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Title:
CENTRIFUGALLY CAST COMPOSITE ROLL FOR ROLLING AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2020/203571
Kind Code:
A1
Abstract:
Provided is a centrifugally cast composite roll for rolling that has superior resistance to wear and surface roughening comparable to that of a high-speed steel cast iron roll, and has resistance to accidents comparable to that of a high alloy grain cast iron roll. This centrifugally cast composite roll for rolling has an outer layer and an inner layer. The outer layer has a chemical composition by mass ratio of 1.0-3.0% C, 0.3-3.0% Si, 0.1-3.0% Mn, 0.1-6.0% Ni, 0.5-6.0% Cr, 0.5-6.0% Mo, 3.0-7.0% V, 0.1-3.0% Nb, 0.001-0.1% B, and 0.005-0.070% N, with the remainder being Fe and unavoidable impurities, the chemical composition of the outer layer satisfies formula (1), the crystal deposition amount of graphite by area ratio is suppressed to less than 0.3%, MC-type carbide is present in the amount of 1-15% by area ratio, and at the boundary of the outer layer and the inner layer no casting defects with a diameter φ of 4mm or greater are present. 50 × N + V < 9.0... (1)

Inventors:
KAMIMIYADA KAZUNORI (JP)
ISHIKAWA SHINYA (JP)
YANAGITSURU AYAKA (JP)
Application Number:
PCT/JP2020/013400
Publication Date:
October 08, 2020
Filing Date:
March 25, 2020
Export Citation:
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Assignee:
NIPPON STEEL ROLLS CORP (JP)
International Classes:
B21B27/00; B22D13/02; C21D5/00; C21D9/38; C22C37/00; C22C38/00; C22C38/58; C22C38/60
Domestic Patent References:
WO2015045720A12015-04-02
WO2018147370A12018-08-16
Foreign References:
JP2012117083A2012-06-21
JP2001321807A2001-11-20
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
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