Title:
HOT-FORGED COPPER ALLOY ARTICLE
Document Type and Number:
WIPO Patent Application WO/2013/065830
Kind Code:
A1
Abstract:
A tubular hot-forged copper alloy article has an alloy composition comprising 59.0-84.0 mass% of Cu, 0.003-0.3 mass% of Pb and a remainder made up by Zn and unavoidable impurities, wherein the content of Cu [Cu] (mass%) and the content of Pb [Pb] (mass%) have a relationship represented by the formula: 59 ≤ ([Cu]+0.5×[Pb]) ≤ 64, the shape of the article fulfills the formulae: 0.4 ≤ (average inner diameter)/(average outer diameter) ≤ 0.92, 0.04 ≤ (average thickness)/(average outer diameter) ≤ 0.3 and 1 ≤ (length in tube axis direction)/(average thickness) ≤ 10, and a forging material that is not hot-forged yet has a tubular form, fulfills the formulae: 0.3 ≤ (average inner diameter/average outer diameter) ≤ 0.88, 0.06 ≤ (average thickness)/(average outer diameter) ≤ 0.35 and 0.8 ≤ (length in tube axis direction)/(average thickness) ≤ 12, and fulfills the formulae: 0 ≤ (degree of thickness unevenness) ≤ 30% and 0 ≤ (degree of thickness unevenness) ≤ 75×1/((length in tube axis direction)/(average thickness))1/2 at any position located in the tube axis direction.
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Inventors:
OISHI KEIICHIRO (JP)
OKA TAKAYUKI (JP)
OIKAWA SHIN (JP)
OKA TAKAYUKI (JP)
OIKAWA SHIN (JP)
Application Number:
PCT/JP2012/078508
Publication Date:
May 10, 2013
Filing Date:
November 02, 2012
Export Citation:
Assignee:
MITSUBISHI SHINDO KK (JP)
International Classes:
C22C9/04; C22F1/08; C22F1/00
Domestic Patent References:
| WO2006016442A1 | 2006-02-16 |
Foreign References:
| JP2001089835A | 2001-04-03 | |||
| JP2009007673A | 2009-01-15 | |||
| JPS6293331A | 1987-04-28 | |||
| JP2000119774A | 2000-04-25 | |||
| JP2002012928A | 2002-01-15 |
Other References:
See also references of EP 2775005A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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Claims: