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:
Jan. 12, 2021
Filed:
Mar. 08, 2017
Aisin Aw Co., Ltd., Anjo, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Koji Obayashi, Toyoake, JP;
Kazuaki Okada, Anjo, JP;
Keisuke Matsuzaka, Okazaki, JP;
Masashi Sakakibara, Handa, JP;
Manabu Kubota, Nishinomiya, JP;
Kei Miyanishi, Kitakyushu, JP;
Tatsuya Koyama, Muroran, JP;
AISIN AW CO., LTD., Anjo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
In this steel component, the concentration of C in a surface layer is 0.85 mass % or more to 1.2 mass % or less, which is higher than the concentration of C in a starting material steel, the surface layer has a volume ratio of a retained-austenite structure higher than 0% and lower than 10%, the remainder of the surface layer is a martensitic structure, the area fraction of grain boundary carbides in the surface layer is lower than 2%, a layer inside the surface layer is higher than the surface layer in a volume ratio of a retained-austenite structure, and in the layer inside the surface layer, the remainder is a martensitic structure.