AWS E3155 vs. ASTM A387 Grade 21L Class 1
Both AWS E3155 and ASTM A387 grade 21L class 1 are iron alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is AWS E3155 and the bottom bar is ASTM A387 grade 21L class 1.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 23 | |
| 21 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 74 |
| Tensile Strength: Ultimate (UTS), MPa | 770 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 260 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1470 |
| Melting Onset (Solidus), °C | 1410 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 41 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 70 | |
| 4.1 |
| Density, g/cm3 | 8.4 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 7.7 | |
| 1.8 |
| Embodied Energy, MJ/kg | 110 | |
| 23 |
| Embodied Water, L/kg | 300 | |
| 62 |
Common Calculations
| PREN (Pitting Resistance) | 35 | |
| 6.4 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 26 | |
| 18 |
| Strength to Weight: Bending, points | 22 | |
| 18 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 11 |
| Thermal Shock Resistance, points | 20 | |
| 14 |
Alloy Composition
| Carbon (C), % | 0 to 0.1 | |
| 0 to 0.1 |
| Chromium (Cr), % | 20 to 22.5 | |
| 2.8 to 3.3 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Copper (Cu), % | 0 to 0.75 | |
| 0 |
| Iron (Fe), % | 23.3 to 36.3 | |
| 94.4 to 96.1 |
| Manganese (Mn), % | 1.0 to 2.5 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 19 to 21 | |
| 0 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.025 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |