Process for the continuous hardening of tubes

Details Process for the continuous hardening of tubes Process for the continuous hardening of tubes

C - Chemistry, Metallurgy

21

D

148/36, 38/5

C21D 9/14 (2006.01) C21D 9/08 (2006.01)

Patent

CA 1069417

ABSTRACT OF THE DISCLOSURE The present invention provides a process for the contin- uous hardening of tubes in a horizontal position, wherein a plurality of tubes is arranged end-to-end and advanced helically while being heated externally by heating gas, flames, radiators or inductive currents, subsequently heated internally by radia- tion or electro-inductively, and subsequently cooled both external- ly and internally by a cooling medium, the speed of advance of the tubes being from time to time temporarily accelerated to divide the substantially continuous line of tubes into individual tubes. The present invention also provides an apparatus for effecting said process which comprises a roller table for the helical transport of the tubes, an external heat source for the e?cernal heating of the tubes, at least one external spraying ring for external cooling of the tube, an internal electrical heat source for internal heating of the tubes and an internal spraying head for internal cooling of the tubes, the internal heat source and the internal spraying head being located within the tube and carried by a tubular support clamped at any one time in at least one of a pair of two-part clamping devices spaced at least at a distance of more than one or two tube lengths from the internal spraying head and being displaceable transversely rela- tive to the tube axis, the internal spraying head being located in a region downstream of the external heat source, viewed in the direction of travel of the tubes, the electric energy being adapted to be supplied to the internal heat source through the tubular support and energy transfer being adapted to be carried out at the clamping devices.

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