The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 2015
Filed:
Jun. 01, 2010
Takehiro Tsuchida, Kobe, JP;
Tomokazu Masuda, Kobe, JP;
Masaki Shimamoto, Kobe, JP;
Mutsuhisa Nagahama, Kobe, JP;
Takehiro Tsuchida, Kobe, JP;
Tomokazu Masuda, Kobe, JP;
Masaki Shimamoto, Kobe, JP;
Mutsuhisa Nagahama, Kobe, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
Provided is a steel for machine structural use which has excellent machinability (particularly, with respect to tool life) for both intermittent cutting with a high-speed steel tool and continuous cutting with a cemented carbide tool while maintaining strength properties required of the steel for machine structural use. Specifically, the steel for machine structural use contains C: 0.05-0.9 mass %, Si: 0.03-2 mass %, Mn: 0.2-1.8 mass %, P: 0.03 mass % or less, S: 0.03 mass % or less, Al: 0.1-0.5 mass %, N: 0.002-0.017 mass %, and O: 0.003 mass % or less, and contains one or more selected from a group consisting of Ti: 0.05 mass % or less (excluding 0 mass %) and B: 0.008 mass % or less (excluding 0 mass %), with the remainder being iron and unavoidable impurities, and satisfies all of the following inequalities (1)-(3) below: (1): [N]−0.3[Ti]−1.4[B]<(0.0004/[Al])−0.002; (2): [Ti]−[N]/0.3<0.005; and (3): [B]−([N]−0.3[Ti])/1.4<0.003 when [Ti]−[N]/0.3<0 and [B]<0.003 when [Ti]−[N]/0.3≧0.