Cold-rolled fixing screw comprising a self-tapping thread
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United States of America Patent
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Issued Date -
May 31, 2007
app pub date -
Oct 29, 2004
filing date -
Dec 18, 2003
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Abandoned
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Abstract
The invention relates to a cold-rolled fixing screw consisting of a low-alloy carbon steel with a high degree of deformation according to the ratios of external diameter to core diameter of >1.2 and pitch to external diameter of >0.23, with a self-tapping thread for screwing into materials, in particular plastics. The screw material of said steel screw with a ferritic structure contains additional constituents with a substantially higher carbon content than the carbon that is contained in the ferrite. Said mixed structure has a maximum carbon content of 0.42 weight percent and a maximum grain size that corresponds to at least 2000 grain/mm.sup.2, preferably at least 3000 grains/mm.sup.2, with a residual stress that is impressed and maintained by the cold rolling process.
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