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US 11,389,847 B2Granted
Centrifugally cast composite roll for rolling and its production method
AssigneeHitachi Metals, Ltd.
InventorsYasunori Nozaki, Nozomu Oda
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Abstract
A centrifugally cast composite roll for rolling comprising an outer layer and an inner layer, which are integrally fused to each other, the outer layer being made of an Fe-based alloy comprising by mass 1.70-2.70% of C, 0.3-3% of Si, 0.1-3% of Mn, 1.1-3.0% of Ni, 4.0-10% of Cr, 2.0-7.5% of Mo, 3-6.0% of V, 0.1-2% of W, 0.2-2% of Nb, 0.01-0.2% of B, and 0.01-0.1% of N, the balance being Fe and inevitable impurities, and the inner layer being made of ductile cast iron.
Claims4
A centrifugally cast composite roll for rolling comprising an outer layer and inner layer, which are integrally fused to each other;
- said outer layer being made of an Fe-based alloy comprising by mass 1.70-2.70% of C, 0.3-3% of Si, 0.1-3% of Mn, 1.1-3.0% of Ni, 4.0-10% of Cr, 2.0-7.5% of Mo, 3-6.0% of V, 0.1-2% of W, 0.2-2% of Nb, 0.01-0.2% of B, and 0.01-0.1% of N, the balance being Fe and inevitable impurities;
- and
- said inner layer being made of ductile cast iron,
- wherein said outer layer has circumferential residual compressive stress of 150-350 MPa at a discard diameter and Shore hardness of 70-90 at an initial diameter.
1 more element
Dependencies are inferred from the claim text.