Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1987-12-29
1989-06-06
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
51309, 75240, 428557, E21B 1050
Patent
active
048363073
ABSTRACT:
A hard facing for teeth on a milled tooth rock bit comprises at least 65% by weight of a mixture of tungsten carbide particles and a balance of steel bonding the carbide particles together and to the cutter cone of the rock bit. The tungsten carbide particle mixture comprises from 35% to 80%, and preferably from 65% to 80%, by weight 20 to 30 mesh cemented tungsten carbide, and from 20% to 65%, and preferably from 20% to 35% by weight 40 to 89 mesh single crystal monotungsten carbide.
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Armstrong Brian J.
Kar Naresh J.
Keshavan Madapusi K.
Oldham Thomas W.
Roth Cary A.
Bagnell David J.
Novosad Stephen J.
Smith International Inc.
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