US3983305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of increasing the corrosion resistance and improving the organic coating characteristics of cold rolled steel and the products thus prepared
Assignee: National Steel Corp
•
Filing: 1975-03-10
•
Granted: 1976-09-28
•
Expires: 1995-03-10
Abstract
Abstract The invention provides a novel method of increasing the corrosion resistance and improving the organic coating characteristics of cold rolled flat steel. In practicing the method, cold rolled flat steel in the as rolled condition having iron oxide and thermally degradable rolling oil on the surface thereof is heat treated at a tempterature sufficiently elevated to thermally degrade the rolling oil. The surface of the cold rolled steel has a relatively low corrosion resistance and relatively poor organic coating characteristics initially, and the heat treatment is continued until the corrosion resistance and the organic coating characteristics of the resulting heat treated steel are improved. Thereafter the heat treated steel is cooled to a temperature sufficiently low to prevent further thermal degradation of the rolling oil and produce a residual film on the heat treated steel surface which imparts corrosion resistance and improved organic coating characteristics. In a further variant of the invention, as rolled cold rolled flat steel of container stock gage is heat treated as described above, a hardenable fluid organic protective coating composition is applied to the resulting cooled heat treated steel, and thereafter the coating composition is hardened to produce container stock having a hardened coating of an organic protective coating thereon. The invention further provides the various products produced by the method of the invention.
Inventors
- 👤 Gordon L. Peters
- 👤 William T. Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:08
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31714
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
158 words
A method of increasing the corrosion resistance of cold rolled flat steel and improving the organic coating characteristics of the surface thereof comprising heat treating as rolled cold rolled flat steel having iron oxide and thermally degradable rolling oil on the surface thereof at a temperature of 400°-800° F. to thermally degrade the rolling oil, the surface of the cold rolled flat steel having relatively low corrosion resistance and relatively poor organic coating characteristics initially and the heat treatment being continued for not more than 10 seconds until the corrosion resistance and the organic coating characteristics of the resulting heat treated steel are improved, and immediately cooling the said heat treated steel to a temperature not greater thaan 200° F. to prevent further thermal degradation of the rolling oil, the surface of the resulting cooled heat treated steel having a residual film thereon containing iron oxide and thermally degraded rolling oil which imparts corrosion resistance and improved organic
Claim 2
Independent Claim
158 words
A method of increasing the corrosion resistance of cold rolled flat steel and improving the organic coating characteristics of the surface thereof comprising heat treating as rolled cold rolled flat steel having iron oxide and thermally degradable rolling oil on the surface thereof at a temperature of 400°-800° F. to thermally degrade the rolling oil, the surface of the cold rolled flat steel having relatively low corrosion resistance and relatively poor organic coating characteristics initially and the heat treatment being continued for not more than 10 seconds until the corrosion resistance and the organic coating characteristics of the resulting heat treated steel are improved, and immediately cooling the said heat treated steel to a temperature not greater thaan 200° F. to prevent further thermal degradation of the rolling oil, the surface of the resulting cooled heat treated steel having a residual film thereon containing iron oxide and thermally degraded rolling oil which imparts corrosion resistance and improved organic
Claim 3
Dependent Claim
13 words
The heat treated cold rolled flat steel prepared by the method of claim
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the cold rolled flat steel is heat treated
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein at least one gram per base box of thermally degradable rolling oil is on the cold rolled steel surface to be
Claim 6
Dependent Claim
13 words
The heat treated cold rolled flat steel prepared by the method of claim
Claim 7
Dependent Claim
26 words
The method of claim 1 wherein the said residual film on the heat treated steel surface contains at least 0.05 gram per base box of thermally
Claim 8
Dependent Claim
13 words
The heat treated cold rolled flat steel prepared by the method of claim
Claim 9
Dependent Claim
26 words
The method of claim 1 wherein the cold rolled flat steel is heat treated at a temperature of 500°-700° F. for a period of not more
Claim 10
Dependent Claim
13 words
The heat treated cold rolled flat steel prepared by the method of claim
Claim 11
Dependent Claim
41 words
The method of claim 1 wherein about 2-25 grams per base box of rolling oil is on the cold rolled steel surface to be heat treated and the said residual film on the heat treated steel surface contains about 0.1-1 gram
Claim 12
Dependent Claim
13 words
The heat treated cold rolled flat steel prepared by the method of claim
Claim 13
Dependent Claim
75 words
The method of claim 1 wherein about 10-15 grams per base box of rolling oil is on the cold rolled steel surface to be heat treated, the steel is heat treated at a temperature of about 500°-700° F. for not more than 5 seconds, the said heat treated steel is cooled to a temperature less than 200° F. following the heat treatment and the said residual film on the heat treated steel surface contains about
Claim 14
Dependent Claim
13 words
The heat treated cold rolled flat steel prepared by the method of claim
Claim 15
Dependent Claim
89 words
The method of claim 1 wherein about 10 grams per base box of rolling oil is on the cold rolled steel surface to be heat treated, the steel is heat treated by induction heating at a temperature of about 600° F. for not more than one second, the said heat treated steel is cooled to a temperature less than 100° F. immediately following the heat treatment, and the said residual film on the heat treated steel surface contains about 0.3 gram per base box of thermally degraded rolling oil.
Claim 16
Dependent Claim
13 words
The heat treated cold rolled flat steel prepared by the method of claim
Claim 17
Independent Claim
186 words
A method of preparing container stock coated with an organic protective coating comprising heat treating as rolled cold rolled steel of container stock gage having iron oxide and thermally degradable rolling oil on the surface thereof at a temperature of 400°-800° F. to thermally degrade the rolling oil, the surface of the cold rolled steel having relatively low corrosion resistance and relatively poor organic coating characteristics initially and the heat treatment being continued for not more than 10 seconds until the corrosion resistance and the organic coating characteristics of the resulting heat treated steel are improved. immediately cooling the said heat treated steel to a temperature not greater than 200° F. to prevent further thermal degradation of the rolling oil, the surface of the resulting cooled heat treated steel having a residual film thereon containing iron oxide and thermally degraded rolling oil which imparts corrosion resistance and improved organic coating characteristics thereto, applying a coating of a hardenable fluid organic protective coating composition for container stock on the surface of the cooled heat treated steel, and thereafter hardening the said fluid organic coating composition to produce
Claim 18
Independent Claim
186 words
A method of preparing container stock coated with an organic protective coating comprising heat treating as rolled cold rolled steel of container stock gage having iron oxide and thermally degradable rolling oil on the surface thereof at a temperature of 400°-800° F. to thermally degrade the rolling oil, the surface of the cold rolled steel having relatively low corrosion resistance and relatively poor organic coating characteristics initially and the heat treatment being continued for not more than 10 seconds until the corrosion resistance and the organic coating characteristics of the resulting heat treated steel are improved. immediately cooling the said heat treated steel to a temperature not greater than 200° F. to prevent further thermal degradation of the rolling oil, the surface of the resulting cooled heat treated steel having a residual film thereon containing iron oxide and thermally degraded rolling oil which imparts corrosion resistance and improved organic coating characteristics thereto, applying a coating of a hardenable fluid organic protective coating composition for container stock on the surface of the cooled heat treated steel, and thereafter hardening the said fluid organic coating composition to produce
Claim 19
Dependent Claim
10 words
The container stock coated with an organic protective coating prepared
Claim 20
Dependent Claim
10 words
The container stock coated with an organic protective coating prepared
Claim 21
Dependent Claim
14 words
The method of claim 16 wherein the cold rolled steel is heat treated by
Claim 22
Dependent Claim
43 words
The method of claim 16 wherein at least one gram per base box of thermally degradable rolling oil is on the cold rolled steel surface to be heat treated and the said residual film on the heat treated steel surface contains at least
Claim 23
Dependent Claim
10 words
The container stock coated with an organic protective coating prepared
Claim 24
Dependent Claim
10 words
The container stock coated with an organic protective coating prepared
Claim 25
Dependent Claim
62 words
The method of claim 16 wherein about 2-25 grams per base box of rolling oil is on the cold rolled steel surface to be heat treated, the cold rolled steel is heat treated at a temperature of about 500°-700° F. for a period of not more than 5 seconds, and the said residual film on the heat treated steel surface contains about
Claim 26
Dependent Claim
10 words
The container stock coated with an organic protective coating prepared
Claim 27
Dependent Claim
10 words
The container stock coated with an organic protective coating prepared
Claim 28
Dependent Claim
75 words
The method of claim 16 wherein about 10-15 grams per base box of rolling oil is on the cold rolled steel surface to be heat treated, the steel is heat treated at a temperature of about 500°-700° F. for not more than 5 seconds, the said heat treated steel is cooled to a temperature less than 200° F. following the heat treatment, and the said residual film on the heat treated steel surface contains about
Claim 29
Dependent Claim
10 words
The container stock coated with an organic protective coating prepared
Claim 30
Dependent Claim
10 words
The container stock coated with an organic protective coating prepared
Claim 31
Dependent Claim
89 words
The method of claim 16 wherein about 10 grams per base box of rolling oil is on the cold rolled steel surface to be heat treated, the steel is heat treated by induction heating at a temperature of about 600° F. for not more than one second, the said heat treated steel is cooled to a temperature less than 100° F. immediately following the heat treatment, and the said residual film on the heat treated steel surface contains about 0.3 gram per base box of thermally degraded rolling oil.
Claim 32
Dependent Claim
16 words
The container stock coated with an organic protective coating prepared by the method of claim 25.
References Cited (Backward Citations)
US1362213A
Cited
US2288980A
Cited
US2501128A
Cited
US2833672A
Cited
US3052014A
Cited
US3457097A
Cited
US3600780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |