C18661 Copper-Magnesium (CMG1) Alloy Wire

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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.

Mechanical Properties

Round Wire

Temper Name Temper Code Tensile Strength (N/mm²) Mill Limits
Min Max
Annealed   240 315 .0254 - 3.264 mm
1/2 Hard H02 380 485
Hard H04 515 620
Spring H08 620 0

Square Wire

Temper Name Temper Code Tensile Strength (N/mm²) Mill Limits
Min Max
Annealed   240 315 .2540 - 1.905 mm
1/2 Hard H02 380 485
Hard H04 515 620
Spring H08 620 0

Physical Properties

Melting Point (Liquidis) 1070°C
Melting Point (Solidus) 1010°C
Density 8.8854 gm/cu cm
Electrical Resistivity (Annealed) 2.344 ?? -cm @ 20°C
Electrical Conductivity (Annealed) 0.429 MegaSiemens /cm @ 20°C
Coefficient of Thermal Expansion 0.00001764°C (20-300°C)
Modulus of Elasticity (Tension) 32625 MPa

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