ASTM A387 Grade 2 Steel vs. ASTM A387 Grade 91 Class 2
Both ASTM A387 grade 2 steel and ASTM A387 grade 91 class 2 are iron alloys. They have a moderately high 91% of their average alloy composition in common.
For each property being compared, the top bar is ASTM A387 grade 2 steel and the bottom bar is ASTM A387 grade 91 class 2.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 140 to 170 | |
| 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 25 | |
| 20 |
| Fatigue Strength, MPa | 190 to 250 | |
| 330 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 75 |
| Shear Strength, MPa | 300 to 350 | |
| 420 |
| Tensile Strength: Ultimate (UTS), MPa | 470 to 550 | |
| 670 |
| Tensile Strength: Yield (Proof), MPa | 260 to 350 | |
| 470 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 600 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 45 | |
| 26 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 8.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 7.0 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.6 | |
| 2.6 |
| Embodied Energy, MJ/kg | 20 | |
| 37 |
| Embodied Water, L/kg | 50 | |
| 88 |
Common Calculations
| PREN (Pitting Resistance) | 2.4 | |
| 13 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 98 to 120 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 180 to 320 | |
| 580 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 16 to 20 | |
| 24 |
| Strength to Weight: Bending, points | 17 to 19 | |
| 22 |
| Thermal Diffusivity, mm2/s | 12 | |
| 6.9 |
| Thermal Shock Resistance, points | 14 to 16 | |
| 19 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.020 |
| Carbon (C), % | 0.050 to 0.21 | |
| 0.080 to 0.12 |
| Chromium (Cr), % | 0.5 to 0.8 | |
| 8.0 to 9.5 |
| Iron (Fe), % | 97.1 to 98.3 | |
| 87.3 to 90.3 |
| Manganese (Mn), % | 0.55 to 0.8 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0.45 to 0.6 | |
| 0.85 to 1.1 |
| Nickel (Ni), % | 0 | |
| 0 to 0.4 |
| Niobium (Nb), % | 0 | |
| 0.060 to 0.1 |
| Nitrogen (N), % | 0 | |
| 0.030 to 0.070 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.020 |
| Silicon (Si), % | 0.15 to 0.4 | |
| 0.2 to 0.5 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 0.010 |
| Vanadium (V), % | 0 | |
| 0.18 to 0.25 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.010 |