Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1997-03-12
1998-08-11
Schoeppel, Roger J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175425, 4285395, E21B 1000
Patent
active
057914222
ABSTRACT:
An improved hardfacing for teeth and other surfaces of milled tooth rock bits includes steel in the range of from 20 to 50 percent by weight, and filler in the range of from 50 to 80 percent by weight. The filler includes spherical cast tungsten carbide particles alone or in a mixture of other tungsten carbide particles such as crushed cast spherical or crushed cemented tungsten carbide, macrocrystalline tungsten carbide, or the like. The single crystal monotungsten tungsten carbide particles have a particle size in the range of from 16 to 40 mesh and/or in the range of from 80 to 200 mesh.
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Fang Zhigang
Liang Dah-Ben
Sue Jiinjen Albert
White Alysia C.
Schoeppel Roger J.
Smith International Inc.
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