The present invention provides a composite roll for rolling including an outer layer having excellent wear resistance, surface roughening resistance, crack resistance, and accident resistance due to segregation of MC carbides being suppressed to adjust the amount of graphite to be crystallized. The composite roll for rolling of the present invention is a composite roll for rolling that has an outer layer and is produced through centrifugal casting, and the outer layer contains C in an amount of 2.2 mass % to 3.2 mass %, Si in an amount of 1.0 mass % to 3.0 mass %, Mn in an amount of 0.3 mass % to 2.0 mass %, Ni in an amount of 3.0 mass % to 7.0 mass %, Cr in an amount of 0.5 mass % to 2.5 mass %, Mo in an amount of 1.0 mass % to 3.0 mass %, V in an amount of 2.5 mass % to 5.0 mass %, Nb in an amount of more than 0 mass % and 0.5 mass % or less, and a remaining portion including Fe and inevitable impurities, and a condition (a): Nb mass %/V mass %<0.1, and a condition (b): 2.1C mass %+1.2Si mass %Cr mass %+0.5Mo mass %+(V mass %+Nb mass %/2)13.0 mass % are satisfied.

A compound roll includes a sintered inner core of a first cemented carbide and at least one sintered outer sleeve of a second cemented carbide disposed around the inner core. The outer sleeve and inner core each have a joining surface, wherein when the inner core and outer sleeve are assembled each joining surface contact to form a bonding interface therebetween. When the assembled, sintered inner core and outer sleeve are heated to a predetermined temperature the sintered inner core and outer sleeve are fused together at the bonding interface to form the unitary compound roll. To reduce the overall cost of the compound roll, a lower cost cemented carbide, or a cemented carbide with a lower density can be used for the inner core and fused to an outer sleeve of a virgin cemented carbide, thereby reducing the powder cost and/or reducing the overall mass of the compound roll.

A compound roll includes a sintered inner core of a first cemented carbide and at least one sintered outer sleeve of a second cemented carbide disposed around the inner core. The outer sleeve and inner core each have a joining surface, wherein when the inner core and outer sleeve are assembled each joining surface contact to form a bonding interface therebetween. When the assembled, sintered inner core and outer sleeve are heated to a predetermined temperature the sintered inner core and outer sleeve are fused together at the bonding interface to form the unitary compound roll. To reduce the overall cost of the compound roll, a lower cost cemented carbide, or a cemented carbide with a lower density can be used for the inner core and fused to an outer sleeve of a virgin cemented carbide, thereby reducing the powder cost and/or reducing the overall mass of the compound roll.

A rolling mill roll according to the present invention includes: a shaft member which rotates around an axial line; a rolling ring which is fitted to an outer circumferential surface of the shaft member; a support portion which is provided on the outer circumferential surface of the shaft member; an interposed ring which is fitted to the outer circumferential surface of the shaft member and is provided on the other side of the rolling ring in the axial line direction; a pressing nut which is screwed onto the outer circumferential surface of the shaft member and is disposed to be adjacent to the other side of the interposed ring; a screw hole which is formed to penetrate the pressing nut in the axial line direction; and a screw shaft which is screwed into the screw hole and which is capable of pressing the interposed ring toward the one side in the axial line direction.

A cemented carbide comprising 55-90 parts by mass of WC particles, and 10-45 parts by mass of an Fe-based binder phase, the binder phase having a composition comprising 2.5-10% by mass of Ni, 0.2-1.2% by mass of C, 0.5-5% by mass of Cr, 0.2-2.0% by mass of Si, 0.1-3% by mass of W, 0-5% by mass of Co, and 0-1% by mass of Mn, the balance being substantially Fe and inevitable impurities, and the cemented carbide being substantially free from composite carbides having major axes of 5 m or more. This cemented carbide is produced by cooling at a cooling rate of 60 C./hour or more between 900 C. and 600 C., after vacuum sintering.

A non-woven covered roller comprising a resin-saturated seamless non-woven tube on a shaft and a process for making the non-woven covered roller comprising non-woven fibers and a shaft surface completely covered with at least the same resin wherein the resin-saturated non-woven tube has a hardness of at least 40 wet Shore A. It also has an outer surface configured to both trap metal debris from a metal web during primary metal fabrication operations and temporarily compress to allow larger metal debris associated with the metal web to pass by without permanently damaging the outer surface of the non-woven covered roller. Furthermore, it has an inner surface sufficiently bonded with the same resin to the outer surface of the shaft to permit satisfactory life of the resin-saturated non-woven covered roller during primary metal fabrication conditions similar to that of conventional shafts that are covered with rubber, urethane, or vinyl, and have not been exposed to the metal debris.

A seamless, embossed or cast substrate is formed using a seamless sleeve having a seamless surface relief formed thereon and configured to slide over an cylindrical base in an embossing or casting assembly. The substrate is a flat web, foil, or film of, for example, paper, polyester, polypropylene, metal or other elongated flat material. The surface relief can be applied through interfering ablation, non-interfering ablation, ink jet printing, or other techniques wherein a seamless surface relief is formed onto the seamless sleeve. A method of making a seamless, embossed or cast substrate includes expanding a diameter of a seamless sleeve having a seamless surface relief formed thereon, sliding the expanded seamless sleeve onto a cylindrical base, allowing the diameter of the seamless sleeve to contract around the cylindrical base, and conveying a substrate through the embossing or casting assembly and embossing or casting the seamless surface relief into the substrate.

[PROBLEM] The invention provides a roll for hot rolling process having various types of more excellent durability performances than conventional rolls, and provides also a method for manufacturing the same.

[SOLUTION] A cladding layer 4 is formed on an outer circumference portion of a roll for hot rolling process 1, where the cladding layer 4 comprises: 0.5 to 0.7% by mass of C, 2.8 to 4.0% by mass of Si, 0.9 to 1.1% by mass of Cu, 1.4 to 1.6% by mass of Mn, 2.7 to 3.3% by mass of Ni, 13.5 to 14.5% by mass of Cr, 0.8 to 1.1% by mass of Mo, 0.9 to 1.1% by mass of Co, and 0.2 to 0.4% by mass of Nb, with a balance being Fe and inevitable impurities, and has a thickness of 5 mm or more.

[PROBLEM] The invention provides a roll for hot rolling process having various types of more excellent durability performances than conventional rolls, and provides also a method for manufacturing the same.

[SOLUTION] A cladding layer 4 is formed on an outer circumference portion of a roll for hot rolling process 1, where the cladding layer 4 comprises: 0.5 to 0.7% by mass of C, 2.8 to 4.0% by mass of Si, 0.9 to 1.1% by mass of Cu, 1.4 to 1.6% by mass of Mn, 2.7 to 3.3% by mass of Ni, 13.5 to 14.5% by mass of Cr, 0.8 to 1.1% by mass of Mo, 0.9 to 1.1% by mass of Co, and 0.2 to 0.4% by mass of Nb, with a balance being Fe and inevitable impurities, and has a thickness of 5 mm or more.

A method for manufacturing a mill roll including a preheating process for joining end portions 16 to 19 of a roll barrel member 13 and/or shaft materials 14, 15, and a friction pressure welding process strongly pressing and joining the shaft materials 14, 15 to a core material 11 after frictionally heating the joining end portions 16 to 19 by rotating the shaft materials 14, 15 while pressing to the core material 11, and a manufacturing apparatus including first and second holding means 29, 23 for the roll barrel member 13 and the shaft materials 14, 15, a rotating means rotating the shaft materials 14, 15, a pressing means 24 pressing the core material 11 and the shaft materials 14, 15 in an axial direction, and a preheating means 31 preheating the joining end portions 16 to 19 of the roll barrel member 13 and the shaft materials 14, 15.