Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same
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United States of America Patent
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May 17, 2016
Grant Date -
Oct 10, 2013
app pub date -
Apr 10, 2012
filing date -
Apr 10, 2012
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Abstract
Embodiments of the present disclosure are directed to methods of manufacturing steel tubes that can be used for mining exploration, and rods made by the same. Embodiments of the methods include a quenching of steel tubes from an austenitic temperature prior to a cold drawing, thereby increasing mechanical properties within the steel tube, such as yield strength, impact toughness, hardness, and abrasion resistance. Embodiments of the methods reduce the manufacturing step of quenching and tempering ends of a steel tube to compensate for wall thinning during threading operations. Embodiments of the methods also tighten dimensional tolerances and reduce residual stresses within steel tubes.
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