C425 Copper-Zinc-Tin Alloy Wire (CuSn3Zn9)

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Alloy C425 is a low zinc-containing alloy with good combination of tensile strength, electrical conductivity, formability and corrosion resistance. Applications include electrical springs, connectors and terminals.

Mechanical Properties

Round Wire

Temper Name  Temper Code  Tensile Strength (N/mm²) Mill Limits 
Min Max
Annealed   290 360 .0254 - 3.264 mm
1/4 Hard H01 395 495
1/2 Hard H02 505 605
3/4 Hard H03 585 690
Hard H04 655 760
Extra Hard H06 725 825
Spring H08 795 0

Square Wire

Temper Name  Temper Code  Tensile Strength (N/mm²) Mill Limits 
Min Max
Annealed   290 360 .2540 - 1.905 mm
1/4 Hard H01 395 495
1/2 Hard H02 505 605
3/4 Hard H03 585 690
Hard H04 655 760
Extra Hard H06 725 825
Spring H08 795 0

Rolled Flat

Temper Name  Temper Code  Tensile Strength (N/mm²) Mill Limits 
Min Max
Annealed   275 345

Thickness:
.2540 - 1.905 mm

Width:
.3810 - 6.350 mm

1/4 Half Hard H01 340 405
1/2 Hard H02 395 475
3/4 Hard H03 425 510
Hard H04 485 565
Extra Hard H06 525 605
Spring H08 580 650
Extra Spring H10 635 0

Physical Properties

Melting Point (Liquidis) 1032°C
Melting Point (Solidus) 1010°C
Density 8.74696 gm/cu cm
Electrical Resistivity (Annealed) 6.151 ?? -cm @ 20°C
Electrical Conductivity (Annealed) 0.16392 MegaSiemens /cm @ 20°C
Thermal Conductivity (Solutionized-Aged) 119.4789 W/m · °K @ 20°C
Coefficient of Thermal Expansion 0.00001836°C (20-300°C)
Modulus of Elasticity (Tension) 110300 MPa

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