ASTM A387 Grade 9 Steel vs. ASTM A302 Alloy Steel
Both ASTM A387 grade 9 steel and ASTM A302 alloy steel are iron alloys. 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 9 steel and the bottom bar is ASTM A302 alloy 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, % | 20 to 21 | |
| 20 to 23 |
| Fatigue Strength, MPa | 160 to 240 | |
| 250 to 280 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 73 |
| Shear Strength, MPa | 310 to 380 | |
| 370 to 390 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 600 | |
| 590 to 620 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 350 to 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 600 | |
| 410 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 26 | |
| 39 to 51 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 9.0 | |
| 7.2 to 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 10 | |
| 8.2 to 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 6.5 | |
| 2.4 to 3.0 |
| Density, g/cm3 | 7.8 | |
| 7.8 to 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.1 | |
| 1.5 to 1.6 |
| Embodied Energy, MJ/kg | 28 | |
| 20 to 21 |
| Embodied Water, L/kg | 87 | |
| 48 to 50 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 83 to 110 | |
| 110 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 310 | |
| 330 to 410 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 21 to 22 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 20 to 21 |
| Thermal Diffusivity, mm2/s | 6.9 | |
| 10 to 14 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 17 to 18 |