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Title:
ROLL FOR HOT-ROLLING APPARATUS AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2011/151929
Kind Code:
A1
Abstract:
A roll suitable for use in hot-rolling apparatuses is provided at low cost, the roll comprising a roll base which has a high hardness and is less apt to suffer deformation damages such as dents and a coating film formed on the surface of the roll base by thermal spraying, the coating film having excellent adhesion, wear resistance, and steel-sheet-conveying properties. Also provided is a process for advantageously producing the roll. The surface of a roll base comprising a steel which contains 0.9-3.2 mass% Cr and has a carbon equivalent Ceq, defined by equation (1), of 0.45-1.65 mass% is coated by thermal spraying with a coating film constituted of a self-fluxing alloy containing hard ceramic particles. Thereafter, the coated roll base is subjected to fusing treatment in a non-oxidizing atmosphere to form a diffusion layer having a thickness of 30-200 µm between the coating film formed by thermal spraying and the roll base, and is then cooled or heat-treated. Thus, the roll base is made to have a hardness of 35-60 in terms of Shore hardness HS.

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Inventors:
HONG MYONG SOO (KR)
YASUO NORIYUKI (JP)
MIYAJIMA KIYOSHI (JP)
Application Number:
PCT/JP2010/059577
Publication Date:
December 08, 2011
Filing Date:
May 31, 2010
Export Citation:
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Assignee:
TOCALO CO LTD (JP)
HONG MYONG SOO (KR)
YASUO NORIYUKI (JP)
MIYAJIMA KIYOSHI (JP)
International Classes:
C23C4/06; B21C47/00; B21C47/06; C22C38/00; C22C38/22; C22C38/24; C23C4/10; C23C4/12; C23C4/18; C23C10/28; C23C26/00
Foreign References:
JP2008291300A2008-12-04
JP2000282216A2000-10-10
JPS5713166A1982-01-23
JPH02197554A1990-08-06
JP2003334691A2003-11-25
JPH0586453A1993-04-06
Attorney, Agent or Firm:
OGAWA, Junzo et al. (JP)
Brook Junzo (JP)
Download PDF:
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Claims:



 
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