ASTM A321 Carbon Steel vs. SAE-AISI 1070 Steel
Both ASTM A321 carbon steel and SAE-AISI 1070 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is ASTM A321 carbon steel and the bottom bar is SAE-AISI 1070 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 | |
| 190 to 230 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 21 | |
| 10 to 13 |
| Fatigue Strength, MPa | 270 | |
| 270 to 350 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 39 | |
| 34 to 51 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Shear Strength, MPa | 420 | |
| 380 to 460 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 640 to 760 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 420 to 560 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 400 |
| 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 | 51 | |
| 50 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.1 | |
| 10 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.1 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.4 |
| Embodied Energy, MJ/kg | 18 | |
| 19 |
| Embodied Water, L/kg | 46 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 59 to 86 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 400 | |
| 470 to 850 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 24 | |
| 23 to 27 |
| Strength to Weight: Bending, points | 22 | |
| 21 to 24 |
| Thermal Diffusivity, mm2/s | 14 | |
| 14 |
| Thermal Shock Resistance, points | 21 | |
| 21 to 25 |
Alloy Composition
| Carbon (C), % | 0 to 0.55 | |
| 0.65 to 0.75 |
| Iron (Fe), % | 98.1 to 99.25 | |
| 98.3 to 98.8 |
| Manganese (Mn), % | 0.6 to 0.9 | |
| 0.6 to 0.9 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.050 |