The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 2016
Filed:
May. 02, 2014
Applicant:
Hitachi Metals, Ltd., Tokyo, JP;
Inventors:
Assignee:
HITACHI METALS, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 15/01 (2006.01); B21B 27/02 (2006.01); B32B 1/00 (2006.01); C22C 37/08 (2006.01); C22C 37/10 (2006.01); C22C 38/56 (2006.01); C22C 38/54 (2006.01); C22C 38/52 (2006.01); C22C 38/50 (2006.01); C22C 38/48 (2006.01); C22C 38/46 (2006.01); C22C 38/44 (2006.01); C22C 38/34 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); B21B 27/00 (2006.01); C22C 37/00 (2006.01); C22C 37/04 (2006.01); B22D 19/16 (2006.01); B21B 27/03 (2006.01); B22D 13/00 (2006.01);
U.S. Cl.
CPC ...
B32B 15/011 (2013.01); B21B 27/00 (2013.01); B21B 27/021 (2013.01); B22D 19/16 (2013.01); B32B 1/00 (2013.01); C22C 37/00 (2013.01); C22C 37/04 (2013.01); C22C 37/08 (2013.01); C22C 37/10 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/34 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); C22C 38/54 (2013.01); C22C 38/56 (2013.01); B21B 27/032 (2013.01); B22D 13/00 (2013.01); B32B 2307/536 (2013.01); B32B 2307/558 (2013.01); C21D 2211/006 (2013.01);
Abstract
A centrifugally cast hot-rolling composite roll comprising (a) an outer layer made of cast iron having a chemical composition comprising by mass 2.5-3.5% of C, 1.3-2.4% of Si, 0.2-1.5% of Mn, 3.5-5.0% of Ni, 0.8-1.5% of Cr, 2.5-5.0% of Mo, 1.8-4.0% of V, and 0.2-1.5% of Nb, the balance being Fe and inevitable impurities, a mass ratio of Nb/V being 0.1-0.7, and a mass ratio of Mo/V being 0.7-2.5, and meeting the condition of 2.5≦V+1.2Nb≦5.5, and having a structure comprising 0.3-10% by area of a graphite phase; (b) a shaft portion made of ductile cast iron in which the area ratio of ferrite is 35% or less; and (c) an intermediate cast iron layer.