Title:
REINFORCED &agr -BRASS AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2006/082921
Kind Code:
A1
Abstract:
A reinforced &agr -brass that as compared with conventional brass material, realizes an excellent balance of high proof stress and moldability without deterioration of stress relaxation characteristics; a process for producing the same. Accordingly, there is employed a reinforced &agr -brass produced by providing a starting plate material obtained by carrying out recrystallization annealing of a reinforced &agr -brass composed of 63 to 75 wt.% of copper and the balance of zinc and unavoidable impurities so as to have a crystal particle diameter of 1 to 2 μm, performing cold rolling of the starting plate material at a reduction ratio of 5 to 40%, and carrying out low-temperature annealing at ≥ temperature bringing about the maximum value of 0.2% proof stress (&sgr 0.2: MPa) so that the 0.2% proof stress (&sgr 0.2: MPa) is adjusted to ≥ 90% of the maximum value and ranges from 450 to 750 MPa and so that the minimum bending radius (MBR)/plate thickness (t) and the 0.2% proof stress (&sgr 0.2: MPa) satisfy the relationship: MBR/t ≤ 0.0125×&sgr 0.2 - 6.7, and preferably so that the Erichsen value (Er: mm) and the 0.2% proof stress (&sgr 0.2: MPa) satisfy the relationship: Er ≥ -0.011×&sgr 0.2 + 13.7.
Inventors:
YAMAGUCHI HIROSHI (JP)
Application Number:
PCT/JP2006/301860
Publication Date:
August 10, 2006
Filing Date:
February 03, 2006
Export Citation:
Assignee:
MITSUI MINING & SMELTING CO (JP)
YAMAGUCHI HIROSHI (JP)
YAMAGUCHI HIROSHI (JP)
International Classes:
C22C9/04; B21B1/22; B21B3/00; C22F1/08; C22F1/00
Foreign References:
| JP2004292875A | 2004-10-21 | |||
| JPS5447823A | 1979-04-14 |
Attorney, Agent or Firm:
Yoshimura, Katsuhiro c/o Yoshimura International Patent Office (Omiya F Bldg. 5-4, Sakuragicho 2-chome, Omiya-k, Saitama-shi Saitama 54, JP)
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