Title:
機械構造用鋼及び高周波焼入鋼部品
Document Type and Number:
Japanese Patent JP6521089
Kind Code:
B2
Abstract:
There is provided a steel for machine structural use including, as a chemical composition, by mass%, C: 0.40% to 0.70%, Si: 0.15% to 3.00%, Mn: 0.30% to 2.00%, Cr: 0.01% or more and less than 0.50%, S: 0.003% to 0.070%, Bi: more than 0.0001% and 0.0050% or less, N: 0.0030% to 0.0075%, Al: 0.003% to 0.100%, and P: 0.050% or less; and as necessary, B, Mo, Ni, Cu, Ca, Mg, Zr, Rem, Ti, Nb, V, Sb, Te, and Pb, a remainder including Fe and impurities, in which Expressions 290×C+50×Si+430‰¥620 and d+3Ã<20 are satisfied, and a presence density of MnS having an equivalent circle diameter of smaller than 2.0 µm is 300 pieces/mm 2 or more in a cross section parallel to a longitudinal direction.
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Inventors:
Miyanishi Kei
Satoshi Shiga
Hajime Hasegawa
Hideo Mizukami
Satoshi Shiga
Hajime Hasegawa
Hideo Mizukami
Application Number:
JP2017546532A
Publication Date:
May 29, 2019
Filing Date:
October 14, 2016
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; C22C38/60
Domestic Patent References:
| JP2003293081A | ||||
| JP2005154886A | ||||
| JP1129952A | ||||
| JP10296396A |
Foreign References:
| WO2012008405A1 |
Attorney, Agent or Firm:
Sumio Tanai
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi