Free-cutting copper alloy containing very low lead

Free-cutting copper alloy containing very low lead

  • CN 101,098,976 B
  • Filed: 09/22/2005
  • Issued: 08/13/2014
  • Est. Priority Date: 09/22/2005
  • Status: Active Grant
First Claim
Patent Images

1. a free-cutting copper alloy, substantially by copper:

  • 71.5~

    78.5 % by weight;

    Silicon;

    2.0~

    4.5 % by weight;

    Plumbous;

    0.005~

    be less than 0.02 % by weight;

    And zinc;

    residual content forms,Wherein the copper of above-mentioned copper alloy and the % by weight of silicon meet relation61-50Pb≤

    X-4Y≤

    66+50Pb,

    Wherein, Pb is plumbous % by weight,X is the % by weight of copper, andY is the % by weight of silicon, and whereinMeet each in following additional relationships;

    30%≤

    α

    phase in total phase area of above-mentioned alloy0%≤

    β

    phase≤

    5% in total phase area of above-mentioned alloy;

    0%≤

    μ

    phase≤

    20% in total phase area of above-mentioned alloy;

    And18-500 (Pb) %≤

    κ

    phase+γ

    phase+0.3 (μ

    phase)-β

    phase≤

    56+500 (Pb) % in total phase area of above-mentioned alloy.

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