US4436791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cast cold rolling roll
Assignee: USINOR SA
•
Filing: 1981-10-29
•
Granted: 1984-03-13
•
Expires: 2001-10-29
Abstract
Abstract The composite bimetallic roll for cold rolling obtained by casting comprises a heart metal constituted by a nodular or lamellar cast iron and a case metal constituted by a steel having a chromium content of 8 to 16% and a carbon content of 0.65 to 0.95%. The chromium/carbon ratio is between 11 and 16 and the structure of the case metal is martensitic with a content of residual austenite of less than 10%.
Inventors
- 👤 Jacques Bocquet
- 👤 Jean C. Werquin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:13
CPC Classifications
B; B21; B21B; B21B27/00; C; C21; C21D; C21D9/00; C21D9/38; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12972; Y10T428/12979
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A cast bimetallic composite roll for cold rolling, comprising in combination a heart metal constituted by a nodular or lamellar cast iron and a case metal constituted by a steel having a chromium content of 8 to 16% and a carbon content of 0.65 to 0.95%, the ratio between the chromium and carbon being between 11 and 16 and the structure of the case metal being martensitic with a residual austenite content of less than 10% and a hardness exceeding 700 HV.
Claim 2
Dependent Claim
82 words
A cast bimetallic composite roll for cold rolling, comprising in combination a heart metal constituted by a nodular or lamellar cast iron and a case metal constituted by a steel having a chromium content of 8 to 16% and a carbon content of 0.65 to 0.95%, the ratio between the chromium and carbon being between 11 and 16 and the structure of the case metal being martensitic with a residual austenite content of less than 10% and a hardness exceeding 700 HV.
Claim 3
Dependent Claim
19 words
A roll according to claim 1, wherein the case metal has a thickness of substantially 30 to 70 mm.
Claim 4
Dependent Claim
34 words
A roll according to claim 1 or 2, wherein the case metal has the following composition: ______________________________________
C Si Mn Cr Ni Mo V
______________________________________
%
##STR12##
##STR13##
##STR14##
##STR15##
##STR16##
##STR17##
##STR18##
______________________________________
Claim 5
Dependent Claim
35 words
A roll according to claim 1 or 2, wherein the heart metal is a nodular cast iron having the following composition: ______________________________________
C Si Mn Ni Cr
______________________________________
%
##STR19##
##STR20##
##STR21##
##STR22##
<0.15
______________________________________
Claim 6
Dependent Claim
37 words
A roll according to claim 3, wherein the case metal has the following composition, in percent: ______________________________________
C Si Mn S P Cr Ni Mo V
______________________________________
0.715
0.470 0.705 0.025 0.020
9.60 0.68 1.150 0.535
______________________________________
Claim 7
Dependent Claim
37 words
A roll according to claim 4, wherein the heart metal has the following compositions, in percent: ______________________________________
C Si Mn S P Cr Ni Mo Mg
______________________________________
3.02 2.42 0.48 0.008 0.022
0.10 0.50 -- 0.055
______________________________________
References Cited (Backward Citations)
FR2086561A5
Cited
SU596653A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |