ASTM A302 Alloy Steel vs. AISI 309 Stainless Steel
Both ASTM A302 alloy steel and AISI 309 stainless steel are iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is ASTM A302 alloy steel and the bottom bar is AISI 309 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 to 190 | |
| 180 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 20 to 23 | |
| 34 to 47 |
| Fatigue Strength, MPa | 250 to 280 | |
| 250 to 280 |
| Poisson's Ratio | 0.29 | |
| 0.27 |
| Shear Modulus, GPa | 73 | |
| 78 |
| Shear Strength, MPa | 370 to 390 | |
| 420 to 470 |
| Tensile Strength: Ultimate (UTS), MPa | 590 to 620 | |
| 600 to 710 |
| Tensile Strength: Yield (Proof), MPa | 350 to 390 | |
| 260 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 980 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1450 |
| Melting Onset (Solidus), °C | 1420 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 39 to 51 | |
| 16 |
| Thermal Expansion, µm/m-K | 13 | |
| 15 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 to 7.4 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.2 to 8.4 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 to 3.0 | |
| 19 |
| Density, g/cm3 | 7.8 to 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 to 1.6 | |
| 3.6 |
| Embodied Energy, MJ/kg | 20 to 21 | |
| 51 |
| Embodied Water, L/kg | 48 to 50 | |
| 170 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 120 | |
| 200 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 330 to 410 | |
| 170 to 310 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 21 to 22 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 20 to 21 | |
| 20 to 23 |
| Thermal Diffusivity, mm2/s | 10 to 14 | |
| 4.3 |
| Thermal Shock Resistance, points | 17 to 18 | |
| 14 to 16 |