Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1997-05-05
1999-08-31
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
51309, 501 87, B24D 302, E21B 1050
Patent
active
059441275
ABSTRACT:
A hardfacing material for shirttail and gage surfaces of a rock bit cone and a gage row of rock bit teeth comprises steel in the range of from 20 to 40 percent by weight, and tungsten carbide particles in the range of from 60 to 80 percent by weight which contains single crystal monotungsten carbide particles having a particle size primarily less than about 200 mesh with a preferred average particle size in the range of from 30 to 70 microns. According to further embodiments, carburized tungsten carbide particles and/or spherical cast carbide particles are mixed with the single crystal monotungsten carbide in the hardfacing. The carburized tungsten carbide particles have a particle size in the range of from about 10 to 50 microns. The spherical cast tungsten carbide particles have a particle size in the range of from about 20 to 150 microns. The particle size distributions of the tungsten carbide particles are bimodal or trimodal for improved weldability and wear resistance in the hardfacing.
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Fang Zhigang
Liang Dah-Ben
Sue Jiinjen Albert
White Alysia C.
Bagnell David J.
Smith International Inc.
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