Title:
CAST IRON-MADE CYLINDRICAL MEMBER AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
Japanese Patent JP2023001684
Kind Code:
A
Abstract:
To provide a cast iron-made cylindrical member that allows for increased strength while ensuring high slidability of the inner peripheral part and a method for producing the same.SOLUTION: To a molten metal that contains C: 3.5-3.85%, Si: 2.3-2.7%, Mn: 0.5-1.5%, and S: 0.005-0.015% with the balance being Fe and has a CE value of 4.45-4.70, added are a graphite spheroidizing agent containing Mg: 2.0-4.0% and RE: 4.0-6.0% and an Fe-Si-Bi inoculating agent; the molten metal is injected into a die for centrifugal casting; and a first cooling is performed to cool the temperature at injection to an eutectic temperature and then a second cooling is performed to cool the eutectic temperature to an eutectoid temperature at a cooling rate lower than in the first cooling. Thus, a cast iron-made cylindrical member can be produced in which granular or spherical graphite particles of less than 50 μm exist by 1000 or more per mm2; the number of graphite particles increases toward the inner peripheral face of the member; the graphite area ratio is 5% or more; and the graphite area ratio increases toward the inner peripheral face of the member.SELECTED DRAWING: Figure 12
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Inventors:
SUZUKI NOBUAKI
NAGASAWA RYO
MIZUMURA YUICHI
NAGASAWA RYO
MIZUMURA YUICHI
Application Number:
JP2021102555A
Publication Date:
January 06, 2023
Filing Date:
June 21, 2021
Export Citation:
Assignee:
SUZUKI MOTOR CORP
International Classes:
C22C37/04; B22D1/00; B22D5/00; B22D13/02; B22D27/04; C22C33/08
Attorney, Agent or Firm:
Okuyama Shoichi
Tetsuo Matsushima
Nakamura Ayako
Soji Morimoto
Yu Tanaka
Kohei Arihara
Tetsuo Matsushima
Nakamura Ayako
Soji Morimoto
Yu Tanaka
Kohei Arihara