E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/69
E21B 10/50 (2006.01) B23K 35/32 (2006.01) C22C 29/08 (2006.01)
Patent
CA 1336285
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 80 mesh single crystal monotungsten carbide.
585562
Armstrong Brian John
Kar Naresh Jitendra
Keshavan Madapusi Kande
Oldham Thomas Walter
Roth Cary Allen
Oyen Wiggs Green & Mutala Llp
Smith International Inc.
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