C21000 Brass vs. C51000 Bronze
Both C21000 brass and C51000 bronze are copper alloys. They have a moderately high 94% of their average alloy composition in common.
For each property being compared, the top bar is C21000 brass and the bottom bar is C51000 bronze.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 110 |
| Elongation at Break, % | 2.9 to 50 | |
| 2.7 to 64 |
| Poisson's Ratio | 0.34 | |
| 0.34 |
| Rockwell B Hardness | 36 to 73 | |
| 26 to 97 |
| Rockwell Superficial 30T Hardness | 44 to 68 | |
| 42 to 80 |
| Shear Modulus, GPa | 43 | |
| 42 |
| Shear Strength, MPa | 180 to 280 | |
| 250 to 460 |
| Tensile Strength: Ultimate (UTS), MPa | 240 to 450 | |
| 330 to 780 |
| Tensile Strength: Yield (Proof), MPa | 69 to 440 | |
| 130 to 750 |
Thermal Properties
| Latent Heat of Fusion, J/g | 200 | |
| 200 |
| Maximum Temperature: Mechanical, °C | 190 | |
| 190 |
| Melting Completion (Liquidus), °C | 1070 | |
| 1050 |
| Melting Onset (Solidus), °C | 1050 | |
| 960 |
| Specific Heat Capacity, J/kg-K | 390 | |
| 380 |
| Thermal Conductivity, W/m-K | 230 | |
| 77 |
| Thermal Expansion, µm/m-K | 18 | |
| 18 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 56 | |
| 18 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 57 | |
| 18 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 30 | |
| 33 |
| Density, g/cm3 | 8.8 | |
| 8.8 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 3.1 |
| Embodied Energy, MJ/kg | 42 | |
| 50 |
| Embodied Water, L/kg | 310 | |
| 350 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 13 to 100 | |
| 7.0 to 490 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 21 to 830 | |
| 75 to 2490 |
| Stiffness to Weight: Axial, points | 7.2 | |
| 7.0 |
| Stiffness to Weight: Bending, points | 18 | |
| 18 |
| Strength to Weight: Axial, points | 7.4 to 14 | |
| 10 to 25 |
| Strength to Weight: Bending, points | 9.6 to 15 | |
| 12 to 21 |
| Thermal Diffusivity, mm2/s | 69 | |
| 23 |
| Thermal Shock Resistance, points | 8.1 to 15 | |
| 12 to 28 |
Alloy Composition
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| Copper (Cu), % | 94 to 96 | |
| 92.9 to 95.5 |
| Iron (Fe), % | 0 to 0.050 | |
| 0 to 0.1 |
| Lead (Pb), % | 0 to 0.030 | |
| 0 to 0.050 |
| Phosphorus (P), % | 0 | |
| 0.030 to 0.35 |
| Tin (Sn), % | 0 | |
| 4.5 to 5.8 |
| Zinc (Zn), % | 3.7 to 6.0 | |
| 0 to 0.3 |
| Residuals, % | 0 to 0.2 | |
| 0 to 0.5 |