Aeg-elotherm G.m.b.h.

Herbert Geisel

Friedhelm Reinke

Friedhelm Emde

Rolf Gies

Klaus Lange

Hermann Voss

Manfred Schoenen

Friedrich Muller-Axt

A process for heating at least two metal pipes wherein each pipe is individually preheated in response to sensors detecting its initial temperature and wall thickness. The pipe then passes through a continuous heater which applies an equal amount of energy to each portion of the pipe, after which each pipe emerges having a predetermined temperature independent of both its initial temperature and the wall thickness.

Method of heating of at least two elongated tubular metallic objects

A method for producing a welded and quench hardened steel pipe and pipe whereby the weld seam running spirally or longitudinally along the pipe length has a lower austenization temperature than the pipe and/or a higher electrical resistance. The ratio of the pipe to seam resistance is preferably greater than one half and the whole of the square of the ratio between pipe wall thickness and mean seam thickness. The seam preferably includes amounts of C, Si, and Mn in the same percentage as the pipe plus nickel between 2-6%.

Pipe and process for producing a welded and quench hardened steel

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Remscheid-Luttringhausen, Germany

Herbert Geisel