METHOD FOR PRODUCING PIERCING PLUG - NIPPON STEEL & SUMITOMO METAL CORP

Title:

METHOD FOR PRODUCING PIERCING PLUG

Document Type and Number:

WIPO Patent Application WO/2013/161175

Kind Code:

A1

Abstract:

This method for producing a plug used in a piercing mill used in the production of a seamless steel pipe includes: a shot blasting step for shot blasting the surface of a plug; and an arc spray step for forming a coating film by arc spraying a spraying wire at the base material surface of the plug subjected to the shot blasting. The arc spray step performs arc spraying using, as the spraying wire, a cored wire resulting from filling the interior of an iron tube with at least iron oxide particles among iron particles and iron oxide particles (one or more among FeO particles, Fe3O4 particles, and Fe2O3 particles), and a coating film is formed configured from the iron oxide and Fe. As a result, it is possible to produce a piercing plug that can have increased plug production efficiency, stability during piercing, and increased plug life.

Inventors:

YAMAMOTO TOMOHIRO (JP)
HIGASHIDA YASUTO (JP)
HIDAKA YASUYOSHI (JP)

Application Number:

PCT/JP2013/001856

Publication Date:

October 31, 2013

Filing Date:

March 19, 2013

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

B21B25/00; B21B19/04; C23C4/02; C23C4/08; C23C4/10; C23C4/12

Domestic Patent References:

WO2009057471A1	2009-05-07
WO2010100968A1	2010-09-10

Foreign References:

JPS5913924B2	1984-04-02
JPH03281770A	1991-12-12
JPH04120260A	1992-04-21
JP4279350B1	2009-06-17

Other References: