ASTM A356 Grade 8 vs. ASTM A356 Grade 5
Both ASTM A356 grade 8 and ASTM A356 grade 5 are iron alloys. Both are furnished in the heat treated (HT) condition. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is ASTM A356 grade 8 and the bottom bar is ASTM A356 grade 5.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 | |
| 170 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 21 | |
| 25 |
| Fatigue Strength, MPa | 270 | |
| 230 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 50 | |
| 39 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 630 | |
| 550 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 420 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1470 |
| Melting Onset (Solidus), °C | 1430 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 38 | |
| 49 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 2.6 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.0 | |
| 1.5 |
| Embodied Energy, MJ/kg | 26 | |
| 20 |
| Embodied Water, L/kg | 55 | |
| 49 |
Common Calculations
| PREN (Pitting Resistance) | 4.7 | |
| 2.2 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 | |
| 250 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 22 | |
| 20 |
| Strength to Weight: Bending, points | 21 | |
| 19 |
| Thermal Diffusivity, mm2/s | 10 | |
| 13 |
| Thermal Shock Resistance, points | 18 | |
| 16 |
Alloy Composition
| Carbon (C), % | 0 to 0.2 | |
| 0 to 0.25 |
| Chromium (Cr), % | 1.0 to 1.5 | |
| 0.4 to 0.7 |
| Iron (Fe), % | 95.4 to 97.4 | |
| 97.1 to 99.2 |
| Manganese (Mn), % | 0.5 to 0.9 | |
| 0 to 0.7 |
| Molybdenum (Mo), % | 0.9 to 1.2 | |
| 0.4 to 0.6 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.2 to 0.6 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Vanadium (V), % | 0.050 to 0.15 | |
| 0 |