Process for making internally hardened tubes

Details Process for making internally hardened tubes Process for making internally hardened tubes

1986-10-06

1989-07-04

Brody, Christopher W.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148153, 148157, C21D 142

Patent

active

048447528

ABSTRACT:
The present invention relates to a process for hardening the interior surface of a long, thin-walled, small inside diameter, tubular member, such as a tube which would be used to form a downhole pump barrel. More particularly, it relates to a process involving progressive heating with an internally positioned, electro-magnetic induction coil, followed by immediate quenching with a quench ring assembly, to develop a martensitic case on the inner surface of the tube. The invention further extends to the apparatus utilized in conducting the process, and to the product tube itself.

REFERENCES:
patent: 2315558 (1943-04-01), Somes
patent: 2376515 (1945-05-01), Somes
patent: 2547053 (1951-04-01), Somes et al.
patent: 4375997 (1983-03-01), Matz
patent: 4531987 (1985-07-01), Pfaffman et al.

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