ASTM A227 Spring Steel vs. Chromium 33
ASTM A227 spring steel belongs to the iron alloys classification, while chromium 33 belongs to the otherwise unclassified metals. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is chromium 33.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 12 | |
| 45 |
| Poisson's Ratio | 0.29 | |
| 0.27 |
| Shear Modulus, GPa | 72 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 1720 to 2220 | |
| 850 |
| Tensile Strength: Yield (Proof), MPa | 1430 to 1850 | |
| 430 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 320 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Expansion, µm/m-K | 12 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 36 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 6.0 |
| Embodied Energy, MJ/kg | 19 | |
| 84 |
| Embodied Water, L/kg | 46 | |
| 250 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 260 | |
| 320 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 61 to 79 | |
| 30 |
| Strength to Weight: Bending, points | 41 to 48 | |
| 25 |
| Thermal Shock Resistance, points | 55 to 71 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0.45 to 0.85 | |
| 0 to 0.015 |
| Chromium (Cr), % | 0 | |
| 31 to 35 |
| Copper (Cu), % | 0 | |
| 0.3 to 1.2 |
| Iron (Fe), % | 97.4 to 99.1 | |
| 25.7 to 37.9 |
| Manganese (Mn), % | 0.3 to 1.3 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 0.5 to 2.0 |
| Nickel (Ni), % | 0 | |
| 30 to 33 |
| Nitrogen (N), % | 0 | |
| 0.35 to 0.6 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.020 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.010 |