Title:
FREE-CUTTING COPPER ALLOY CASTING, AND METHOD FOR PRODUCING FREE-CUTTING COPPER ALLOY CASTING
Document Type and Number:
WIPO Patent Application WO/2018/034283
Kind Code:
A1
Abstract:
This free-cutting copper alloy casting contains 75.0-78.5% Cu, 2.95-3.55% Si, 0.07-0.28% Sn, 0.06-0.14% P, 0.022-0.20% Pb, with the remainder being made up of Zn and unavoidable impurities. The composition satisfies the following relations: 76.2 ≤ f1 = Cu + 0.8 × Si – 8.5 × Sn + P + 0.5 × Pb ≤ 80.3, 61.2 ≤ f2 = Cu – 4.4 × Si - 0.8 × Sn – P + 0.5 × Pb ≤ 62.8. The surface area ratios (%) of the constituent phases satisfy the following relations: 25 ≤ κ ≤ 65, 0 ≤ γ ≤ 2.0, 0 ≤ β ≤ 0.3, 0 ≤ μ ≤ 2.0, 96.5 ≤ f3 = α + κ, 99.2 ≤ f4 = α + κ + γ + μ, 0 ≤ f5 = γ + μ ≤ 3.0, 29 ≤ f6 = κ + 6 × γ1/2 + 0.5 × μ ≤ 66. The long side of the γ phase does not exceed 50 μm, the long side of the μ phase does not exceed 25 μm, and the κ phase is present within the α phase.
Inventors:
OISHI KEIICHIRO (JP)
SUZAKI KOUICHI (JP)
TANAKA SHINJI (JP)
GOTO YOSHIYUKI (JP)
SUZAKI KOUICHI (JP)
TANAKA SHINJI (JP)
GOTO YOSHIYUKI (JP)
Application Number:
PCT/JP2017/029374
Publication Date:
February 22, 2018
Filing Date:
August 15, 2017
Export Citation:
Assignee:
MITSUBISHI SHINDO KK (JP)
International Classes:
C22C9/04; C22F1/08; C22F1/00
Domestic Patent References:
| WO2015166998A1 | 2015-11-05 | |||
| WO2013065830A1 | 2013-05-10 |
Foreign References:
| JP2013104071A | 2013-05-30 | |||
| JP2009509031A | 2009-03-05 | |||
| JP2000119774A | 2000-04-25 | |||
| JP2008516081A | 2008-05-15 | |||
| JPH07508560A | 1995-09-21 |
Other References:
See also references of EP 3498872A4
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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