Thin-walled small-bore steel tube with case hardened internal su

Details Thin-walled small-bore steel tube with case hardened internal su Thin-walled small-bore steel tube with case hardened internal su

1985-07-17

1990-08-21

Recla, Henry J.

Pipes and tubular conduits

Structure

148150, 148 124, 148145, 148320, 148909, F16L 900, C22C 3500

Patent

active

049497588

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: 2256455 (1941-09-01), Crawford
patent: 2604419 (1952-07-01), Herbenar
patent: 3345220 (1967-10-01), Haynes
patent: 3891474 (1975-06-01), Grange
patent: 4204892 (1980-05-01), Economopoulos
patent: 4210468 (1980-07-01), McGee
patent: 4226645 (1980-10-01), Waid et al.
patent: 4261769 (1981-04-01), Usui
patent: 4366008 (1982-12-01), Takeuchi et al.

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