METHOD OF MANUFACTURING SEAMLESS STEEL PIPE

Title:

METHOD OF MANUFACTURING SEAMLESS STEEL PIPE

Document Type and Number:

WIPO Patent Application WO/2003/064070

Kind Code:

A1

Abstract:

A method of manufacturing a seamless steel pipe capable of suppressing a nonuniform wall thickness produced in a pressing down direction of a mandrel mill as well as a nonuniform wall thickness produced at positions displaced from the pressing down direction, comprising the steps of rolling a seamless steel pipe in a production line comprising the mandrel mill (11) having a plurality of stands (11₁ to 11₅) with hole type rolls continuously disposed with the pressing down directions thereof differentiated from each other, measuring the wall thickness of the rolled steel pipe (14) in a circumferential direction, and based on the measured results, individually controlling the both side closed amounts of the hole type roll at least in the pair of final pressing down stands (11₄, 11₅) of the mandrel (11) so that the nonuniform wall thickness becomes minimum.

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Inventors:

SASAKI KENICHI (JP)
YAMANE AKIHITO (JP)

Application Number:

PCT/JP2003/000751

Publication Date:

August 07, 2003

Filing Date:

January 27, 2003

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
SASAKI KENICHI (JP)
YAMANE AKIHITO (JP)

International Classes:

B21B17/04; B21B17/02; B21B37/18; B21B37/78; B21B17/14; B21B38/04; (IPC1-7): B21B37/78; B21B17/02

Foreign References:

JPH0871616A	1996-03-19
JPH105817A	1998-01-13
JPS617010A	1986-01-13

Other References: