ASTM A302 Alloy Steel vs. S21904 Stainless Steel
Both ASTM A302 alloy steel and S21904 stainless steel are iron alloys. 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 ASTM A302 alloy steel and the bottom bar is S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 to 190 | |
| 210 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 20 to 23 | |
| 17 to 51 |
| Fatigue Strength, MPa | 250 to 280 | |
| 380 to 550 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 78 |
| Shear Strength, MPa | 370 to 390 | |
| 510 to 620 |
| Tensile Strength: Ultimate (UTS), MPa | 590 to 620 | |
| 700 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 350 to 390 | |
| 390 to 910 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 980 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1400 |
| Melting Onset (Solidus), °C | 1420 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 39 to 51 | |
| 14 |
| Thermal Expansion, µm/m-K | 13 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 to 7.4 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.2 to 8.4 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 to 3.0 | |
| 15 |
| Density, g/cm3 | 7.8 to 7.9 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.5 to 1.6 | |
| 3.0 |
| Embodied Energy, MJ/kg | 20 to 21 | |
| 43 |
| Embodied Water, L/kg | 48 to 50 | |
| 160 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 120 | |
| 160 to 310 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 330 to 410 | |
| 380 to 2070 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 21 to 22 | |
| 25 to 36 |
| Strength to Weight: Bending, points | 20 to 21 | |
| 23 to 29 |
| Thermal Diffusivity, mm2/s | 10 to 14 | |
| 3.8 |
| Thermal Shock Resistance, points | 17 to 18 | |
| 15 to 21 |