C18661 Copper-Magnesium (CMg1)

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Overview

Copper-magnesium is a solid solution alloy providing high strength with nominal reduction in conductivity relative to copper. CMg1 is one of the alloys covered by the broad CDA alloy designation C18661 for copper-magnesium. CMg1 combines high electrical conductivity with good tensile strength, excellent solderability and plateability. Applications include connectors, semiconductor pins, catenary trolley cables and conductors. There are no ASTM developed temper ranges for this alloy and the listed values are the recommendations of Fisk Alloy Wire.

Physical Properties

Density 0.321 lb/in³
Electrical Resistivity (Annealed) 14 Ω·cir-mil/ft @ 68 °F
Electrical Conductivity (Annealed) 74% IACS @ 68 °F
Thermal Conductivity 167 Btu/ft²/ft·hr/°F @ 68 °F
Coefficient of Thermal Expansion 9.8 per °F (68-572 °F)
Modulus of Elasticity (Tension) 18 ksi
Modulus of Rigidity (Tension) 7 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) 2.33 µΩ·cm @ 20 °C
Electrical Conductivity (Annealed) 0.43 MS·cm @ 20 °C
Thermal Conductivity 289 W/m·K @ 20 °C
Coefficient of Thermal Expansion 17.6 per °C (20-300 °C)
Modulus of Elasticity (Tension) 125 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   35.0 46.0 .0010 - .1285 inch
1/2 Hard H02 55.0 70.0
Hard H04 75.0 90.0
Spring H08 90.0  
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed   240 320 .0254 - 3.264 mm
1/2 Hard H02 370 490
Hard H04 510 630
Spring H08 620  

Square Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed   35.0 46.0 .0100 - .0808 inch 
1/2 Hard H02 55.0 70.0
Hard H04 75.0 90.0
Spring H08 90.0  
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed   240 320 .2540 - 1.905 mm
1/2 Hard H02 370 490
Hard H04 510 630
Spring H08 620  

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