Title:
STEEL FOR MACHINE STRUCTURAL USE
Document Type and Number:
Japanese Patent JP3912308
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide inexpensive steel for machine structural use which does not substantially comprise Pb and has excellent machinability, and in which the anisotropy of mechanical properties is reduced.
SOLUTION: The steel for machine structural use has a chemical composition comprising 0.1 to 0.6% C, 0.03 to 2.0% Si, 0.2 to 2.0% Mn, 0.03 to 0.20% S, ≤0.1% P, 0.001 to 0.02% N, 0.0003 to 0.005% Al, 0.0001 to 0.01% Ca, 0.0005 to 0.005% O, and 0.0001 to 0.01% Te, and the balance Fe with impurities, and in which the content of Mg in the impurities is controlled to ≤0.001%, and comprises MnS-based inclusions including 0.1 to 0.6 atomic% Te and having a shape in which the width W is ≥2μm, and also, the ratio between the length L and the width W, L/W is ≤5 in the longitudinally vertical section. The steel can further comprise one or more kinds of metals selected from Ti, Cr, V, Mo, Nb, Cu, and Ni or/and one or more kinds of metals selected from Bi and REMs (rare earth metals).
Inventors:
Takayuki Nishi
Toru Kato
Hiroaki Tahira
Koji Watari
Naoki Matsui
Hitoshi Matsumoto
Toru Kato
Hiroaki Tahira
Koji Watari
Naoki Matsui
Hitoshi Matsumoto
Application Number:
JP2003089959A
Publication Date:
May 09, 2007
Filing Date:
March 28, 2003
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
C22C38/00; C22C38/06; C22C38/60; (IPC1-7): C22C38/00; C22C38/06; C22C38/60
Domestic Patent References:
| JP55141549A | ||||
| JP2001040452A | ||||
| JP55141550A | ||||
| JP55138064A | ||||
| JP59173250A |
Attorney, Agent or Firm:
Terutada Hogami
Mikiji Sugioka
Mikiji Sugioka