Method for quenching ferrous tubing to achieve full hardening wi

Details Method for quenching ferrous tubing to achieve full hardening wi Method for quenching ferrous tubing to achieve full hardening wi

1976-02-02

1977-06-28

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148145, 148153, 148157, C21D 908

Patent

active

040323692

ABSTRACT:
A method for bringing a quenching medium into contact with both the inner and outer wall surfaces of metallic tubing, characterized in that a quenching liquid is fed into the interior of the tubing and pressurized, followed by quenching of the outer wall surface, preferably by immersion in a tank containing a quenching liquid. Pressurization of the quenching liquid fed into the interior of the tubing insures uniform wall contact of the liquid around the inner wall surface and along the entire length of the tubing. This brings about uniform hardness characteristics throughout the thickness of the tube walls and along its entire length and eliminates or reduces quench-crack problems inherent in prior art quenching systems wherein the quenching medium within the tubing is not pressurized.

REFERENCES:
patent: 3212766 (1965-10-01), Heinenberg et al.

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