Roller cone bits with wear and fracture resistant surface

Details Roller cone bits with wear and fracture resistant surface Roller cone bits with wear and fracture resistant surface

2006-05-23

2009-06-09

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S426000, C076S108200

Reexamination Certificate

active

07543661

ABSTRACT:
Roller cone bits of this invention include a steel bit body having at least one leg extending therefrom. A steel cone is rotatably disposed on the leg. The steel cone includes a plurality of steel cutting elements that each project outwardly a distance therefrom. At least one of the cutting elements comprises a steel base portion that is integral with the cone and that projects a distance therefrom. A cutting element end portion is attached to the base portion and extends therefrom to form a tip of the cutting element. The base and end portions are permanently attached together when the cone and base are in a preexisting rigid state. The cutting element end portion is formed from a wear resistant material having a material microstructure comprising a first phase of grains selected from the group of carbides, borides, nitrides, and carbonitrides of W, Ti, Mo, Nb, V, Hf, Ta, and Cr refractory metals; and a second phase of a binder material selected from the group consisting of Co, Ni, Fe, and alloys thereof.

REFERENCES:
patent: 6206115 (2001-03-01), Overstreet et al.
patent: 6571889 (2003-06-01), Griffo et al.
patent: 6615935 (2003-09-01), Fang et al.
patent: 7048080 (2006-05-01), Griffo et al.

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