ASTM A369 Grade FP21 vs. AWS ER120S-1
Both ASTM A369 grade FP21 and AWS ER120S-1 are iron alloys. They have a very high 96% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is ASTM A369 grade FP21 and the bottom bar is AWS ER120S-1.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 20 | |
| 17 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 74 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 470 | |
| 930 |
| Tensile Strength: Yield (Proof), MPa | 240 | |
| 830 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 260 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1460 |
| Melting Onset (Solidus), °C | 1430 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 41 | |
| 46 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
| 7.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 9.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.0 | |
| 4.2 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 1.9 |
| Embodied Energy, MJ/kg | 23 | |
| 25 |
| Embodied Water, L/kg | 61 | |
| 56 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 80 | |
| 150 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 | |
| 1850 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 17 | |
| 33 |
| Strength to Weight: Bending, points | 17 | |
| 27 |
| Thermal Diffusivity, mm2/s | 11 | |
| 13 |
| Thermal Shock Resistance, points | 14 | |
| 27 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.1 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0 to 0.1 |
| Chromium (Cr), % | 2.7 to 3.4 | |
| 0 to 0.6 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 94.3 to 96.2 | |
| 92.4 to 96.1 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 1.4 to 1.8 |
| Molybdenum (Mo), % | 0.8 to 1.1 | |
| 0.3 to 0.65 |
| Nickel (Ni), % | 0 | |
| 2.0 to 2.8 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 0.5 | |
| 0.25 to 0.6 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 0.1 |
| Vanadium (V), % | 0 | |
| 0 to 0.030 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.1 |
| Residuals, % | 0 | |
| 0 to 0.5 |