ASTM A229 Spring Steel vs. ASTM A387 Grade 11 Steel
Both ASTM A229 spring steel and ASTM A387 grade 11 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is ASTM A387 grade 11 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 490 to 550 | |
| 150 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 14 | |
| 25 |
| Fatigue Strength, MPa | 710 to 790 | |
| 200 to 250 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 73 |
| Shear Strength, MPa | 1020 to 1140 | |
| 320 to 390 |
| Tensile Strength: Ultimate (UTS), MPa | 1690 to 1890 | |
| 500 to 600 |
| Tensile Strength: Yield (Proof), MPa | 1100 to 1230 | |
| 270 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 430 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 50 | |
| 39 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 2.9 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.6 |
| Embodied Energy, MJ/kg | 19 | |
| 21 |
| Embodied Water, L/kg | 46 | |
| 53 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 230 | |
| 100 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3260 to 4080 | |
| 200 to 320 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 60 to 67 | |
| 18 to 21 |
| Strength to Weight: Bending, points | 40 to 43 | |
| 18 to 20 |
| Thermal Diffusivity, mm2/s | 14 | |
| 11 |
| Thermal Shock Resistance, points | 54 to 60 | |
| 15 to 18 |
Alloy Composition
| Carbon (C), % | 0.55 to 0.85 | |
| 0.050 to 0.17 |
| Chromium (Cr), % | 0 | |
| 1.0 to 1.5 |
| Iron (Fe), % | 97.5 to 99 | |
| 96.2 to 97.6 |
| Manganese (Mn), % | 0.3 to 1.2 | |
| 0.4 to 0.65 |
| Molybdenum (Mo), % | 0 | |
| 0.45 to 0.65 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.025 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0.5 to 0.8 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.025 |