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:
Oct. 01, 2024
Filed:
Dec. 27, 2019
Nippon Steel Corporation, Tokyo, JP;
Akira Shiga, Tokyo, JP;
Yutaka Neishi, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
There is provided a steel material that has a high critical working ratio in cold forging and has a high fatigue strength and an excellent hydrogen embrittlement resistance when the steel material is formed into a carburized-steel component. The steel material according to the present embodiment has a chemical composition that contains, in mass %, C: 0.07 to 0.13%, Si: 0.15 to 0.35%, Mn: 0.60 to 0.80%, S: 0.005 to 0.050%, Cr: 1.90 to 2.50%, B: 0.0005 to 0.0100%, Ti: 0.010 to less than 0.050%, Al: 0.010 to 0.100%, Ca: 0.0002% to 0.0030%, N: 0.0080% or less, P: 0.050% or less, and O: 0.0030% or less, with the balance being Fe and impurities, and satisfies Formula (1) to Formula (5) described in the specification.