ASTM A387 Grade 11 Steel vs. ASTM A227 Spring Steel
Both ASTM A387 grade 11 steel and ASTM A227 spring steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is ASTM A387 grade 11 steel and the bottom bar is ASTM A227 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 to 180 | |
| 500 to 640 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 25 | |
| 12 |
| Fatigue Strength, MPa | 200 to 250 | |
| 900 to 1160 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Shear Strength, MPa | 320 to 390 | |
| 1030 to 1330 |
| Tensile Strength: Ultimate (UTS), MPa | 500 to 600 | |
| 1720 to 2220 |
| Tensile Strength: Yield (Proof), MPa | 270 to 350 | |
| 1430 to 1850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 400 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1450 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 39 | |
| 52 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.9 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.6 | |
| 1.4 |
| Embodied Energy, MJ/kg | 21 | |
| 19 |
| Embodied Water, L/kg | 53 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 100 to 130 | |
| 200 to 260 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 61 to 79 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 41 to 48 |
| Thermal Diffusivity, mm2/s | 11 | |
| 14 |
| Thermal Shock Resistance, points | 15 to 18 | |
| 55 to 71 |
Alloy Composition
| Carbon (C), % | 0.050 to 0.17 | |
| 0.45 to 0.85 |
| Chromium (Cr), % | 1.0 to 1.5 | |
| 0 |
| Iron (Fe), % | 96.2 to 97.6 | |
| 97.4 to 99.1 |
| Manganese (Mn), % | 0.4 to 0.65 | |
| 0.3 to 1.3 |
| Molybdenum (Mo), % | 0.45 to 0.65 | |
| 0 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.5 to 0.8 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.050 |