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C81400 Copper vs. S21900 Stainless Steel

C81400 copper belongs to the copper alloys classification, while S21900 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is C81400 copper and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
200
Elongation at Break, % 11
50
Poisson's Ratio 0.34
0.28
Shear Modulus, GPa 41
78
Tensile Strength: Ultimate (UTS), MPa 370
710
Tensile Strength: Yield (Proof), MPa 250
390

Thermal Properties

Latent Heat of Fusion, J/g 210
290
Maximum Temperature: Mechanical, °C 200
980
Melting Completion (Liquidus), °C 1090
1400
Melting Onset (Solidus), °C 1070
1350
Specific Heat Capacity, J/kg-K 390
480
Thermal Conductivity, W/m-K 260
14
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 61
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 33
15
Density, g/cm3 8.9
7.7
Embodied Carbon, kg CO2/kg material 2.8
3.0
Embodied Energy, MJ/kg 45
43
Embodied Water, L/kg 310
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 36
300
Resilience: Unit (Modulus of Resilience), kJ/m3 260
380
Stiffness to Weight: Axial, points 7.3
14
Stiffness to Weight: Bending, points 18
25
Strength to Weight: Axial, points 11
26
Strength to Weight: Bending, points 13
23
Thermal Diffusivity, mm2/s 75
3.8
Thermal Shock Resistance, points 13
15

Alloy Composition

Beryllium (Be), % 0.020 to 0.1
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0.6 to 1.0
19 to 21.5
Copper (Cu), % 98.4 to 99.38
0
Iron (Fe), % 0
59.4 to 67.4
Manganese (Mn), % 0
8.0 to 10
Nickel (Ni), % 0
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Residuals, % 0 to 0.5
0