Process for making internally hardened tubes

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

C - Chemistry, Metallurgy

21

D

38/22, 148/29

C21D 9/08 (2006.01) C21D 1/10 (2006.01) C21D 1/18 (2006.01) C21D 9/14 (2006.01)

Patent

CA 1265420

"PROCESS FOR MAKING INTERNALLY HARDENED TUBES" ABSTRACT OF THE DISCLOSURE 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.

486892

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