Method of manufacture of seamless capillary thin-walled vacuum-t

Details Method of manufacture of seamless capillary thin-walled vacuum-t Method of manufacture of seamless capillary thin-walled vacuum-t

1977-03-18

1978-03-21

Stallard, W.

Metal treatment

Compositions

Heat treating

C22C 504

Patent

active

040802248

ABSTRACT:
A pipe billet is drawn and reduced by stages, each time decreasing the cross-sectional area of its walls by 60-80% and annealing it at 830.degree. .+-. 30.degree. C after each drawing stage. This procedure is continued until the wall thickness of the billet decreases to 0.24 - 0.30 mm; then the billet is again drawn and reduced by stages, each time decreasing the cross-sectional area of the produced pipe by 28 - 50% and annealing the pipe at 750.degree. .+-. 20.degree. C after each drawing stage.
The method of manufacture of seamless pipes according to the invention allows making capillary thin-walled pipes from palladium-based alloys that will withstand a vacuum of 10.sup.-3 - 10.sup.-4 mm Hg and remain vacuum-tight after 1000 hr of operation in hydrogen-containing media.

REFERENCES:
patent: 3155467 (1964-11-01), Yamamoto et al.
patent: 3172742 (1965-03-01), Rubin
patent: 3804616 (1974-04-01), Goltsov et al.

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