Method for producing a ring-pull top from a steel sheet provided with a protective layer and a ring-pull top produced thereby
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United States of America Patent
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Apr 18, 2017
Grant Date -
Sep 17, 2015
app pub date -
Oct 2, 2012
filing date -
Dec 22, 2011
priority date (Note) -
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Abstract
The invention relates to the use of a steel sheet provided with a protective layer for producing a ring-pull top or a can having a ring-pull top, where the steel sheet is made of an unalloyed or low-alloy steel having a carbon content of less than 0.1% by weight, and also an associated process. The problem proceeding from known steel sheets having a protective layer, namely to provide a steel sheet by means of which ring-pull tops which for a constant residual wall thickness of the notch line have a lower tear-off force can be produced by means of the ring-pull top, is solved by the steel sheet being recrystallizingly heat treated at a heating rate of more than 75 K/s and after the recrystallizing heat treatment cooled at a cooling rate of at least 100 K/s and then coated with the protective layer.
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