SAE-AISI 8740 Steel vs. ZA-8
SAE-AISI 8740 steel belongs to the iron alloys classification, while ZA-8 belongs to the zinc alloys. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is ZA-8.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 170 to 200 | |
| 87 to 100 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 85 to 86 |
| Elongation at Break, % | 11 to 23 | |
| 1.3 to 8.0 |
| Fatigue Strength, MPa | 270 to 350 | |
| 51 to 100 |
| Poisson's Ratio | 0.29 | |
| 0.26 |
| Shear Modulus, GPa | 73 | |
| 34 |
| Shear Strength, MPa | 370 to 400 | |
| 240 to 280 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 670 | |
| 210 to 370 |
| Tensile Strength: Yield (Proof), MPa | 380 to 570 | |
| 210 to 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 110 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 100 |
| Melting Completion (Liquidus), °C | 1460 | |
| 400 |
| Melting Onset (Solidus), °C | 1420 | |
| 380 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 440 |
| Thermal Conductivity, W/m-K | 39 | |
| 120 |
| Thermal Expansion, µm/m-K | 13 | |
| 23 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 28 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 40 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 11 |
| Density, g/cm3 | 7.8 | |
| 6.3 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 3.3 |
| Embodied Energy, MJ/kg | 20 | |
| 62 |
| Embodied Water, L/kg | 50 | |
| 420 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 to 120 | |
| 2.8 to 28 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 to 850 | |
| 260 to 490 |
| Stiffness to Weight: Axial, points | 13 | |
| 7.5 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 20 to 24 | |
| 9.3 to 17 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 12 to 18 |
| Thermal Diffusivity, mm2/s | 10 | |
| 42 |
| Thermal Shock Resistance, points | 17 to 20 | |
| 7.6 to 13 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 8.0 to 8.8 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.0060 |
| Carbon (C), % | 0.38 to 0.43 | |
| 0 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0.8 to 1.3 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 0 to 0.075 |
| Lead (Pb), % | 0 | |
| 0 to 0.0060 |
| Magnesium (Mg), % | 0 | |
| 0.015 to 0.030 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 0 to 0.020 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.045 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 |
| Tin (Sn), % | 0 | |
| 0 to 0.0030 |
| Zinc (Zn), % | 0 | |
| 89.7 to 91.2 |