Title:
焼入れ鋼管部材及び焼入れ鋼管部材の製造方法
Document Type and Number:
Japanese Patent JP6724452
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a technology of providing part that can be readily processed after hardening a hardened steel pipe member that is produced by hardening with high-frequency induction heating such as 3DQ.SOLUTION: A steel pipe member 20 includes: a hardened tubular body 22; and a recess part 24 brought into a state of being recessed inside relative to the body 22 and having a bottom part 24A with hardness that is lower than hardness of the other parts of the body 22.SELECTED DRAWING: Figure 1
Inventors:
Kazuo Uematsu
Application Number:
JP2016055872A
Publication Date:
July 15, 2020
Filing Date:
March 18, 2016
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B21D17/02; C21D1/18; C21D9/08
Domestic Patent References:
| JP2012517901A | ||||
| JP2008123506A1 | ||||
| JP2003328031A | ||||
| JP201491161A | ||||
| JP2010149184A | ||||
| JP2004502547A |
Foreign References:
| WO2007060905A1 |
Attorney, Agent or Firm:
Patent Service Corporation Taiyo International Patent Office