Title:
機械構造用鋼部品およびその製造方法
Document Type and Number:
Japanese Patent JP5152440
Kind Code:
B2
Abstract:
The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: 0.05 to 0.20%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 μm or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more.
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Inventors:
Shinya Teramoto
Keisuke Takada
Manabu Kubota
Keisuke Takada
Manabu Kubota
Application Number:
JP2012538120A
Publication Date:
February 27, 2013
Filing Date:
May 25, 2012
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
C22C38/00; B21J1/06; C21D8/00; C22C38/60
Domestic Patent References:
| JPH01116032A | 1989-05-09 | |||
| JPH073385A | 1995-01-06 | |||
| JPH0688162A | 1994-03-29 | |||
| JP2004169055A | 2004-06-17 | |||
| JPH06306460A | 1994-11-01 | |||
| JP2003147479A | 2003-05-21 |
Other References:
JPN6012056210; 高田啓督、子安善郎: 'ベイナイト型熱鍛非調質鋼の組織と機械的性質' 材料とプロセス Ｖｏｌ．５ Ｎｏ．６, 199209, Ｐａｇｅ．１９０２
Attorney, Agent or Firm:
Koji Hagiwara
Tetsuo Kanamoto
Miaki Kametani
Tetsuo Kanamoto
Miaki Kametani