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