ASTM A387 Grade 91 Class 2 vs. Grade 9 Titanium
ASTM A387 grade 91 class 2 belongs to the iron alloys classification, while grade 9 titanium belongs to the titanium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 grade 9 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 110 |
| Elongation at Break, % | 20 | |
| 11 to 17 |
| Fatigue Strength, MPa | 330 | |
| 330 to 480 |
| Poisson's Ratio | 0.28 | |
| 0.32 |
| Shear Modulus, GPa | 75 | |
| 40 |
| Shear Strength, MPa | 420 | |
| 430 to 580 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 700 to 960 |
| Tensile Strength: Yield (Proof), MPa | 470 | |
| 540 to 830 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 600 | |
| 330 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1640 |
| Melting Onset (Solidus), °C | 1420 | |
| 1590 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 550 |
| Thermal Conductivity, W/m-K | 26 | |
| 8.1 |
| Thermal Expansion, µm/m-K | 13 | |
| 9.1 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.9 | |
| 1.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 10 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 7.0 | |
| 37 |
| Density, g/cm3 | 7.8 | |
| 4.5 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 36 |
| Embodied Energy, MJ/kg | 37 | |
| 580 |
| Embodied Water, L/kg | 88 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 89 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 580 | |
| 1380 to 3220 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 35 |
| Strength to Weight: Axial, points | 24 | |
| 43 to 60 |
| Strength to Weight: Bending, points | 22 | |
| 39 to 48 |
| Thermal Diffusivity, mm2/s | 6.9 | |
| 3.3 |
| Thermal Shock Resistance, points | 19 | |
| 52 to 71 |
Alloy Composition
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| Aluminum (Al), % | 0 to 0.020 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0.080 to 0.12 | |
| 0 to 0.080 |
| Chromium (Cr), % | 8.0 to 9.5 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 87.3 to 90.3 | |
| 0 to 0.25 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 |
| Molybdenum (Mo), % | 0.85 to 1.1 | |
| 0 |
| Nickel (Ni), % | 0 to 0.4 | |
| 0 |
| Niobium (Nb), % | 0.060 to 0.1 | |
| 0 |
| Nitrogen (N), % | 0.030 to 0.070 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.15 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 |
| Silicon (Si), % | 0.2 to 0.5 | |
| 0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Titanium (Ti), % | 0 to 0.010 | |
| 92.6 to 95.5 |
| Vanadium (V), % | 0.18 to 0.25 | |
| 2.0 to 3.0 |
| Zirconium (Zr), % | 0 to 0.010 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.4 |