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Title:
CENTRIFUGALLY CAST COMPOSITE ROLL FOR HOT ROLLING
Document Type and Number:
WIPO Patent Application WO/2015/045985
Kind Code:
A1
Abstract:
Provided is a centrifugally cast composite roll for hot rolling in which: an outer layer (1) that is formed by centrifugal casting and an inner layer (2) comprising a ductile cast iron are integrated by welding; the outer layer has a chemical composition that includes, by mass, 1.6-3% of C, 0.3-2.5% of Si, 0.3-2.5% of Mn, 0.1-5% of Ni, 2.8-7% of Cr, 1.8-6% of Mo, 3.3-6.5% of V, 0.02-0.12% of B (or 0.01-0.12% of B and 0.05-0.2% of S), and a remainder of Fe and unavoidable impurities; the relationship that is represented by Cr /(Mo + 0.5W) ≥ -2/3[C - 0.2(V + 1.19Nb)] + 11/6 (wherein W = 0 and Nb = 0 when W and Nb are not included) is satisfied; and 1-15% of an MC carbide, 0.5-20% of a charcoal boride, and 1-25% of an Cr-based carbide by area ratio are included therein.

Inventors:
HATTORI TOSHIYUKI (JP)
ODA NOZOMU (JP)
NOZAKI YASUNORI (JP)
Application Number:
PCT/JP2014/074565
Publication Date:
April 02, 2015
Filing Date:
September 17, 2014
Export Citation:
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Assignee:
HITACHI METALS LTD (JP)
International Classes:
B21B27/02; B22D13/02; C22C37/00; C22C37/04; C22C37/08; C22C38/00; C22C38/60
Foreign References:
JP2007245217A2007-09-27
JP2006281301A2006-10-19
JP2004082209A2004-03-18
JPH0820837A1996-01-23
JP2005264322A2005-09-29
JPH108212A1998-01-13
JPS6126758A1986-02-06
Other References:
See also references of EP 3050637A4
Attorney, Agent or Firm:
TAKAISHI Kitsuma (JP)
Kitsuma Takaishi (JP)
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