Process for producing a multilayer pipe having a metallurgical bond by drawing, and multilayer pipe produced by this process

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United States of America Patent

PATENT NO 10941885
APP PUB NO 20160273683A1
SERIAL NO

15030572

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Abstract

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The invention relates to a process for producing a multilayer pipe (1) from a tubular element having a metallurgical bond comprising at least one outer pipe (10) of metallic material and one inner pipe (20) of metallic material arranged within the outer pipe, the inner surface of the outer pipe (10) being mechanically bonded to the outer surface of the inner pipe (20) at least in parts of their interface, in which, in a production line, the tubular element is simultaneously heated and drawn, wherein each portion of the tubular element is submitted to heating by induction and then to hot-drawing, wherein the tubular element is drawn with a mandrel located therein. Through this process, the existing mechanical connection between the pipes is trans-formed in a metallurgical connection. The invention also relates to a multilayer pipe (1) produced for this process, wherein the outer pipe (10) is made of a carbon manganese steel alloy and the inner pipe (2) is made of a corrosion-resistant alloy.

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Patent Owner(s)

Patent OwnerAddress
VALLOUREC SOLUÇÕES TUBULARES DO BRASIL S ABELO HORIZONTE MG

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Da, Silva Penna Antonio Wagner Contagem, BR 2 6
Da, Silva Perdigao Hezick Belo Horizonte, BR 2 6
Ebeling, Timo Belo Horizonte, BR 2 6
Granha, Giorgini Danielle Belo Horizonte, BR 2 6
Silveira, E Silva Julio Marcio Belo Horizonte, BR 4 9

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