SAE-AISI 1020 Steel vs. ASTM A387 Grade 21L Class 1
Both SAE-AISI 1020 steel and ASTM A387 grade 21L class 1 are iron alloys. They have a very high 96% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 1020 steel and the bottom bar is ASTM A387 grade 21L class 1.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 120 to 130 | |
| 150 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 17 to 28 | |
| 21 |
| Fatigue Strength, MPa | 180 to 250 | |
| 160 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 74 |
| Shear Strength, MPa | 280 | |
| 310 |
| Tensile Strength: Ultimate (UTS), MPa | 430 to 460 | |
| 500 |
| Tensile Strength: Yield (Proof), MPa | 240 to 380 | |
| 230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 480 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1470 |
| Melting Onset (Solidus), °C | 1420 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 52 | |
| 41 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 11 | |
| 7.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 12 | |
| 8.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 4.1 |
| Density, g/cm3 | 7.9 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.8 |
| Embodied Energy, MJ/kg | 18 | |
| 23 |
| Embodied Water, L/kg | 45 | |
| 62 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 72 to 100 | |
| 84 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 to 380 | |
| 140 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 15 to 16 | |
| 18 |
| Strength to Weight: Bending, points | 16 to 17 | |
| 18 |
| Thermal Diffusivity, mm2/s | 14 | |
| 11 |
| Thermal Shock Resistance, points | 13 to 14 | |
| 14 |
Alloy Composition
| Carbon (C), % | 0.18 to 0.23 | |
| 0 to 0.1 |
| Chromium (Cr), % | 0 | |
| 2.8 to 3.3 |
| Iron (Fe), % | 99.08 to 99.52 | |
| 94.4 to 96.1 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0 | |
| 0.9 to 1.1 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.025 |