Hardfacing on steel tooth cutter element

Details Hardfacing on steel tooth cutter element Hardfacing on steel tooth cutter element

1997-04-04

2000-02-29

Schoeppel, Roger

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175425, E21B 1000

Patent

active

06029759&

ABSTRACT:
A steel tooth particularly suited for use in a rolling cone bit includes a parent metal core having an inner gage facing surface, leading and trailing edges, a root region adjacent to the cone and an outer most edge spaced from the root region. A hardfacing layer that includes at least two hardfacing materials having differing wear characteristics is disposed over the parent metal core in an asymmetric arrangement of regions of the first and second materials. A first of the hardfacing materials has a higher low stress abrasive wear resistance than that of the second material. The second material has a high stress abrasion resistance that is greater than the first material. The first and second materials are applied in generally contiguous regions over the entire gage facing surface of the parent metal core so as to optimize regions of the tooth for the particular cutting duty experience by that region.

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Smith International, Inc. internal documents; Exhibit A comprises drawings of certain cutter inserts that were included on drill bits sold before Apr. 4, 1997; Exhibit B includes a drawing of a cutter insert that was included on drill bits sold before Apr. 4, 1997; (See accompanying IDS).

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