Hollow drilling steel rod and method of manufacturing the same
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United States of America Patent
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Apr 30, 2013
Grant Date -
Aug 23, 2012
app pub date -
Feb 17, 2012
filing date -
Feb 18, 2011
priority date (Note) -
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Abstract
The present invention relates to a hollow drilling steel rod including a stem portion and a thread portion positioned at an end portion in an axial direction with respect to the stem portion, the hollow drilling steel rod being constituted of a steel having a specific composition described in the present specification, in which the thread portion includes a thread having been subjected to a high frequency quenching, and the thread portion and the stem portion separate from each other have been joined by a friction welding.
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