Find suppliers for this alloyC78270
Chemical Composition
(1) Cu value includes Ag. (2) Cu + Sum of Named Elements 99.5% min. (3) Ni value includes Co.
Min (%)
Max (%)68.01.8Rem0.356.00.50
Mechanical Properties*
Temper Code
Tensile Strength
YS-0.5% Ext
Rockwell B scale
Rockwell F scale
Rockwell 30T scale
Shear Strength
Section Size
Flat Products1/2 HardH0269   Typ
58   Typ
12   Typ
78   Typ
69   Typ
47   Typ
1/4 HardH0162   Typ
42   Typ
24   Typ
65   Typ
63   Typ
44   Typ
3/4 HardH0378   Typ
63   Typ
5   Typ
84   Typ
72   Typ
51   Typ
Extra HardH0691   Typ
76   Typ
3   Typ
90   Typ
75   Typ
HardH0485   Typ
73   Typ
4   Typ
87   Typ
74   Typ
54   Typ
Nominal Grain Size 0.015 mmOS01559   Typ
27   Typ
32   Typ
85   Typ
43   Typ
Nominal Grain Size 0.035 mmOS03553   Typ
23   Typ
40   Typ
78   Typ
40   Typ
* Measured at room temperature, 68°F (20°C).
Physical Properties
Melting Point - Liquidus°F18300
Melting Point - Solidus°F1780
Densitylb/cu in. at 68°F0.31
Specific Gravity8.69
Electrical Conductivity% IACS at 68°F10
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F28
Coefficient of Thermal Expansion 68-21210⁻⁶ per °F (68 – 212°F)10.3
Specific Heat CapacityBtu/ lb /°F at 68°F0.09
Modulus of Elasticity in Tensionksi17000
Modulus of Rigidityksi6400
Fabrication Properties
Technique Suitability
Oxyacetylene WeldingNot Recommended
Gas Shielded Arc WeldingNot Recommended
Coated Metal Arc WeldingNot Recommended
Spot WeldNot Recommended
Seam WeldNot Recommended
Butt WeldFair
Capacity for Being Cold WorkedGood
Capacity for Being Hot FormedPoor
Machinability Rating60
Fabrication Process Properties

No fabrication process properties for this alloy

Thermal Characteristics

No thermal characteristics for this alloy

Typical uses
Product Category Product Reason Category Reason
ConsumerWatch Parts, Watch Plates
HardwareKey Blanks
Applicable Specifications

No applicable specifications for this alloy

Corrosion Properties

No information available.