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. 23, 2018
Filed:
Mar. 20, 2017
Nippon Steel & Sumitomo Metal Corporation, Chiyoda-ku, Tokyo, JP;
Yasuhiro Maehara, Tokyo, JP;
Mitsuharu Yonemura, Tokyo, JP;
Takashi Maeda, Tokyo, JP;
Keiji Nakajima, Tokyo, JP;
Tsuneaki Nagamichi, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Chiyoda-Ku, Tokyo, JP;
Abstract
A copper alloy consisting of two or more of Cr, Ti and Zr, and the balance Cu and impurities, in which the relationship between the total number N and the diameter X satisfies the following formula (1). Ag, P, Mg or the like may be included instead of a part of Cu. This copper alloy is obtained by cooling a bloom, a slab, a billet, or a ingot in at least in a temperature range from the bloom, the slab, the billet, or the ingot temperature just after casting to 450° C., at a cooling rate of 0.5° C./s or more. After the cooling, working in a temperature range of 600° C. or lower and further heat treatment of holding for 30 seconds or more in a temperature range of 150 to 750° C. are desirably performed. The working and the heat treatment are desirably performed a plurality of times.log≤0.4742+17.629×exp(−0.1133×)  (1)