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US08968492B2 Lead-free free-machining brass having improved castability 有权
无铅自由加工黄铜具有改进的浇注性能

  • Patent Title: Lead-free free-machining brass having improved castability
  • Patent Title (中): 无铅自由加工黄铜具有改进的浇注性能
  • Application No.: US12308966
    Application Date: 2008-10-01
  • Publication No.: US08968492B2
    Publication Date: 2015-03-03
  • Inventor: Toru Uchida
  • Applicant: Toru Uchida
  • Applicant Address: JP Fukuoka-ken
  • Assignee: Toto Ltd.
  • Current Assignee: Toto Ltd.
  • Current Assignee Address: JP Fukuoka-ken
  • Agency: Carrier Blackman & Associates, P.C.
  • Agent Joseph P. Carrier; William D. Blackman
  • Priority: JP2007-264490 20071010; WOPCT/JP2008/050145 20080109; JP2008-157024 20080616
  • International Application: PCT/JP2008/067853 WO 20081001
  • International Announcement: WO2009/048008 WO 20090416
  • Main IPC: C22C9/04
  • IPC: C22C9/04 ;  B22C9/22
Lead-free free-machining brass having improved castability
Abstract:
There is provided a brass free from lead (Pb) and possessing excellent machinability, castability, mechanical properties and other properties. A brass consisting of not less than 55% by weight and not more than 75% by weight of copper (Cu), not less than 0.3% by weight and not more than 4.0% by weight of bismuth (Bi), and y % by weight of boron (B) and x % by weight of silicon (Si), y and x satisfying the following requirements: 0≦x≦2.0, 0≦y≦0.3, and y>−0.15x+0.015ab, wherein a is 0.2 when Bi is 0.3% by weight ≦Bi
Abstract(Chinese):

提供了不含铅（Pb）的黄铜，具有优异的机械加工性，浇铸性，机械性能等特性。 由不少于55重量％且不超过75重量％的铜（Cu）组成的黄铜，不小于0.3重量％且不大于4.0重量％的铋（Bi），y％由 0≤n1E; x＆nlE; 2.0,0＆nlE; y＆nlE; 0.3，y> -0.15x + 0.015ab，其中a为硼（B）重量和x重量％硅（Si），y和x满足以下要求： Bi为0.3％（重量）时，Bi≤0.75％（重量）; 0.85当Bi为0.75％（重量）时，Bi <1.5％（重量）; 当Bi为1.5重量％且nlE时为1;当Zn（Zn）的表观含量不小于37％且小于41％时，Bi为1; 4.0重量％，b为1; 和0.75当Zn的表观含量不小于41％且不大于45％时，余量由Zn和不可避免的杂质组成，具有优异的浇铸性，以及例如机械加工性和机械性能。

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