ASTM A229 Spring Steel vs. Grade 18 Titanium
ASTM A229 spring steel belongs to the iron alloys classification, while grade 18 titanium belongs to the titanium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is grade 18 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 110 |
| Elongation at Break, % | 14 | |
| 11 to 17 |
| Fatigue Strength, MPa | 710 to 790 | |
| 330 to 480 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Shear Modulus, GPa | 72 | |
| 40 |
| Shear Strength, MPa | 1020 to 1140 | |
| 420 to 590 |
| Tensile Strength: Ultimate (UTS), MPa | 1690 to 1890 | |
| 690 to 980 |
| Tensile Strength: Yield (Proof), MPa | 1100 to 1230 | |
| 540 to 810 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 330 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1640 |
| Melting Onset (Solidus), °C | 1410 | |
| 1590 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 550 |
| Thermal Conductivity, W/m-K | 50 | |
| 8.3 |
| Thermal Expansion, µm/m-K | 12 | |
| 9.9 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 1.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 2.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 4.5 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 41 |
| Embodied Energy, MJ/kg | 19 | |
| 670 |
| Embodied Water, L/kg | 46 | |
| 270 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 230 | |
| 87 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3260 to 4080 | |
| 1380 to 3110 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 35 |
| Strength to Weight: Axial, points | 60 to 67 | |
| 43 to 61 |
| Strength to Weight: Bending, points | 40 to 43 | |
| 39 to 49 |
| Thermal Diffusivity, mm2/s | 14 | |
| 3.4 |
| Thermal Shock Resistance, points | 54 to 60 | |
| 47 to 67 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0.55 to 0.85 | |
| 0 to 0.080 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 97.5 to 99 | |
| 0 to 0.25 |
| Manganese (Mn), % | 0.3 to 1.2 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.15 |
| Palladium (Pd), % | 0 | |
| 0.040 to 0.080 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 92.5 to 95.5 |
| Vanadium (V), % | 0 | |
| 2.0 to 3.0 |
| Residuals, % | 0 | |
| 0 to 0.4 |