ASTM A387 Grade 91 Class 2 vs. ACI-ASTM CG8M Steel
Both ASTM A387 grade 91 class 2 and ACI-ASTM CG8M steel are iron alloys. They have 75% of their average alloy composition in common. There are 31 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 ACI-ASTM CG8M steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 | |
| 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 20 | |
| 45 |
| Fatigue Strength, MPa | 330 | |
| 280 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 75 | |
| 79 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 550 |
| Tensile Strength: Yield (Proof), MPa | 470 | |
| 300 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 600 | |
| 1020 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1450 |
| Melting Onset (Solidus), °C | 1420 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 26 | |
| 16 |
| Thermal Expansion, µm/m-K | 13 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.9 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 10 | |
| 2.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 7.0 | |
| 20 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 4.1 |
| Embodied Energy, MJ/kg | 37 | |
| 56 |
| Embodied Water, L/kg | 88 | |
| 160 |
Common Calculations
| PREN (Pitting Resistance) | 13 | |
| 31 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 210 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 580 | |
| 220 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 24 | |
| 19 |
| Strength to Weight: Bending, points | 22 | |
| 19 |
| Thermal Diffusivity, mm2/s | 6.9 | |
| 4.3 |
| Thermal Shock Resistance, points | 19 | |
| 12 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.020 | |
| 0 |
| Carbon (C), % | 0.080 to 0.12 | |
| 0 to 0.080 |
| Chromium (Cr), % | 8.0 to 9.5 | |
| 18 to 21 |
| Iron (Fe), % | 87.3 to 90.3 | |
| 58.8 to 70 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0.85 to 1.1 | |
| 3.0 to 4.0 |
| Nickel (Ni), % | 0 to 0.4 | |
| 9.0 to 13 |
| 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 1.5 |
| 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 |