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CR021A Copper vs. SAE-AISI 8740 Steel

CR021A copper belongs to the copper alloys classification, while SAE-AISI 8740 steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is CR021A copper and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
190
Elongation at Break, % 15
11 to 23
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 43
73
Tensile Strength: Ultimate (UTS), MPa 230
580 to 670
Tensile Strength: Yield (Proof), MPa 140
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 210
250
Maximum Temperature: Mechanical, °C 200
410
Melting Completion (Liquidus), °C 1090
1460
Melting Onset (Solidus), °C 1040
1420
Specific Heat Capacity, J/kg-K 390
470
Thermal Conductivity, W/m-K 380
39
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 98
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 99
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 31
2.6
Density, g/cm3 9.0
7.8
Embodied Carbon, kg CO2/kg material 2.6
1.5
Embodied Energy, MJ/kg 41
20
Embodied Water, L/kg 320
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 83
390 to 850
Stiffness to Weight: Axial, points 7.2
13
Stiffness to Weight: Bending, points 18
24
Strength to Weight: Axial, points 7.1
20 to 24
Strength to Weight: Bending, points 9.3
20 to 22
Thermal Diffusivity, mm2/s 110
10
Thermal Shock Resistance, points 8.1
17 to 20

Alloy Composition

Bismuth (Bi), % 0 to 0.00050
0
Carbon (C), % 0
0.38 to 0.43
Chromium (Cr), % 0
0.4 to 0.6
Copper (Cu), % 99.95 to 99.998
0
Iron (Fe), % 0
96.5 to 97.7
Lead (Pb), % 0 to 0.0050
0
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0.0020 to 0.0070
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Silver (Ag), % 0 to 0.015
0
Sulfur (S), % 0
0 to 0.040