Mandrel bar for high-alloy rolling, method for surface...

Details Mandrel bar for high-alloy rolling, method for surface... Mandrel bar for high-alloy rolling, method for surface...

2008-09-24

2011-11-29

Tolan, Edward (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

With tool inside hollow work

C072S364000, C072S462000, C072S700000

Reexamination Certificate

active

08065901

ABSTRACT:
A method for surface treating a mandrel bar used for hot rolling of high-alloy seamless steel pipe is provided. The method includes heat treating the mandrel bar to develop a scale, and after heat treatment, rolling ordinary steel comprising 8% or less of chromium for at least 50 passes. This achieves a mandrel bar for rolling high-alloy steel possessing both durability and superior resistance to seizure.

REFERENCES:
patent: 4827750 (1989-05-01), Hayashi
patent: 4886640 (1989-12-01), Garner et al.
patent: 5218851 (1993-06-01), Imae
patent: 6267828 (2001-07-01), Kushida et al.
patent: 7100410 (2006-09-01), Yamakawa et al.
patent: 7165431 (2007-01-01), Iida et al.
patent: 2008/0047317 (2008-02-01), Sasaki
patent: 54-17363 (1979-02-01), None
patent: 57-103714 (1982-06-01), None
patent: 63-235491 (1988-09-01), None
patent: 01-170502 (1989-07-01), None
patent: 3-240921 (1991-10-01), None
patent: 06-262220 (1994-09-01), None
patent: 06-339709 (1994-12-01), None
patent: 8-164404 (1996-06-01), None
patent: 8-197112 (1996-08-01), None
patent: 11-226614 (1999-08-01), None
patent: 2000-246312 (2000-09-01), None
patent: 2000-351007 (2000-12-01), None
patent: 2001-1016 (2001-01-01), None
patent: 2004-344923 (2004-12-01), None
International Search Report in corresponding PCT/JP2007/056676 dated Jun. 19, 2007.
Written Opinion in corresponding PCT/JP2007/056676 dated Jun. 19, 2007 (Japanese).
International Preliminary Report on Patentability from the International Bureau of WIPO, dated Oct. 21, 2008.

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