METHOD FOR CORRECTING PIPE END OF SEAMLESS PIPE FORMED FROM HIGH-CR STAINLESS STEEL

Title:

METHOD FOR CORRECTING PIPE END OF SEAMLESS PIPE FORMED FROM HIGH-CR STAINLESS STEEL

Document Type and Number:

WIPO Patent Application WO/2012/111307

Kind Code:

A1

Abstract:

A method for correcting the inner diameter of a pipe end of a seamless pipe formed from high-CR stainless steel containing 8 to 35 mass% of CR and 0.1 to 10 mass% of Ni comprises: a pipe end correction step with which the pipe end part of a seamless pipe is enlarged by inserting a plug for inner diameter correction into the pipe end part after a step for pipe production by hot working and a heat treatment step, when oxide scale build-up is generated on the inside surface at the pipe end part of a seamless pipe; and a step for forming a lubricant film with which, prior to this pipe end correction step, a lubricant is applied to the inside surface at the pipe end part of a seamless pipe and/or the plug surface to form a lubricant film. As a result, the formation of seizure marks on the inside of the pipe end part can be prevented when a high-CR stainless steel seamless pipe is produced.

Inventors:

MOCHIZUKI TOSHIO (JP)

Application Number:

PCT/JP2012/000948

Publication Date:

August 23, 2012

Filing Date:

February 14, 2012

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
MOCHIZUKI TOSHIO (JP)

International Classes:

B21B23/00; B21D41/02; B21B25/04; B21D3/14; C10M105/24; C22C38/00; C22C38/46; C10N10/02; C10N30/00; C10N40/24

Domestic Patent References:

WO2007132851A1	2007-11-22
WO2007114176A1	2007-10-11

Foreign References:

JP2010142810A	2010-07-01
JPS635807A	1988-01-11
JPH044906A	1992-01-09
JP2006000916A	2006-01-05
JP2006181611A	2006-07-13
JP2010142810A	2010-07-01

Other References: