FREE-CUTTING COPPER ALLOY AND METHOD FOR PRODUCING FREE-CUTTING COPPER ALLOY

Title:

FREE-CUTTING COPPER ALLOY AND METHOD FOR PRODUCING FREE-CUTTING COPPER ALLOY

Document Type and Number:

WIPO Patent Application WO/2018/034280

Kind Code:

A1

Abstract:

This free-cutting copper alloy contains more than 77.0% but less than 81.0% Cu, more than 3.4% but less than 4.1% Si, 0.07% to 0.28% Sn, 0.06% to 0.14% P, and more than 0.02% but less than 0.25% Pb, with the remainder being made up of Zn and unavoidable impurities. The composition satisfies the following relations: 1.0 ≤ f0 = 100 × Sn/(Cu + Si + 0.5 × Pb + 0.5 × P – 75.5) ≤ 3.7, 78.5 ≤ f1 = Cu + 0.8 × Si – 8.5 × Sn + P + 0.5 × Pb ≤ 83.0, 61.8 ≤ f2 = Cu – 4.2 × Si – 0.5 × Sn – 2 × P ≤ 63.7. The surface area ratios (%) of the constituent phases satisfy the following relations, 36 ≤ κ ≤ 72, 0 ≤ γ ≤ 2.0, 0 ≤ β ≤ 0.5, 0 ≤ μ ≤ 2.0, 96.5 ≤ f3 = α + κ, 99.4 ≤ f4 = α + κ + γ + μ, 0 ≤ f5 = γ + μ ≤ 3.0, 38 ≤ f6 = κ + 6 × γ1/2 + 0.5 × μ ≤ 80. The long side of the γ phase does not exceed 50 μm, and the long side of the μ phase does not exceed 25 μm.

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Inventors:

OISHI KEIICHIRO (JP)
SUZAKI KOUICHI (JP)
TANAKA SHINJI (JP)
GOTO YOSHIYUKI (JP)

Application Number:

PCT/JP2017/029369

Publication Date:

February 22, 2018

Filing Date:

August 15, 2017

Export Citation:

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Assignee:

MITSUBISHI SHINDO KK (JP)

International Classes:

C22C9/04; C22F1/08; C22F1/00

Domestic Patent References:

WO2015166998A1	2015-11-05
WO2013065830A1	2013-05-10
WO2008081947A1	2008-07-10
WO2007034571A1	2007-03-29
WO2006016442A1	2006-02-16
WO2006016624A1	2006-02-16

Foreign References:

JP2013104071A	2013-05-30
JP2009509031A	2009-03-05
JP2000119774A	2000-04-25
JP2008516081A	2008-05-15
JPH07508560A	1995-09-21
JP2016159238A	2016-09-05
JP2008214760A	2008-09-18
JP2000119775A	2000-04-25
JP2000119774A	2000-04-25
JP2016511792A	2016-04-21
JP2004263301A	2004-09-24
US4055445A	1977-10-25

Other References:

GENJIRO MIMA; MASAHARU HASEGAWA, JOURNAL OF THE JAPAN COPPER AND BRASS RESEARCH ASSOCIATION, vol. 2, 1963, pages 62 - 77
See also references of EP 3498869A4

Attorney, Agent or Firm:

MATSUNUMA Yasushi et al. (JP)

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