AISI 440A Stainless Steel vs. ASTM A387 Grade 12 Steel
Both AISI 440A stainless steel and ASTM A387 grade 12 steel are iron alloys. They have 83% of their average alloy composition in common. There are 30 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 AISI 440A stainless steel and the bottom bar is ASTM A387 grade 12 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 5.0 to 20 | |
| 25 |
| Fatigue Strength, MPa | 270 to 790 | |
| 190 to 230 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 73 |
| Shear Strength, MPa | 450 to 1040 | |
| 300 to 330 |
| Tensile Strength: Ultimate (UTS), MPa | 730 to 1790 | |
| 470 to 520 |
| Tensile Strength: Yield (Proof), MPa | 420 to 1650 | |
| 260 to 310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 760 | |
| 430 |
| Melting Completion (Liquidus), °C | 1480 | |
| 1470 |
| Melting Onset (Solidus), °C | 1370 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 23 | |
| 44 |
| Thermal Expansion, µm/m-K | 10 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.0 | |
| 2.8 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 1.6 |
| Embodied Energy, MJ/kg | 31 | |
| 21 |
| Embodied Water, L/kg | 120 | |
| 51 |
Common Calculations
| PREN (Pitting Resistance) | 18 | |
| 2.7 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 120 | |
| 98 to 110 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 26 to 65 | |
| 16 to 18 |
| Strength to Weight: Bending, points | 23 to 43 | |
| 17 to 18 |
| Thermal Diffusivity, mm2/s | 6.2 | |
| 12 |
| Thermal Shock Resistance, points | 26 to 65 | |
| 14 to 15 |
Alloy Composition
| Carbon (C), % | 0.6 to 0.75 | |
| 0.050 to 0.17 |
| Chromium (Cr), % | 16 to 18 | |
| 0.8 to 1.2 |
| Iron (Fe), % | 78.4 to 83.4 | |
| 97 to 98.2 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.4 to 0.65 |
| Molybdenum (Mo), % | 0 to 0.75 | |
| 0.45 to 0.6 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.4 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.025 |