ASTM A387 Grade 21 Steel vs. SAE-AISI 50B60 Steel
Both ASTM A387 grade 21 steel and SAE-AISI 50B60 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is SAE-AISI 50B60 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 to 180 | |
| 180 to 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 21 | |
| 12 to 20 |
| Fatigue Strength, MPa | 160 to 250 | |
| 240 to 330 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 74 | |
| 72 |
| Shear Strength, MPa | 310 to 370 | |
| 380 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 610 to 630 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 350 to 530 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 480 | |
| 410 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1450 |
| Melting Onset (Solidus), °C | 1430 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 41 | |
| 45 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 2.0 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 1.4 |
| Embodied Energy, MJ/kg | 23 | |
| 19 |
| Embodied Water, L/kg | 62 | |
| 48 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
| 71 to 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
| 330 to 750 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 22 to 23 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 20 to 21 |
| Thermal Diffusivity, mm2/s | 11 | |
| 12 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 20 |
Alloy Composition
| Boron (B), % | 0 | |
| 0.00050 to 0.0030 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0.56 to 0.64 |
| Chromium (Cr), % | 2.8 to 3.3 | |
| 0.4 to 0.6 |
| Iron (Fe), % | 94.4 to 96 | |
| 97.3 to 98.1 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 0 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 0.5 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.040 |