C18700 Copper vs. S21904 Stainless Steel
C18700 copper belongs to the copper alloys classification, while S21904 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is C18700 copper and the bottom bar is S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 200 |
| Elongation at Break, % | 9.0 to 9.6 | |
| 17 to 51 |
| Poisson's Ratio | 0.34 | |
| 0.28 |
| Shear Modulus, GPa | 43 | |
| 78 |
| Shear Strength, MPa | 170 to 190 | |
| 510 to 620 |
| Tensile Strength: Ultimate (UTS), MPa | 290 to 330 | |
| 700 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 230 to 250 | |
| 390 to 910 |
Thermal Properties
| Latent Heat of Fusion, J/g | 210 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 200 | |
| 980 |
| Melting Completion (Liquidus), °C | 1080 | |
| 1400 |
| Melting Onset (Solidus), °C | 950 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 380 | |
| 480 |
| Thermal Conductivity, W/m-K | 380 | |
| 14 |
| Thermal Expansion, µm/m-K | 17 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 98 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 99 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 30 | |
| 15 |
| Density, g/cm3 | 9.0 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 3.0 |
| Embodied Energy, MJ/kg | 41 | |
| 43 |
| Embodied Water, L/kg | 310 | |
| 160 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 24 to 29 | |
| 160 to 310 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 240 to 280 | |
| 380 to 2070 |
| Stiffness to Weight: Axial, points | 7.1 | |
| 14 |
| Stiffness to Weight: Bending, points | 18 | |
| 25 |
| Strength to Weight: Axial, points | 9.0 to 10 | |
| 25 to 36 |
| Strength to Weight: Bending, points | 11 to 12 | |
| 23 to 29 |
| Thermal Diffusivity, mm2/s | 110 | |
| 3.8 |
| Thermal Shock Resistance, points | 10 to 12 | |
| 15 to 21 |
Alloy Composition
| Carbon (C), % | 0 | |
| 0 to 0.040 |
| Chromium (Cr), % | 0 | |
| 19 to 21.5 |
| Copper (Cu), % | 98 to 99.2 | |
| 0 |
| Iron (Fe), % | 0 | |
| 59.5 to 67.4 |
| Lead (Pb), % | 0.8 to 1.5 | |
| 0 |
| 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 |