ASTM A387 Grade 91 Class 2 vs. SAE-AISI 4150 Steel
Both ASTM A387 grade 91 class 2 and SAE-AISI 4150 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 SAE-AISI 4150 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 | |
| 200 to 380 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 20 | |
| 12 to 20 |
| Fatigue Strength, MPa | 330 | |
| 260 to 780 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 75 | |
| 73 |
| Shear Strength, MPa | 420 | |
| 410 to 800 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 660 to 1310 |
| Tensile Strength: Yield (Proof), MPa | 470 | |
| 380 to 1220 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 600 | |
| 420 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 26 | |
| 42 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.9 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 10 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 7.0 | |
| 2.4 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 1.5 |
| Embodied Energy, MJ/kg | 37 | |
| 20 |
| Embodied Water, L/kg | 88 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 82 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 580 | |
| 380 to 3930 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 24 | |
| 24 to 47 |
| Strength to Weight: Bending, points | 22 | |
| 22 to 34 |
| Thermal Diffusivity, mm2/s | 6.9 | |
| 11 |
| Thermal Shock Resistance, points | 19 | |
| 19 to 39 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.020 | |
| 0 |
| Carbon (C), % | 0.080 to 0.12 | |
| 0.48 to 0.53 |
| Chromium (Cr), % | 8.0 to 9.5 | |
| 0.8 to 1.1 |
| Iron (Fe), % | 87.3 to 90.3 | |
| 96.7 to 97.7 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 0.85 to 1.1 | |
| 0.15 to 0.25 |
| Nickel (Ni), % | 0 to 0.4 | |
| 0 |
| Niobium (Nb), % | 0.060 to 0.1 | |
| 0 |
| Nitrogen (N), % | 0.030 to 0.070 | |
| 0 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.2 to 0.5 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.040 |
| Titanium (Ti), % | 0 to 0.010 | |
| 0 |
| Vanadium (V), % | 0.18 to 0.25 | |
| 0 |
| Zirconium (Zr), % | 0 to 0.010 | |
| 0 |