ASTM A356 Grade 8 vs. S31730 Stainless Steel
Both ASTM A356 grade 8 and S31730 stainless steel are iron alloys. They have 60% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is ASTM A356 grade 8 and the bottom bar is S31730 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 | |
| 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 21 | |
| 40 |
| Fatigue Strength, MPa | 270 | |
| 170 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 630 | |
| 540 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 200 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 990 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1430 |
| Melting Onset (Solidus), °C | 1430 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Expansion, µm/m-K | 13 | |
| 16 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 24 |
| Density, g/cm3 | 7.8 | |
| 8.0 |
| Embodied Carbon, kg CO2/kg material | 2.0 | |
| 4.6 |
| Embodied Energy, MJ/kg | 26 | |
| 63 |
| Embodied Water, L/kg | 55 | |
| 180 |
Common Calculations
| PREN (Pitting Resistance) | 4.7 | |
| 30 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 | |
| 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 | |
| 99 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 22 | |
| 19 |
| Strength to Weight: Bending, points | 21 | |
| 18 |
| Thermal Shock Resistance, points | 18 | |
| 12 |
Alloy Composition
| Carbon (C), % | 0 to 0.2 | |
| 0 to 0.030 |
| Chromium (Cr), % | 1.0 to 1.5 | |
| 17 to 19 |
| Copper (Cu), % | 0 | |
| 4.0 to 5.0 |
| Iron (Fe), % | 95.4 to 97.4 | |
| 52.4 to 61 |
| Manganese (Mn), % | 0.5 to 0.9 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.9 to 1.2 | |
| 3.0 to 4.0 |
| Nickel (Ni), % | 0 | |
| 15 to 16.5 |
| Nitrogen (N), % | 0 | |
| 0 to 0.045 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.2 to 0.6 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Vanadium (V), % | 0.050 to 0.15 | |
| 0 |