Description
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
| 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 |
| 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). | |||||||||||
| 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 |
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 |
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 |
