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Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same

  • US 9,340,847 B2
  • Filed: 04/10/2012
  • Issued: 05/17/2016
  • Est. Priority Date: 04/10/2012
  • Status: Active Grant
First Claim
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1. A method of manufacturing a steel tube, comprising:

  • casting a steel having a composition into a bar or slab, the composition comprising;

    about 0.18 to about 0.32 wt. % carbon;

    about 0.3 to about 1.6 wt. % manganese;

    about 0.1 to about 0.6 wt. % silicon;

    about 0.005 to about 0.08 wt. % aluminum;

    about 0.2 to about 1.5 wt. % chromium;

    about 0.2 to about 1.0 wt. % molybdenum; and

    the balance comprises iron and impurities;

    wherein the amount of each element is provided based upon the total weight of the steel composition;

    forming a tube;

    quenching the tube from an austenitic temperature to form a quenched tube;

    cold drawing the quenched tube to form a final tube; and

    tempering the final tube to form the steel tube.

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