SAE-AISI 8640 Steel vs. ASTM A372 Grade L Steel
Both SAE-AISI 8640 steel and ASTM A372 grade L steel are iron alloys. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is SAE-AISI 8640 steel and the bottom bar is ASTM A372 grade L steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 170 | |
350 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 23 | |
14 |
Fatigue Strength, MPa | 270 | |
670 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Shear Strength, MPa | 360 | |
700 |
Tensile Strength: Ultimate (UTS), MPa | 570 | |
1160 |
Tensile Strength: Yield (Proof), MPa | 380 | |
1040 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
250 |
Maximum Temperature: Mechanical, °C | 410 | |
430 |
Melting Completion (Liquidus), °C | 1460 | |
1460 |
Melting Onset (Solidus), °C | 1420 | |
1420 |
Specific Heat Capacity, J/kg-K | 470 | |
470 |
Thermal Conductivity, W/m-K | 39 | |
44 |
Thermal Expansion, µm/m-K | 13 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
7.5 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
8.6 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 2.6 | |
3.5 |
Density, g/cm3 | 7.8 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 1.5 | |
1.7 |
Embodied Energy, MJ/kg | 20 | |
22 |
Embodied Water, L/kg | 50 | |
54 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
150 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 | |
2890 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 20 | |
41 |
Strength to Weight: Bending, points | 20 | |
31 |
Thermal Diffusivity, mm2/s | 10 | |
12 |
Thermal Shock Resistance, points | 17 | |
34 |
Alloy Composition
Carbon (C), % | 0.38 to 0.43 | |
0.38 to 0.43 |
Chromium (Cr), % | 0.4 to 0.6 | |
0.7 to 0.9 |
Iron (Fe), % | 96.6 to 97.8 | |
95.2 to 96.3 |
Manganese (Mn), % | 0.75 to 1.0 | |
0.6 to 0.8 |
Molybdenum (Mo), % | 0.15 to 0.25 | |
0.2 to 0.3 |
Nickel (Ni), % | 0.4 to 0.7 | |
1.7 to 2.0 |
Phosphorus (P), % | 0 to 0.035 | |
0 to 0.015 |
Silicon (Si), % | 0.15 to 0.35 | |
0.15 to 0.35 |
Sulfur (S), % | 0 to 0.040 | |
0 to 0.010 |