ASTM A387 Grade 21 Steel vs. AWS ER90S-B9
Both ASTM A387 grade 21 steel and AWS ER90S-B9 are iron alloys. They have a moderately high 92% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is AWS ER90S-B9.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 21 | |
| 18 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 74 | |
| 75 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 590 | |
| 690 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 470 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 270 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1450 |
| Melting Onset (Solidus), °C | 1430 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 41 | |
| 25 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
| 7.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 8.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.1 | |
| 7.0 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 2.6 |
| Embodied Energy, MJ/kg | 23 | |
| 37 |
| Embodied Water, L/kg | 62 | |
| 91 |
Common Calculations
| PREN (Pitting Resistance) | 6.4 | |
| 13 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 110 | |
| 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 320 | |
| 570 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 25 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 22 |
| Thermal Diffusivity, mm2/s | 11 | |
| 6.9 |
| Thermal Shock Resistance, points | 14 to 17 | |
| 19 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.040 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0.070 to 0.13 |
| Chromium (Cr), % | 2.8 to 3.3 | |
| 8.0 to 10.5 |
| Copper (Cu), % | 0 | |
| 0 to 0.2 |
| Iron (Fe), % | 94.4 to 96 | |
| 84.4 to 90.7 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 1.2 |
| Molybdenum (Mo), % | 0.9 to 1.1 | |
| 0.85 to 1.2 |
| Nickel (Ni), % | 0 | |
| 0 to 0.8 |
| Niobium (Nb), % | 0 | |
| 0.020 to 0.1 |
| Nitrogen (N), % | 0 | |
| 0.030 to 0.070 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 0.5 | |
| 0.15 to 0.5 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.010 |
| Vanadium (V), % | 0 | |
| 0.15 to 0.3 |
| Residuals, % | 0 | |
| 0 to 0.5 |