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:
Aug. 29, 2017
Filed:
Aug. 24, 2012
Mototsugu Osaki, Aichi, JP;
Shigeki Ueta, Aichi, JP;
Takashi Tsuyumu, Saitama, JP;
DAIDO STEEL CO., LTD., Aichi, JP;
HONDA MOTOR CO., LTD., Tokyo, JP;
Abstract
The object of the present invention is to provide a heat-resistant steel for exhaust valves, having relatively small Ni content, high mechanical characteristics (for example, tensile strength, fatigue strength, wear resistance and hardness) at high temperature, and excellent oxidation resistance. The present invention provides a heat-resistant steel for exhaust valves, which includes: 0.45≦C<0.60 mass %, 0.30<N<0.50 mass %, 19.0≦Cr<23.0 mass %, 5.0≦Ni<9.0 mass %, 8.5≦Mn<10.0 mass %, 2.5≦Mo<4.0 mass %, 0.01≦Si<0.50 mass %, and 0.01≦Nb<0.30 mass %, with the balance being Fe and unavoidable impurities, in which the steel satisfies 0.02≦Nb/C<0.70 and satisfies 4.5≦Mo/C<8.9.