R30556 Alloy vs. SAE-AISI 8720 Steel
Both R30556 alloy and SAE-AISI 8720 steel are iron alloys. Both are furnished in the annealed condition. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is R30556 alloy and the bottom bar is SAE-AISI 8720 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 45 | |
| 25 |
| Fatigue Strength, MPa | 320 | |
| 240 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 73 |
| Shear Strength, MPa | 550 | |
| 320 |
| Tensile Strength: Ultimate (UTS), MPa | 780 | |
| 500 |
| Tensile Strength: Yield (Proof), MPa | 350 | |
| 330 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 410 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1460 |
| Melting Onset (Solidus), °C | 1330 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 11 | |
| 39 |
| Thermal Expansion, µm/m-K | 15 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.8 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.9 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 70 | |
| 2.6 |
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.7 | |
| 1.5 |
| Embodied Energy, MJ/kg | 130 | |
| 20 |
| Embodied Water, L/kg | 300 | |
| 50 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 290 | |
| 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 290 | |
| 290 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 26 | |
| 18 |
| Strength to Weight: Bending, points | 22 | |
| 18 |
| Thermal Diffusivity, mm2/s | 2.9 | |
| 10 |
| Thermal Shock Resistance, points | 18 | |
| 17 |
Alloy Composition
| Aluminum (Al), % | 0.1 to 0.5 | |
| 0 |
| Boron (B), % | 0 to 0.020 | |
| 0 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0.18 to 0.23 |
| Chromium (Cr), % | 21 to 23 | |
| 0.4 to 0.6 |
| Cobalt (Co), % | 16 to 21 | |
| 0 |
| Iron (Fe), % | 20.4 to 38.2 | |
| 96.8 to 98 |
| Lanthanum (La), % | 0.0050 to 0.1 | |
| 0 |
| Manganese (Mn), % | 0.5 to 2.0 | |
| 0.7 to 0.9 |
| Molybdenum (Mo), % | 2.5 to 4.0 | |
| 0.2 to 0.3 |
| Nickel (Ni), % | 19 to 22.5 | |
| 0.4 to 0.7 |
| Niobium (Nb), % | 0 to 0.3 | |
| 0 |
| Nitrogen (N), % | 0.1 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.2 to 0.8 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.040 |
| Tantalum (Ta), % | 0.3 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.5 | |
| 0 |
| Zinc (Zn), % | 0.0010 to 0.1 | |
| 0 |