Screw made of low-alloy carbon steel, and method for producing such a screw
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United States of America Patent
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May 17, 2016
Grant Date -
Nov 14, 2013
app pub date -
Nov 28, 2011
filing date -
Dec 20, 2010
priority date (Note) -
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Abstract
The invention relates to a screw having a head, an adjoining retaining section and a functional tip for use as a self-tapping screw. The functional tip is of greater hardness than the retaining section. The entire screw is made of hardened low-alloy carbon steel. The special feature of this screw is that its functional tip has a higher carbon and/or nitrogen content than its retaining section.
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