The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 1976
Filed:
Mar. 10, 1975
Gordon L Peters, Weirton, WV (US);
William T Saunders, Weirton, WV (US);
National Steel Corporation, Pittsburgh, PA (US);
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.