Composite rolling mill roll and rolling method
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsTsuyoshi Inoue, Shigeru Uchida, Seiji Ito
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Abstract
A composite rolling mill roll according to the present invention includes: a steel roll shaft; and an outer layer provided around the roll shaft, in which the outer layer includes a sintered body including a base metal which is an iron alloy, a fibrous inclusion which consists of a ceramic and has an average diameter of 1 to 30 μm and an average aspect ratio of 10 to 500, and a particulate inclusion which consists of a ceramic and has an average diameter of powder 1 to 100 μm, an amount of the fibrous inclusion is 5 to 40 volume % relative to the volume of the sintered body, and an amount of the particulate inclusion is 5 to 30 volume % relative to the volume of the sintered body.
Claims15
A composite rolling mill roll comprising:
- a steel roll shaft;
- and
- an outer layer provided around the roll shaft, wherein
- the outer layer includes a sintered body including a base metal which is an iron alloy, a fibrous inclusion which consists of a ceramic and has an average diameter of 1 to 30 μm and an average aspect ratio of 10 to 500, and a particulate inclusion which consists of a ceramic and has an average diameter of 1 to 100 μm,
- an amount of the fibrous inclusion is 5 to 40 volume % relative to a volume of the sintered body, and
- an amount of the particulate inclusion is 5 to 30 volume % relative to the volume of the sintered body.
A composite rolling mill roll comprising:
- a steel roll shaft;
- and
- an outer layer provided around the roll shaft, wherein
- the outer layer includes a sintered body obtained by sintering a mixture of (a) a powder of an iron alloy, (b) a ceramic fiber which has an average diameter of 1 to 30 μm and an average aspect ratio of 10 to 500, and (c) a ceramic powder which has an average diameter of 1 to 100 μm;
- a blending amount of (b) the ceramic fiber before the sintering is 5 to 40 volume % relative to a total amount of (a) the powder of the iron alloy, (b) the ceramic fiber, and (c) the ceramic powder before the sintering;
- a blending amount of (c) the ceramic powder before the sintering is 5 to 30 volume % relative to the total amount of (a) the powder of the iron alloy, (b) the ceramic fiber, and (c) the ceramic powder before the sintering;
- and
- (b) the ceramic fiber and (c) the ceramic powder exist independently after the sintering.
A method for manufacturing a composite rolling mill roll including an outer layer and a roll shaft, the method comprising:
- mixing a powder of an iron alloy, a ceramic powder having an average diameter of 1 to 100 μm, and a ceramic fiber having an average diameter of 1 to 30 μm and an average aspect ratio of 10 to 500 to obtain a raw mixture;
- and
- filling the raw mixture into a tubular capsule installed around the roll shaft, then degassing inside of the capsule, and then sintering the raw mixture by hot isostatic pressing under 70 to 120 MPa of a pressure to obtain the composite rolling mill roll in which the outer layer is joined around the roll shaft;
- wherein
- a blending amount of the ceramic fiber before the sintering is 5 to 40 volume % relative to the total amount of the raw mixture before the sintering;
- and
- a blending amount of the ceramic powder before the sintering is 5 to 30 volume % relative to the total amount of the raw mixture before the sintering.
Dependencies are inferred from the claim text.