C70250 High Performance Alloy (CuNi3Si1)

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Overview

Alloy C70250 is a high-performance Alloy that combines strength, conductivity, formability and stress relaxation resistance into a unique set of properties. C70250 has the qualities of some of the Beryllium Coppers without containing any Beryllium. The alloy is a thermally aged material. It achieves its properties by combinations of cold work and heat treatments, all of which is done at the mill. The alloy’s high strength and conductivity combined with its formability and stress relaxation properties make C70250 an excellent electronic alloy, particularly in high temperature environments.

Physical Properties

Density 0.318 lb/in³
Electrical Resistivity (Annealed) 25.9 Ω·cir-mil/ft @ 68 °F
Electrical Conductivity (Annealed) 40% IACS @ 68 °F
Thermal Conductivity 98 Btu/ft²/ft·hr/°F @ 68 °F
Modulus of Elasticity (Tension) 19 ksi
Melting Point (Solidus) 1,700 °F
Melting Point (Liquidus) 1,900 °F
Annealing Range (Min) -18 °C
Annealing Range (Max) -18 °C
Density 8.94 gm/cm³
Electrical Resistivity (Annealed) 4.31 µΩ·cm @ 20 °C
Electrical Conductivity (Annealed) 0.23 MS·cm @ 20 °C
Thermal Conductivity 170 W/m·K @ 20 °C
Modulus of Elasticity (Tension) 131 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
1/2 Hard TL02 80.0 100 .0010 - .1285 inch
3/4 AT TL03 100 120
1/2 AT + SR TR02 88.0  
AM TM00 90.0 110
1/2 HM TM02 95.0 120
3/4 HM TM03 100 125
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
1/2 Hard TL02 550 690 .0254 - 3.264 mm
3/4 AT TL03 680 830
1/2 AT + SR TR02 600  
AM TM00 620 760
1/2 HM TM02 650 830
3/4 HM TM03 680 870

Square Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
1/2 Hard TL02 80.0 100 .0100 - .0808 inch 
3/4 AT TL03 100 120
1/2 AT + SR TR02 88.0  
AM TM00 90.0 110
1/2 HM TM02 95.0 120
3/4 HM TM03 100 125
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
1/2 Hard TL02 550 690 .2540 - 1.905 mm
3/4 AT TL03 680 830
1/2 AT + SR TR02 600  
AM TM00 620 760
1/2 HM TM02 650 830
3/4 HM TM03 680 870

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