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:
Mar. 18, 2014
Filed:
Oct. 05, 2011
Masayuki Hashimura, Tokyo, JP;
Kei Miyanishi, Tokyo, JP;
Shuji Kozawa, Tokyo, JP;
Manabu Kubota, Tokyo, JP;
Tatsuro Ochi, Tokyo, JP;
Masayuki Hashimura, Tokyo, JP;
Kei Miyanishi, Tokyo, JP;
Shuji Kozawa, Tokyo, JP;
Manabu Kubota, Tokyo, JP;
Tatsuro Ochi, Tokyo, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Abstract
A case hardening steel includes by mass %, C: 0.1% to 0.5%, Si: 0.01% to 1.5%, Mn: 0.3% to 1.8%, S: 0.001% to 0.15%, Cr: 0.4% to 2.0%, Ti: 0.05% to 0.2%, Al: limited to 0.2% or less, N: limited to 0.0050% or less, P: limited to 0.025% or less, O: limited to 0.0025% or less, and the balance of Fe and inevitable impurities, wherein the number d of sulfide having an equivalent circle diameter more than 5 μm per 1 mmand a mass percentage [S] of S satisfy: d≦500×[S]+1.