ASTM A372 Grade G Steel vs. AISI 309 Stainless Steel
Both ASTM A372 grade G steel and AISI 309 stainless steel are iron alloys. They have 64% of their average alloy composition in common. 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 A372 grade G steel and the bottom bar is AISI 309 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 280 | |
| 180 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 20 to 22 | |
| 34 to 47 |
| Fatigue Strength, MPa | 310 to 380 | |
| 250 to 280 |
| Poisson's Ratio | 0.29 | |
| 0.27 |
| Shear Modulus, GPa | 73 | |
| 78 |
| Shear Strength, MPa | 410 to 570 | |
| 420 to 470 |
| Tensile Strength: Ultimate (UTS), MPa | 650 to 910 | |
| 600 to 710 |
| Tensile Strength: Yield (Proof), MPa | 430 to 550 | |
| 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 | 46 | |
| 16 |
| Thermal Expansion, µm/m-K | 13 | |
| 15 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.2 | |
| 19 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 3.6 |
| Embodied Energy, MJ/kg | 20 | |
| 51 |
| Embodied Water, L/kg | 49 | |
| 170 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 130 to 160 | |
| 200 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 500 to 810 | |
| 170 to 310 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 23 to 32 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 21 to 27 | |
| 20 to 23 |
| Thermal Diffusivity, mm2/s | 13 | |
| 4.3 |
| Thermal Shock Resistance, points | 19 to 27 | |
| 14 to 16 |
Alloy Composition
| Carbon (C), % | 0.25 to 0.35 | |
| 0 to 0.2 |
| Chromium (Cr), % | 0.4 to 0.65 | |
| 22 to 24 |
| Iron (Fe), % | 97.4 to 98.4 | |
| 58 to 66 |
| Manganese (Mn), % | 0.7 to 1.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 12 to 15 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.045 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |