dependent Claim
13 words
A tool steel according to claim 6, characterised in that the ratio V/C=3.0-3.5.
Claim 9
Dependent Claim
14 words
A tool steel according to claim 1, characterised in that it contains 5-7% V.
Claim 10
Dependent Claim
14 words
A tool steel according to claim 8, characterised in that it contains 1.5-2.3% C.
Claim 11
Dependent Claim
22 words
A tool steel according to any one of claims 2-9 or 1, characterised in that it contains 7-10% Cr and 0.5-3% Mo.
Claim 12
Dependent Claim
14 words
A tool steel according to claim 10, characterised in that it contains 1-2% Mo.
Claim 13
Dependent Claim
21 words
A tool steel according to claim 11, characterised in that it does not contain more than incidental impurity contents of W.
Claim 14
Dependent Claim
14 words
A tool steel according to claim 12, characterised in that it contains 0.2-0.9% Mn.
Claim 15
Dependent Claim
14 words
A tool steel according to claim 13, characterised in that it contains 0.5-1.5% Si.
Claim 16
Dependent Claim
33 words
A tool steel according to claim 14, characterised in that the total carbon content, where the main part of the carbides consists of carbides of MC-type, amounts to between 5 and 20 volume-%.
Claim 17
Dependent Claim
19 words
A tool steel according to claim 1, wherein the V/Mo ratio is in the range of 2.6 to 6.9.
Claim 18
Dependent Claim
21 words
A tool steel according to claim 15 wherein said carbides are present in amounts of between 5 and 12 volume %.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |