C725 Copper-Nickel-Tin (CuNi9Sn2)

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Overview

Alloy C725 is a moderate strength, low conductivity alloy with excellent bare solderability and corrosion resistance. Applications include electronic parts, springs, connectors and wire wrap terminals.

Physical Properties

Annealing Range (Min) 1200 °F
Annealing Range (Max) 1475 °F
Density 0.321 lb/in³
Electrical Resistivity (Annealed) 94.3 Ω·cir-mil/ft @ 68 °F
Electrical Conductivity (Annealed) 11% IACS @ 68 °F
Thermal Conductivity 31 Btu/ft²/ft·hr/°F @ 68 °F
Coefficient of Thermal Expansion 9.2 per °F (68-572 °F)
Modulus of Elasticity (Tension) 20 ksi
Modulus of Rigidity (Tension) 7 ksi
Melting Point (Solidus) 1,620 °F
Melting Point (Liquidus) 1,880 °F
Annealing Range (Min) 649 °C
Annealing Range (Max) 802 °C
Density 8.94 gm/cm³
Electrical Resistivity (Annealed) 15.67 µΩ·cm @ 20 °C
Electrical Conductivity (Annealed) 0.06 MS·cm @ 20 °C
Thermal Conductivity 54 W/m·K @ 20 °C
Coefficient of Thermal Expansion 16.6 per °C (20-300 °C)
Modulus of Elasticity (Tension) 138 Mpa
Modulus of Rigidity (Tension) 51 Mpa
Melting Point (Solidus) 882 °C
Melting Point (Liquidus) 1,027 °C

Round Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed   55.0 65.0 .0010 - .1285 inch
1/4 Hard H01 65.0 80.0
1/2 Hard H02 75.0 90.0
3/4 Hard H03 80.0 95.0
Hard H04 95.0 110
Spring H08 110 125
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed   370 450 .0254 - 3.264 mm
1/4 Hard H01 440 560
1/2 Hard H02 510 630
3/4 Hard H03 550 660
Hard H04 650 760
Spring H08 750 870

Rolled Flat

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed   45.0 65.0 Thickness:
.0100 - .0500 inch

Width:
.0150 - .2500 inch
1/4 Hard H01 55.0 75.0
1/2 Hard H02 65.0 80.0
3/4 Hard H03 75.0 90.0
Hard H04 80.0 95.0
Spring H08 85.0 100
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed   310 450 Thickness:
.2540 - 1.905 mm

Width:
.3810 - 6.350 mm
1/4 Hard H01 370 520
1/2 Hard H02 440 560
3/4 Hard H03 510 630
Hard H04 550 660
Spring H08 580 690

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