Invention Grant
- Patent Title: Centrifugally cast composite roll for rolling and method of manufacturing the same
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Application No.: US17600794Application Date: 2020-03-25
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Publication No.: US11628481B2Publication Date: 2023-04-18
- Inventor: Kazunori Kamimiyada , Shinya Ishikawa , Yuji Konno
- Applicant: NIPPON STEEL ROLLS CORPORATION
- Applicant Address: JP Kitakyushu
- Assignee: NIPPON STEEL ROLLS CORPORATION
- Current Assignee: NIPPON STEEL ROLLS CORPORATION
- Current Assignee Address: JP Kitakyushu
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPJP2019-071305 20190403
- International Application: PCT/JP2020/013399 WO 20200325
- International Announcement: WO2020/203570 WO 20201008
- Main IPC: B21B27/02
- IPC: B21B27/02 ; C21D5/00 ; C21D9/38 ; C22C37/08 ; C22C37/10

Abstract:
There is provided a centrifugally cast composite roll for rolling having excellent wear resistance and surface deterioration resistance at levels of a high-speed steel cast iron roll and having rolling incident resistance at a level of a high alloy grain cast iron roll. Its outer layer includes chemical components by mass ratio: C: 1.5 to 3.5%; Si: 0.3 to 3.0%; Mn: 0.1 to 3.0%; Ni: 1.0 to 6.0%; Cr: 1.5 to 6.0%; Mo: 0.1 to 2.5%; V: 2.0 to 6.0%; Nb: 0.1 to 3.0%; B: 0.001 to 0.2%; N: 0.005 to 0.070%; and the balance being Fe and inevitable impurities, wherein: a chemical composition of the outer layer satisfies Formula (1) and has 5 to 30% of M3C carbide by area ratio; an outer layer Shore hardness (A) of a roll surface satisfies Formula (2); and a residual stress (B) of the roll surface satisfies Formula (3), 2×Ni+0.5×Cr+Mo>10.0 (1) Hs 75≤A≤Hs 85 (2) 100 MPa≤B≤350 MPa (3).
Public/Granted literature
- US20220176431A1 CENTRIFUGALLY CAST COMPOSITE ROLL FOR ROLLING AND METHOD OF MANUFACTURING THE SAME Public/Granted day:2022-06-09
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