US3974555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolls for rolling mills and method for making same
Assignee: Schwarzkopf Technologies Corp
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Filing: 1975-05-16
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Granted: 1976-08-17
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Expires: 1995-05-16
Abstract
Abstract Disclosed are improved rolls for use in elevated temperature rolling operations and a method for making said rolls. At least a portion of said rolls comprises a coated surface, said coating comprising carbides, carbonitrides, nitrides, borides or oxides of at least one member of the group consisting of the Group III to Group VI elements of the Periodic Table.
Inventors
- 👤 Gerolf Strohmeier
- 👤 Johann Bodem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:41
CPC Classifications
B; B21; B21B; B21B27/00; C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/36; B21B27/02; B21B27/03
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
44 words
An improved roll for hot rolling at elevated temperatures, said roll comprising a hard coating, said coating comprising at least one member of the group consisting of carbides, carbonitrides, nitrides, borides and oxides of Group III to Group VI elements of the Periodic Table.
Claim 2
Dependent Claim
44 words
An improved roll for hot rolling at elevated temperatures, said roll comprising a hard coating, said coating comprising at least one member of the group consisting of carbides, carbonitrides, nitrides, borides and oxides of Group III to Group VI elements of the Periodic Table.
Claim 3
Dependent Claim
19 words
A roll according to claim 1, wherein said coating is from about 1 to about 50 μ in thickness.
Claim 4
Dependent Claim
29 words
A roll according to claim 2, wherein said coating comprises a carbon-rich layer at the surface of said roll and a nitride-rich layer at the surface of said coating.
Claim 5
Dependent Claim
23 words
A roll according to claim 3, wherein said coating comprises a continuous transition in composition from said carbon-rich layer to said nitride-rich layer.
Claim 6
Dependent Claim
24 words
A roll according to claim 4, wherein said coating comprises from 0 to about 20 weight percent of at least one soft binder metal.
Claim 7
Dependent Claim
22 words
A roll according to claim 5, wherein said soft binder metal is selected from the group consisting of iron, cobalt and nickel.
Claim 8
Dependent Claim
19 words
A roll according to claim 4, wherein the surface of said coating consists essentially of at least one nitride.
Claim 9
Dependent Claim
19 words
A roll according to claim 7, wherein said coating is from about 5 to about 15 μ in thickness.
Claim 10
Dependent Claim
24 words
An improved roll for hot rolling at elevated temperatures, said roll comprising a hard coating, said coating comprising carbides, carbonitrides and nitrides of titanium.
Claim 11
Dependent Claim
24 words
An improved roll for hot rolling at elevated temperatures, said roll comprising a hard coating, said coating comprising carbides, carbonitrides and nitrides of titanium.
Claim 12
Dependent Claim
17 words
A roll according to claim 9, wherein said roll, prior to coating, comprises a cemented carbide surface.
Claim 13
Dependent Claim
30 words
A roll according to claim 9, wherein said coating comprises a carbon-rich layer at the surface of said roll and a titanium nitride-rich layer at the surface of said coating.
Claim 14
Dependent Claim
30 words
A roll according to claim 11, wherein said coating comprises a continuous transition in composition from said carbon-rich layer to said titanium nitride-rich layer, said continuous transition comprising titanium carbonitride.
Claim 15
Dependent Claim
17 words
A roll according to claim 12, wherein the surface of said coating consists essentially of titanium nitride.
Claim 16
Dependent Claim
24 words
A roll according to claim 12, wherein said coating comprises from 0 to about 20 weight percent of at least one soft binder metal.
Claim 17
Dependent Claim
22 words
A roll according to claim 14, wherein said soft binder metal is selected from the group consisting of iron, cobalt and nickel.
Claim 18
Dependent Claim
19 words
A roll according to claim 12, wherein said coating is from about 1 to about 50 μ in thickness.
Claim 19
Dependent Claim
19 words
A roll according to claim 16, wherein said coating is from about 5 to about 15 μ in thickness.
Claim 20
Dependent Claim
67 words
An improved roll for hot rolling at elevated temperatures, said roll comprising a cemented carbide surface having a coating thereon, said coating comprising: a. a carbon-rich layer at the surface of said roll; b. a titanium nitride-rich layer at the surface of said coating; and c. a continuous transition in composition from said roll surface layer to said coating surface layer, said continuous transition comprising titanium carbonitride.
Claim 21
Dependent Claim
67 words
An improved roll for hot rolling at elevated temperatures, said roll comprising a cemented carbide surface having a coating thereon, said coating comprising: a. a carbon-rich layer at the surface of said roll; b. a titanium nitride-rich layer at the surface of said coating; and c. a continuous transition in composition from said roll surface layer to said coating surface layer, said continuous transition comprising titanium carbonitride.
Claim 22
Dependent Claim
22 words
A roll according to claim 18, wherein said coating comprises from 0 to about 20 weight percent of a soft binder metal.
Claim 23
Dependent Claim
22 words
A roll according to claim 19, wherein said soft binder metal is selected from the group consisting of iron, cobalt and nickel.
Claim 24
Dependent Claim
19 words
A roll according to claim 18, wherein said coating is from about 1 to about 50 μ in thickness.
Claim 25
Dependent Claim
19 words
A roll according to claim 21, wherein said coating is from about 5 to about 15 μ in thickness.
Claim 26
Independent Claim
82 words
A method for making improved rolls comprising a coating, said method comprising the steps: a. forming a carbon-rich layer on the surface of a roll; and b. forming a continuous transition layer from said carbon-rich layer to the coating surface, said transition layer comprising a carbide-rich inner layer and a nitride-rich outer layer, said transition layer comprising carbides, carbonitrides and nitrides of at least one member of the group consisting of the Group III to Group VI elements of the Periodic Table.
Claim 27
Independent Claim
82 words
A method for making improved rolls comprising a coating, said method comprising the steps: a. forming a carbon-rich layer on the surface of a roll; and b. forming a continuous transition layer from said carbon-rich layer to the coating surface, said transition layer comprising a carbide-rich inner layer and a nitride-rich outer layer, said transition layer comprising carbides, carbonitrides and nitrides of at least one member of the group consisting of the Group III to Group VI elements of the Periodic Table.
Claim 28
Dependent Claim
17 words
A method according to claim 23, wherein the surface of said coating consists essentially of said nitride.
Claim 29
Independent Claim
67 words
A method for making improved rolls comprising a coating, said method comprising the steps: a. forming a carbon-rich layer on the surface of a cemented carbide roll; and b. forming a continuous transition layer from said carbon-rich layer to the coating surface, said transition layer comprising a titanium carbide-rich inner layer and a titanium nitride-rich outer layer, said transition layer comprising carbides, carbonitrides and nitrides of titanium.
Claim 30
Independent Claim
67 words
A method for making improved rolls comprising a coating, said method comprising the steps: a. forming a carbon-rich layer on the surface of a cemented carbide roll; and b. forming a continuous transition layer from said carbon-rich layer to the coating surface, said transition layer comprising a titanium carbide-rich inner layer and a titanium nitride-rich outer layer, said transition layer comprising carbides, carbonitrides and nitrides of titanium.
Claim 31
Dependent Claim
17 words
A method according to claim 25, wherein the surface of said coating consists essentially of titanium nitride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |