Title:
COMPOSITE ROLL FOR ROLLING
Document Type and Number:
Japanese Patent JP3683417
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To secure large surface compressive residual stress in an outer layer by forming an intermediate layer from an adamite type material and making the overall structure of the intermediate layer into a pearlitic structure.
SOLUTION: An intermediate layer is provided to prevent the deterioration in the material of an inner layer due to the intrusion of an alloy in an outer layer at the time of casting. In the case that a high speed steel type cast iron material is used for the outer layer, an adamite material can be suitably used for the intermediate layer in order to maintain high strength even if the large amounts of alloy components are intruded from the outer layer. The adamite material which accelerates the pearlitic transformation of the intermediate layer at the time of hardening of the outer layer and causes neither bainitic transformation nor martensitic transformation, is preferred as the adamite material. As such the adamite material, those having a composition consisting of, by weight, 1.0-2.5% C, 3.1-4.5% Si, 0.2-1.5% Mn, ≤4.0% Ni, ≤4.0% Cr, ≤4.0% Mo, 1.0-2.0% Co, ≤12.0%, in total, of one or more elements among W, V and Nb and the balance substantially Fe can be preferably cited.
Inventors:
Yutaka Tsujimoto
Morikawa
Ryoto Seto
Morikawa
Ryoto Seto
Application Number:
JP23825098A
Publication Date:
August 17, 2005
Filing Date:
August 25, 1998
Export Citation:
Assignee:
Kubota Corporation
International Classes:
B21B27/00; B22D13/02; C22C37/00; C22C37/04; (IPC1-7): C22C37/00; B21B27/00; B22D13/02; C22C37/04
Domestic Patent References:
| JP6256888A | ||||
| JP7001015A |
Attorney, Agent or Firm:
Toshiyuki Maruyama
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