Title:
高周波焼入用の機械構造用鋼及び高周波焼入鋼部品
Document Type and Number:
Japanese Patent JP6652019
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a steel for machine structural use for induction hardening excellent in machinability, and excellent in surface fatigue strength after being induction-hardened, and an induction-hardened steel component excellent in surface fatigue strength.SOLUTION: The steel for machine structural use for induction hardening is adopted that has a chemical composition containing C:0.40 to 0.70%, Si:0.15 to 3.00%, Mn:0.30 to 2.00%, Cr:0.01 to less than 0.50%, S:0.003 to 0.070%, Bi:over 0.0001 to 0.0050%, Sn:0.0001 to 0.0050%, Bi and Sn:0.0002 to 0.0050% in total, N:0.0030 to 0.0075%, Al:0.003 to 0.100%, and P:less than 0.050, and the balance Fe with inevitable impurities, and satisfying the formula (1) and the formula (2). The steel has an existing density of Mn with an equivalent circle diameter of less than 2 μm in a cross section in parallel to a rolling direction of a steel material of 300/mmor more. 290C+50Si+430≥620...(1). d+3σ<20...(2).SELECTED DRAWING: None
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Inventors:
Miyanishi Kei
Satoshi Shiga
Yutaka Neishi
Taku Yoshida
Shinya Teramoto
Satoshi Shiga
Yutaka Neishi
Taku Yoshida
Shinya Teramoto
Application Number:
JP2016170791A
Publication Date:
February 19, 2020
Filing Date:
September 01, 2016
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; C22C38/60
Domestic Patent References:
| JP2008075177A |
Foreign References:
| KR1020140002260A | ||||
| KR1020120070735A |
Attorney, Agent or Firm:
Sumio Tanai
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi
Masatake Shiga
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi
Masatake Shiga