Expansion process for reducing the stresses in a seamless metal

Details Expansion process for reducing the stresses in a seamless metal Expansion process for reducing the stresses in a seamless metal

1977-09-22

1979-11-13

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

29421R, 72 61, 148131, C23F 700

Patent

active

041742338

ABSTRACT:
A process for reducing the residual stresses in a seamless metal tube which has undergone a straightening operation comprising subjecting the tube to an internal pressure of between 0.8 Pc and 1.0 Pc for a period of at least 3 minutes, while maintaining the temperature of the tube at or close to ambient temperature, Pc being the critical pressure beyond which the tube will undergo plastic deformation.

REFERENCES:
patent: 3343249 (1967-09-01), Breit, Jr. et al.
patent: 3456831 (1969-07-01), Johansson
patent: 3535484 (1970-10-01), Snow et al.
patent: 3817796 (1974-06-01), Kramer
patent: 3979231 (1976-09-01), Gondo et al.
Berge et al., "Residual Stresses in Bent Tubes for Nuclear Steam Generators" CORROSION-NACE, vol. 32, No. 9, Sep. 1976, pp. 357-364.
Schenk, "Investigation of Tube Failures in Inconel 600 Steam Generator Tubing at KWO Obrigheim," MATERIALS PERFORMANCE, Mar. 1976, pp. 25-33.
Van Rooyen, "Review of Stress Corrosion Cracking of Inconel 600," CORRISION-NACE, vol. 31, No. 9, Sep. 1975, pp. 327-337.

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