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. 15, 2013
Filed:
Oct. 04, 2006
Nao Yoshihara, Kobe, JP;
Nao Yoshihara, Kobe, JP;
Kabushiki Kaisha Kobe Seiko Sho, Kobe-shi, JP;
Abstract
Disclosed is a spring steel, containing: C: 0.35-0.65% (the term '%' herein means 'mass %', the same is true hereinbelow), Si: 1.5-2.5%, Mn: 0.05-1%, Cr: 0.05-1.9%, P: 0.015% or less (exclusive of 0%), S: 0.015% or less (exclusive of 0%), Ti: 0.025-0.1%, Al: 0.05% or less (exclusive of 0%), and N: 0.01% or less (exclusive of 0%), wherein an amount of Ti nitride, an amount of Ti sulfide, and an amount of Ti carbide satisfy the following formulas (1), (2), and (3);[Ti]≧3.42×[N]−0.354×[Al]−0.103×[Nb]  (1)[Ti]≧1.49×[S]  (2)[Ti]≧0.015   (3),in which [Ti] represents the amount of Ti (mass %) forming Ti nitride, [Ti] represents the amount of Ti (mass %) forming Ti sulfide, [Ti] represents the amount of Ti (mass %) forming Ti carbide, and [N], [Al], [Nb], and [S] represent an amount (mass %) of each element in the steel. The spring steel of the present invention shows excellent resistance to hydrogen embrittlement.