ASTM A387 Grade 91 Class 2 vs. AWS BNi-5
ASTM A387 grade 91 class 2 belongs to the iron alloys classification, while AWS BNi-5 belongs to the nickel alloys. There are 19 material properties with values for both materials. Properties with values for just one material (14, 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 BNi-5.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 470 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 470 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1140 |
| Melting Onset (Solidus), °C | 1420 | |
| 1080 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 510 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 7.0 | |
| 55 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 8.9 |
| Embodied Energy, MJ/kg | 37 | |
| 130 |
| Embodied Water, L/kg | 88 | |
| 260 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 24 | |
| 17 |
| Strength to Weight: Bending, points | 22 | |
| 17 |
| Thermal Shock Resistance, points | 19 | |
| 15 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.020 | |
| 0 to 0.050 |
| Boron (B), % | 0 | |
| 0 to 0.030 |
| Carbon (C), % | 0.080 to 0.12 | |
| 0 to 0.060 |
| Chromium (Cr), % | 8.0 to 9.5 | |
| 18.5 to 19.5 |
| Cobalt (Co), % | 0 | |
| 0 to 0.1 |
| Iron (Fe), % | 87.3 to 90.3 | |
| 0 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 |
| Molybdenum (Mo), % | 0.85 to 1.1 | |
| 0 |
| Nickel (Ni), % | 0 to 0.4 | |
| 69.1 to 71.8 |
| Niobium (Nb), % | 0.060 to 0.1 | |
| 0 |
| Nitrogen (N), % | 0.030 to 0.070 | |
| 0 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.020 |
| Selenium (Se), % | 0 | |
| 0 to 0.0050 |
| Silicon (Si), % | 0.2 to 0.5 | |
| 9.8 to 10.5 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.020 |
| Titanium (Ti), % | 0 to 0.010 | |
| 0 to 0.050 |
| Vanadium (V), % | 0.18 to 0.25 | |
| 0 |
| Zirconium (Zr), % | 0 to 0.010 | |
| 0 to 0.050 |
| Residuals, % | 0 | |
| 0 to 0.5 |