Method for protecting from hardening a selected region of a stee

Details Method for protecting from hardening a selected region of a stee Method for protecting from hardening a selected region of a stee

1985-10-24

1987-05-12

Brody, Christopher W.

Metal treatment

Compositions

Heat treating

148 165, 148 166, 148 635, 427282, 427287, C21D 174

Patent

active

046647228

ABSTRACT:
A method for hardening a selected region of a steel bearing surface of an earth boring bit using the steps of stretching a rubber protector over a seal region to be protected from treatment (the rubber being selected from the group consisting of silicone, neoprene and nitrile), exposing the bearing surface and protector to a medium (selected from the group consisting of carburizing, nitriding, carbonitriding, siliconizing, chromizing and boronizing) of the type for altering the chemical composition of the steel to be hardened, heating the medium and bearing surface, cooling the bearing and protector, and removing and cleaning the surface.

REFERENCES:
patent: 1705674 (1929-03-01), Merten
patent: 2742382 (1956-04-01), Chambers
patent: 3527624 (1970-09-01), Biretta et al.
patent: 3873376 (1975-03-01), Ritzka
patent: 4062702 (1977-12-01), Kunst et al.
patent: 4102838 (1978-07-01), Scales
patent: 4165243 (1979-08-01), Sarnes et al.
patent: 4204437 (1980-05-01), Espana

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