Drawn rods made of lead brass and a process for the thermal treatment thereof
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United States of America Patent
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Oct 13, 1981
Grant Date -
N/A
app pub date -
Oct 2, 1979
filing date -
Oct 2, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process and article of manufacture relating to drawn rods made of lead brass which has been subjected to at least one intermediate annealing treatment, the invention involves annealing at a temperature of between 425.degree. C. and a temperature which is 10.degree. lower than the solidus point for a period of between 1/100 of a second and one minute. The rods thus obtained contain uncoalesced lead particles having a dimension of less than 1.5 micrometers and contain at least 8000 of these lead particles per square millimeter and for each percent of lead. The rods produce fine shavings during machining and do not cause blocking on breakage. The present lead brass rods are particularly useful for automatic screw thread cutting.
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