ASTM A387 Grade 91 Class 2 vs. AWS E430
Both ASTM A387 grade 91 class 2 and AWS E430 are iron alloys. They have a moderately high 92% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is ASTM A387 grade 91 class 2 and the bottom bar is AWS E430.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 20 | |
| 23 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 75 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 280 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1440 |
| Melting Onset (Solidus), °C | 1420 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 26 | |
| 25 |
| Thermal Expansion, µm/m-K | 13 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.9 | |
| 2.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 10 | |
| 3.2 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 7.0 | |
| 9.0 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 2.2 |
| Embodied Energy, MJ/kg | 37 | |
| 31 |
| Embodied Water, L/kg | 88 | |
| 120 |
Common Calculations
| PREN (Pitting Resistance) | 13 | |
| 18 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 24 | |
| 18 |
| Strength to Weight: Bending, points | 22 | |
| 18 |
| Thermal Diffusivity, mm2/s | 6.9 | |
| 6.7 |
| Thermal Shock Resistance, points | 19 | |
| 13 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.020 | |
| 0 |
| Carbon (C), % | 0.080 to 0.12 | |
| 0 to 0.1 |
| Chromium (Cr), % | 8.0 to 9.5 | |
| 15 to 18 |
| Copper (Cu), % | 0 | |
| 0 to 0.75 |
| Iron (Fe), % | 87.3 to 90.3 | |
| 77.8 to 85 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.85 to 1.1 | |
| 0 to 0.75 |
| Nickel (Ni), % | 0 to 0.4 | |
| 0 to 0.6 |
| Niobium (Nb), % | 0.060 to 0.1 | |
| 0 |
| Nitrogen (N), % | 0.030 to 0.070 | |
| 0 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.2 to 0.5 | |
| 0 to 0.9 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 to 0.010 | |
| 0 |
| Vanadium (V), % | 0.18 to 0.25 | |
| 0 |
| Zirconium (Zr), % | 0 to 0.010 | |
| 0 |