US4623561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of marking a hot steel slab
Assignee: Tata Steel Ijmuiden BV
•
Filing: 1985-07-15
•
Granted: 1986-11-18
•
Expires: 2005-07-15
Abstract
Abstract A method of applying a visible mark on a hot steel slab is described. The adherence of the marking composition to the slab surface can be improved by removing locally iron oxide therefrom, followed by the step of locally cooling down the surface to prevent secondary oxide growth. This is done by first directing a water jet of high pressure at an acute angle to the slab surface immediately followed by a gentle water stream of low pressure. After this conditioning of the surface, the mark can be sprayed thereon.
Inventors
- 👤 Jan C. Groothuizen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:34
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/12; B22D11/1233; Y; Y10; Y10T; Y10T29/00; Y10T29/45; Y10T29/4533; Y10T29/4544
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
Method of marking a hot steel slab, including the step of descaling a chosen surface region at a side of the slab by directing a water jet of high pressure at an acute angle to said surface region in order to remove locally iron oxide therefrom, followed by the step of cooling down below 900° C. the so descaled surface region by directing a gentle water stream at a low pressure in order to prevent secondary oxide growth, and by the step of spraying a water-based marking composition in the required pattern on said descaled and cooled down surface region at the said side of the slab.
Claim 2
Dependent Claim
107 words
Method of marking a hot steel slab, including the step of descaling a chosen surface region at a side of the slab by directing a water jet of high pressure at an acute angle to said surface region in order to remove locally iron oxide therefrom, followed by the step of cooling down below 900° C. the so descaled surface region by directing a gentle water stream at a low pressure in order to prevent secondary oxide growth, and by the step of spraying a water-based marking composition in the required pattern on said descaled and cooled down surface region at the said side of the slab.
Claim 3
Dependent Claim
37 words
Method of marking a hot steel slab according to claim 1, wherein the pressure of the high pressure water jet lies above 150 bars and the pressure of the low pressure water stream is about 10 bars.
Claim 4
Dependent Claim
29 words
Method according to claim 1, characterized in that the high pressure water jet is a flat jet, directed at an acute angle of about 15° with the slab surface.
Claim 5
Dependent Claim
28 words
Method according to claim 2, characterized in that the high pressure jet is a flat jet, directed at an acute angle of about 15° with the slab surface.
Claim 6
Dependent Claim
33 words
Method according to claim 1, 2, 3 or 4, characterized in that the high pressure water jet is moved to and fro at least two times over the chosen surface region parallel thereto.
Claim 7
Dependent Claim
32 words
Method according to claim 5, characterized in that the high pressure water jet is moved three times over the chosen surface region at a uniform speed of about 300 mm per second.
References Cited (Backward Citations)
US3543775A
Cited
US3826681A
Cited
JPS515821A
Cited
CA1043954A
Cited
GB1534651A
Cited
GB1541732A
Cited
US4233830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |