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US 7,900,719 B2Granted
Bi-steel percussive drill rod
AssigneeLongyear TM, Inc.
InventorJing James Yao
Life of this patent
Estimating the term…
Abstract
A drill rod includes a first end section, a mid-section, wherein the first end section and the mid-section are connected and wherein the first end section is manufactured using different steel than is used for the mid-section. Such a configuration can reduce the costs associated with forming a drill rod while maintaining the functionality of such a drill rod.
Claims21
A drill rod comprising:
- a first end section comprising non-bainitic steel;
- a mid-section having a substantially uniform diameter, wherein the mid-section comprises a bainitic steel;
- and
- a joint connecting the first end section to the mid-section, the joint comprising non-bainitic steel material of the first end section directly welded to bainitic material of the mid-section.
1 more element
A method of manufacturing a drill rod, the method comprising:
- providing a first end section including a non-bainitic high-grade structural steel;
- providing a mid-section including an at least partially bainitic steel;
- and
- welding non-bainitic high-grade structural steel material of the first end section directly to bainitic steel material of the mid-section to secure the first end section to the mid-section.
1 more element
A drill rod comprising:
- a first end section formed from a high grade structural steel;
- a mid-section connected to the first end section, the mid-section being formed from an at least partially bainitic steel;
- a second section connected to the mid-section, the second section being made from a high grade structural steel;
- and
- a first weld zone connecting bainitic steel material of the mid-section directly to non-bainitic steel material of the first end section, the first weld zone being at least partially carburized.
2 more elements
A drill rod comprising:
- a first end section;
- and
- a mid-section, wherein the first end section and the mid-section are connected, and wherein the first end section is manufactured using a different steel than is used for the mid-section,
- wherein the steel used for the mid-section includes:
- carbon in a weight percentage of 0.16% to 0.22%, silicon in a weight percentage of 1.1% to 1.4%, manganese in a weight percentage of 1.9% to 2.3%, chromium in a weight percentage of 0.8% to 1.1%, molybdenum in a weight percentage of 0.25% to 0.35%, phosphorous in a weight percentage not greater than 0.02%, sulphur in a weight percentage not greater than 0.02%, and copper in a weight percentage not greater than 0.2%.
2 more elements
Dependencies are inferred from the claim text.