ASTM A225 Steel vs. AISI 309 Stainless Steel
Both ASTM A225 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 A225 steel and the bottom bar is AISI 309 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 to 250 | |
| 180 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 21 to 23 | |
| 34 to 47 |
| Fatigue Strength, MPa | 330 to 390 | |
| 250 to 280 |
| Poisson's Ratio | 0.29 | |
| 0.27 |
| Shear Modulus, GPa | 73 | |
| 78 |
| Shear Strength, MPa | 390 to 520 | |
| 420 to 470 |
| Tensile Strength: Ultimate (UTS), MPa | 620 to 830 | |
| 600 to 710 |
| Tensile Strength: Yield (Proof), MPa | 460 to 550 | |
| 260 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 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 | 52 | |
| 16 |
| Thermal Expansion, µm/m-K | 13 | |
| 15 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.3 | |
| 19 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 3.6 |
| Embodied Energy, MJ/kg | 24 to 25 | |
| 51 |
| Embodied Water, L/kg | 48 | |
| 170 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 to 170 | |
| 200 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 580 to 820 | |
| 170 to 310 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 22 to 29 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 21 to 25 | |
| 20 to 23 |
| Thermal Diffusivity, mm2/s | 14 | |
| 4.3 |
| Thermal Shock Resistance, points | 18 to 24 | |
| 14 to 16 |