ORGANIC COATING CHARACTERISTICS OF COLD ROLLED STEEL

摘要

The invention provides a novel method of increasing the corrosion resistance and improving the organic coating characteristics of cold rolled steel. In practicing the method, cold rolled steel in the as rolled condition having iron oxide and thermally degradable rolling oil on the surface thereof is heat treated at a temperature 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 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 contains: ?ock having a hardened coating of an organic protective coating thereon. The invention further provides the various products produced by the method of the invention.