Title:
浸炭用鍛造材の製造方法
Document Type and Number:
Japanese Patent JP6401143
Kind Code:
B2
Abstract:
A method of producing a carburizing forging material includes heating a steel material at 1300° C. or higher, forming Nb in a solid solution state and then rolling the steel material, heating the rolled steel material in a range of 950 to 1050° C., hot forging the heated steel material in a range of 950 to 1040° C., precipitating a Nb carbonitride in the steel material by cooling the steel material or maintaining a temperature of the steel material under a condition in which a time spent in a range of 950 to 970° C. is 1 minute or longer, precipitating a ferrite phase in the steel material by cooling the steel material or maintaining a temperature of the steel material under a condition in which a time spent in a range of 730 to 870° C. is 10 minutes or longer, and cooling the steel material to room temperature.
Inventors:
Yamanishi Kazuomi
Hiroyuki Inoue
Yuji Adachi
Ken Usami
Hiroyuki Inoue
Yuji Adachi
Ken Usami
Application Number:
JP2015205994A
Publication Date:
October 03, 2018
Filing Date:
October 20, 2015
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
Aichi Steel Co., Ltd.
Aichi Steel Co., Ltd.
International Classes:
C21D8/06; B21J1/06; B21J5/00
Domestic Patent References:
| JP2015160967A | ||||
| JP5533712B2 | ||||
| JP2008189989A | ||||
| JP2008069436A |
Foreign References:
| US20150176100 |
Attorney, Agent or Firm:
Yusuke Hiraki
Sekiya Mitsuo
Ishikawa Takiharu
Yasuhiko Mima
Sekiya Mitsuo
Ishikawa Takiharu
Yasuhiko Mima