Title:
MANUFACTURING METHOD FOR PIERCING PLUG
Document Type and Number:
WIPO Patent Application WO/2013/183213
Kind Code:
A1
Abstract:
This manufacturing method for a piercing plug used in a piercing mill for manufacturing a seamless steel pipe includes a shot blasting step wherein shot blasting is applied to the plug surface and an arc spraying step wherein a thermal spraying wire is arc-sprayed onto the surface of base material of the shot-blasted plug in order to form a coating thereon. In the arc spraying step, the arc spraying is carried out by using a cored wire (1), which is produced by filling an iron tube (2) with iron particles (4) and at least low-thermal-conductivity material particles (3) that are selected from among low-thermal-conductivity material particles (3) having lower thermal conductivity characteristics than that of iron oxide(for example, ZrO2 particles), in order to form a coating comprising iron oxide, Fe, and the low-thermal-conductivity material. Because a coating with high heat-insulating performance can be formed, a plug that allows the plug life to be improved for the piercing process can be manufactured.
Inventors:
SAITOU KENICHI (JP)
HIDAKA YASUYOSHI (JP)
HIGASHIDA YASUTO (JP)
HIDAKA YASUYOSHI (JP)
HIGASHIDA YASUTO (JP)
Application Number:
PCT/JP2013/002657
Publication Date:
December 12, 2013
Filing Date:
April 19, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C23C4/04; B21B19/04; B21B25/00; C23C4/02
Domestic Patent References:
| WO2009057471A1 | 2009-05-07 |
Foreign References:
| JPS5913924B2 | 1984-04-02 | |||
| JP4279350B1 | 2009-06-17 |
Other References:
See also references of EP 2857545A4
Attorney, Agent or Firm:
M. MORI PATENT FIRM (JP)
Patent business corporation Woods Michio patent firm (JP)
Patent business corporation Woods Michio patent firm (JP)
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