C725 Copper-Nickel-Tin (CuNi9Sn2)

  • Home
  • Fisk Products
  • C72500

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) 1,700 °F
Melting Point (Liquidus) 1,900 °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) 927 °C
Melting Point (Liquidus) 1,038 °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

Contact Request

Please provide your contact information along with any relevant details, below, and a representative from Fisk Alloy will contact you shortly.

Quality Second to None

Providing Innovative and Sustainable Solutions

If you’d like to request a sample, have specific product questions, or you’re interested in finding out more about which Fisk products might be best for your application or design, please fill out the form and we will contact you.

Environmental
Sensitivity
Personalized
Solutions
Performance
Measures