Method of making a chain
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United States of America Patent
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Aug 31, 2004
Issued Date -
N/A
app pub date -
Aug 8, 2003
filing date -
Feb 8, 2001
priority date (Note) -
Expired
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Abstract
In a method of making a chain, in particular a round steel chain of tempered steel, a chain strand is produced in a conventional manner and subject to the usual heat treatment of normalizing, hardening and annealing. Annealing is implemented at a low temperature level of below 200.degree. C. A tempered steel is used having a microstructure which, after hardening and annealing, has a stable residual austenite content between 3% and 10%. After the final calibration process, the chain strand is subjected to a thermal aftertreatment at a temperature between 190.degree. C. and 250.degree. C. This relieves stress resulting from the calibration process and the associated work-hardening. In this way, the notch impact energy capacity is enhanced.
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