Centrifugally cast composite roll for hot rolling and its production method
AssigneeHitachi Metals, Ltd.
InventorsNozomu Oda, Yasunori Nozaki, Ryouta Honda, Takumi Ohata
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Abstract
A centrifugally cast composite roll for hot rolling comprising an outer layer having a composition comprising by mass 0.8-3.5% of C, 0.1-2.5% of Si, 0.1-2.5% of Mn, 1.2-15% of Cr, 1-5% of Ni, and 1-10% of Mo+0.5×W, the balance being substantially Fe and inevitable impurities, and an inner layer made of an iron-based alloy and integrally fused to the outer layer; the outer layer having Shore hardness of 67-82 at the initial diameter of the composite roll; and the maximum Shore hardness of the outer layer in a range 30 mm or more deep from the initial diameter being higher by 1 or more than the Shore hardness of the outer layer at the initial diameter.
Claims13
A centrifugally cast composite roll for hot rolling comprising an outer layer having a composition comprising by mass 0.8-3.5% of C, 0.1-2.5% of Si, 0.1-2.5% of Mn, 1.2-15% of Cr, 1-5% of Ni, and 2.53-10% of Mo+0.5×W, the balance being substantially Fe and inevitable impurities, and an inner layer made of an iron-based alloy and integrally fused to said outer layer;
- said outer layer having Shore hardness of 67-82 at an initial diameter of said composite roll, the initial diameter being an outer diameter of the composite roll before the composite roll is used for rolling;
- and the maximum Shore hardness of said outer layer in a range 30 mm or more deep from said initial diameter being higher by 1 or more than the Shore hardness of said outer layer at said initial diameter.
Dependencies are inferred from the claim text.