Title:
CRANKSHAFT,AND METHOD FOR MANUFACTURING ROUGH-SHAPE MATERIAL FOR CRANKSHAFT
Document Type and Number:
WIPO Patent Application WO/2021/090799
Kind Code:
A1
Abstract:
Provided is a crankshaft that has exceptional fatigue strength and machinability. The crankshaft has a pin and a journal, the crankshaft being such that: the chemical composition thereof includes, in terms of mass%, 0.40-0.60% of C, 0.01-1.50% of Si, 0.4-2.0% of Mn, 0.01-0.50% of Cr, 0.20-0.50% of Al, 0.001-0.02% of N, 0.03% or less of P, 0.005-0.20% of S, 0.005-0.060% of Nb, and 0-0.060% of Ti, the balance being Fe and impurities; in each of the pin and the journal, the hardness at positions that are at a depth of 1/4 of the respective diameters from the surfaces is greater than HV 245; and the composition at these positions is mainly composed of ferrite/pearlite, the proportion of ferrite being 16% or higher.
More Like This:
| JPS642754 | HOT FORGING DIE |
Inventors:
KUBOTA MANABU (JP)
MAEJIMA TAKETO (JP)
MAEJIMA TAKETO (JP)
Application Number:
PCT/JP2020/041041
Publication Date:
May 14, 2021
Filing Date:
November 02, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21J1/06; B21J5/00; B21K1/08; C21D8/00; C21D9/30; C22C38/00; C22C38/38; F16C3/06
Domestic Patent References:
| WO2019203348A1 | 2019-10-24 |
Foreign References:
| JP2012219335A | 2012-11-12 | |||
| JP2010242123A | 2010-10-28 |
Attorney, Agent or Firm:
UEBA, Hidetoshi et al. (JP)
Download PDF: