SAE-AISI 8740 Steel vs. ASTM Grade LC9 Steel
Both SAE-AISI 8740 steel and ASTM grade LC9 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 28 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 SAE-AISI 8740 steel and the bottom bar is ASTM grade LC9 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 170 to 200 | |
| 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 23 | |
| 22 |
| Fatigue Strength, MPa | 270 to 350 | |
| 420 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 670 | |
| 660 |
| Tensile Strength: Yield (Proof), MPa | 380 to 570 | |
| 590 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 430 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1450 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 8.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 8.0 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 2.3 |
| Embodied Energy, MJ/kg | 20 | |
| 31 |
| Embodied Water, L/kg | 50 | |
| 65 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 to 120 | |
| 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 to 850 | |
| 920 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 20 to 24 | |
| 23 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 21 |
| Thermal Shock Resistance, points | 17 to 20 | |
| 20 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.13 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0 to 0.5 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 87.4 to 91.5 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 to 0.9 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 to 0.2 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 8.5 to 10 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.45 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.045 |
| Vanadium (V), % | 0 | |
| 0 to 0.030 |