Procedure for producing coil-forming tubes in an inert enviromen

Details Procedure for producing coil-forming tubes in an inert enviromen Procedure for producing coil-forming tubes in an inert enviromen

1989-09-01

1991-10-29

Larson, Lowell A.

Metal deforming

With exposure of work to gas, vapor, mist, or modified...

72364, B21B 900

Patent

active

050604961

ABSTRACT:
A procedure for producing coil-forming tubes, in which the tubes are heated to a temperature of 1,000.degree.-1,100.degree. C., particularly to 1,050.degree. C. and then bent at temperatures of more than 850.degree. C. The method proceeds in such a way that the tubes are flushed with N.sub.2 or an N.sub.2 atmosphere is maintained during the heating and during the bending process, in order to increase the service life of such tubes.

REFERENCES:
patent: 3257835 (1966-06-01), Cofer et al.
patent: 3613421 (1971-10-01), Repper
Metals Handbook, vol. 4, 8th Edition (1977), p. 313.

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