Title:
鋼板部材の製造方法
Document Type and Number:
Japanese Patent JP7184022
Kind Code:
B2
Abstract:
A method for producing a steel plate member (SPM) (10), including: a quenching step for heating the SPM to a temperature higher than an austenite transformation finish temperature A3 and subsequently cooling the SPM at a cooling rate (CR) faster than an upper critical CR; and a tempering step for reheating a second region (12) of the SPM to a temperature higher than an austenite transformation start temperature A1 without reheating a first region (11) of the SPM after quenching and subsequently cooling the SPM at a CR slower than a lower critical CR. In the cooling process of the tempering step, the shape of the second region is corrected in a temperature range from a temperature equal to or lower than A1 to a temperature equal to or higher than a temperature at which transformation into ferrite and pearlite is finished while maintaining the CR slower than the lower critical CR.
Inventors:
Shoji Kawano
Shinya Yamamoto
Masanori Niihara
Tomoaki Ihara
Shinya Yamamoto
Masanori Niihara
Tomoaki Ihara
Application Number:
JP2019208054A
Publication Date:
December 06, 2022
Filing Date:
November 18, 2019
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
C21D9/00; B21D3/10; C21D1/18; C21D1/42
Domestic Patent References:
| JP2019108601A |
Foreign References:
| US5885522 |
Attorney, Agent or Firm:
Ken Ieiri