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C18700 Copper vs. S31730 Stainless Steel

C18700 copper belongs to the copper alloys classification, while S31730 stainless steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is C18700 copper and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 9.0 to 9.6
40
Poisson's Ratio 0.34
0.28
Shear Modulus, GPa 43
77
Shear Strength, MPa 170 to 190
370
Tensile Strength: Ultimate (UTS), MPa 290 to 330
540
Tensile Strength: Yield (Proof), MPa 230 to 250
200

Thermal Properties

Latent Heat of Fusion, J/g 210
290
Maximum Temperature: Mechanical, °C 200
990
Melting Completion (Liquidus), °C 1080
1430
Melting Onset (Solidus), °C 950
1390
Specific Heat Capacity, J/kg-K 380
470
Thermal Expansion, µm/m-K 17
16

Otherwise Unclassified Properties

Base Metal Price, % relative 30
24
Density, g/cm3 9.0
8.0
Embodied Carbon, kg CO2/kg material 2.6
4.6
Embodied Energy, MJ/kg 41
63
Embodied Water, L/kg 310
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 29
170
Resilience: Unit (Modulus of Resilience), kJ/m3 240 to 280
99
Stiffness to Weight: Axial, points 7.1
14
Stiffness to Weight: Bending, points 18
24
Strength to Weight: Axial, points 9.0 to 10
19
Strength to Weight: Bending, points 11 to 12
18
Thermal Shock Resistance, points 10 to 12
12

Alloy Composition

Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
17 to 19
Copper (Cu), % 98 to 99.2
4.0 to 5.0
Iron (Fe), % 0
52.4 to 61
Lead (Pb), % 0.8 to 1.5
0
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 0
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Residuals, % 0 to 0.5
0