C77000(DIN 2.0742,CuNi18Zn27,CW410J,BZn12-26)

Short Introduction:

  • C77000 Alloys offer impressive strength, stress relaxation resistance, solderability, and shelf life. They are extremely resistant to corrosion and therefore will not tarnish easily. Used in applications ranging from decorative belt buckles to aircraft relays where arcing is of concern.

    Description

    C77000(DIN 2.0742,CuNi18Zn27,CW410J,BZn12-26)

    C77000(DIN 2.0742,CuNi18Zn27,CW410J,BZn12-26)

    C77000 Alloys offer impressive strength, stress relaxation resistance, solderability, and shelf life. They are extremely resistant to corrosion and therefore will not tarnish easily. Used in applications ranging from decorative belt buckles to aircraft relays where arcing is of concern.

    Common applications include:

    • C77000 zinc white copper is mainly used for optical instrument parts, springs, resistance wire and so on

    Chemical Composition
    Element
    Cu(1,2) Pb Zn Fe Ni(3) Mn
    (1) Cu + Sum of Named Elements 99.5% min.(2) Cu value includes Ag.(3) Ni value includes Co.
    Min (%) 53.5 16.5
    Max (%) 56.5 0.05 Rem 0.25 19.5 0.50

     

    Mechanical Properties*
    Form Temper Temper Code Tensile Strength
    (ksi)
    YS-0.5% Ext
    (ksi)
    Elongation
    (%)
    Rockwell B scale Rockwell F scale Rockwell 30T scale Torsion Modulus
    (ksi)
    Section Size
    (in)
    Cold Work
    (%)
    Flat Products Extra Hard H06 108   Typ 90   Typ 2.5   Typ 96   Typ 80   Typ 0.04
    Hard H04 100   Typ 85   Typ 3   Typ 91   Typ 77   Typ 6.8   Typ 0.04
    Nominal Grain Size 0.035 mm OS035 60   Typ 27   Typ 40   Typ 55   Typ 90   Typ 0.04
    Spring H08 115   Typ 2.5   Typ 99   Typ 81   Typ 0.04
    Wire Hard H04 145   Typ 2   Typ 0.08 68
    Nominal Grain Size 0.035 mm OS035 60   Typ 40   Typ 0.08
    * Measured at room temperature, 68°F (20°C).

     

    Physical Properties
    Melting Point - Liquidus°F 1930
    Densitylb/cu in. at 68°F 0.314
    Specific Gravity 8.7
    Electrical Conductivity% IACS at 68°F 5.5
    Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 17
    Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 9.3
    Specific Heat CapacityBtu/ lb /°F at 68°F 0.09
    Modulus of Elasticity in Tensionksi 18000
    Modulus of Rigidityksi 6800

     

    Fabrication Properties

    Technique

    Suitability

    Soldering

    Excellent

    Brazing

    Excellent

    Oxyacetylene Welding

    Good

    Gas Shielded Arc Welding

    Fair

    Coated Metal Arc Welding

    Not Recommended

    Spot Weld

    Good

    Seam Weld

    Fair

    Butt Weld

    Good

    Capacity for Being Cold Worked

    Good

    Capacity for Being Hot Formed

    Poor

    Machinability Rating

    30

     

    Applicable Specifications

    Form

    System

    Standard

    Description

    Bar

    ASTM

    B122/B122M

    COPPER-NICKEL-ZINC ALLOY (NICKEL-SILVER) AND COPPER-NICKEL PLATE, SHEET, STRIP, AND ROLLED BAR

    ASTM

    B151/B151M

    COPPER-NICKEL-ZINC ALLOY (NICKEL-SILVER) AND COPPER-NICKEL ROD AND BAR

    SAE

    J461

    WROUGHT AND CAST COPPER ALLOYS

    SAE

    J463

    WROUGHT COPPER AND COPPER ALLOYS

    Plate

    ASTM

    B122/B122M

    COPPER-NICKEL-ZINC ALLOY (NICKEL-SILVER) AND COPPER-NICKEL PLATE, SHEET, STRIP, AND ROLLED BAR

    Rod

    ASTM

    B151/B151M

    COPPER-NICKEL-ZINC ALLOY (NICKEL-SILVER) AND COPPER-NICKEL ROD AND BAR

    SAE

    J461

    WROUGHT AND CAST COPPER ALLOYS

    SAE

    J463

    WROUGHT COPPER AND COPPER ALLOYS

    Sheet

    ASTM

    B122/B122M

    COPPER-NICKEL-ZINC ALLOY (NICKEL-SILVER) AND COPPER-NICKEL PLATE, SHEET, STRIP, AND ROLLED BAR

    SAE

    J461

    WROUGHT AND CAST COPPER ALLOYS

    SAE

    J463

    WROUGHT COPPER AND COPPER ALLOYS

    Strip

    ASTM

    B122/B122M

    COPPER-NICKEL-ZINC ALLOY (NICKEL-SILVER) AND COPPER-NICKEL PLATE, SHEET, STRIP, AND ROLLED BAR

    SAE

    J461

    WROUGHT AND CAST COPPER ALLOYS

    SAE

    J463

    WROUGHT COPPER AND COPPER ALLOYS

    Wire

    ASTM

    B206/B206M

    COPPER-NICKEL-ZINC ALLOY (NICKEL-SILVER WIRE) AND COPPER-NICKEL ALLOY WIRE