Title:
HIGH-STRENGTH FREE-CUTTING COPPER ALLOY AND METHOD FOR PRODUCING HIGH-STRENGTH FREE-CUTTING COPPER ALLOY
Document Type and Number:
WIPO Patent Application WO/2019/035225
Kind Code:
A1
Abstract:
This high-strength free-cutting copper alloy comprises 75.4-78.0% Cu, 3.05-3.55% Si, 0.05-0.13% P and 0.005-0.070% Pb, with the remainder comprising Zn and inevitable impurities, wherein the amount of Sn existing as inevitable impurities is at most 0.05%, the amount of Al is at most 0.05%, and the total amount of Sn and Al is at most 0.06%. The composition satisfies the following relationships: 78.0≤f1=Cu+0.8×Si+P+Pb≤80.8; and 60.2≤f2=Cu-4.7×Si-P+0.5×Pb≤61.5. The area percentage (%) of respective constituent phases satisfies the following relationships: 29≤κ≤60; 0≤γ≤0.3; β=0; 0≤μ≤1.0; 98.6≤f3=α+κ; 99.7≤f4=α+κ+γ+μ; 0≤f5=γ+μ≤1.2; and 30≤f6=κ+6×γ1/2+0.5×μ≤62. The long side of the γ phase is at most 25 µm, the long side of the μ phase is at most 20 µm, and the κ phase is present within the α phase.
Inventors:
OISHI KEIICHIRO (JP)
SUZAKI KOUICHI (JP)
GOTO HIROKI (JP)
SUZAKI KOUICHI (JP)
GOTO HIROKI (JP)
Application Number:
PCT/JP2018/006218
Publication Date:
February 21, 2019
Filing Date:
February 21, 2018
Export Citation:
Assignee:
MITSUBISHI SHINDO KK (JP)
International Classes:
C22C9/04; C22F1/08; C22F1/00
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Other References:
GENJIRO MIMAMASAHARU HASEGAWA, JOURNAL OF THE JAPAN COPPER AND BRASS RESEARCH ASSOCIATION, vol. 2, 1963, pages 62 - 77
See also references of EP 3656883A4
See also references of EP 3656883A4
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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