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Title:
Cr-PLATED MADNREL BAR FOR MANUFACTURING HOT SEAMLESS TUBE AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/2004/108311
Kind Code:
A1
Abstract:
A Cr-plated mandrel bar for manufacturing a hot seamless tube and a method of manufacturing the mandrel bar, the mandrel bar wherein since the maximum depths (Rv) thereof in the axial and circumferential directions are specified together with average centerline roughnesses (Ra) in the axial and circumferential directions and the maximum heights (Rp) in the axial and circumferential directions are limited, seizure and other surface defect is hard to occur on the mandrel bar during the drawing of a mandrel mill to remarkably increase the useful life thereof so as to remarkably reduce tool cost. Also, the mandrel bar can largely contribute to the improvement in quality of the inner surface of the hot seamless tube rolled by the mandrel mill. The method can efficiently manufacture the Cr-plated mandrel bar for manufacturing the hot seamless tube.

Inventors:
IIDA SUMIO (JP)
ANRAKU TOSHIRO (JP)
IMAMURA MASAMI (JP)
HORI HIROFUMI (JP)
Application Number:
PCT/JP2004/007685
Publication Date:
December 16, 2004
Filing Date:
June 03, 2004
Export Citation:
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Assignee:
SUMITOMO METAL IND (JP)
IIDA SUMIO (JP)
ANRAKU TOSHIRO (JP)
IMAMURA MASAMI (JP)
HORI HIROFUMI (JP)
International Classes:
B21B25/00; (IPC1-7): B21B25/00
Foreign References:
JPH08164404A1996-06-25
JPH0871618A1996-03-19
JPH11226614A1999-08-24
JP2000351007A2000-12-19
Other References:
See also references of EP 1637245A4
Attorney, Agent or Firm:
Mori, Michio (Amagasaki Building 17-23, Higashinaniwa-cho 5-chom, Amagasaki-shi Hyogo 92, JP)
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