ASTM A229 Spring Steel vs. S21904 Stainless Steel
Both ASTM A229 spring steel and S21904 stainless steel are iron alloys. They have 65% of their average alloy composition in common. There are 31 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 A229 spring steel and the bottom bar is S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 490 to 550 | |
| 210 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 14 | |
| 17 to 51 |
| Fatigue Strength, MPa | 710 to 790 | |
| 380 to 550 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 78 |
| Shear Strength, MPa | 1020 to 1140 | |
| 510 to 620 |
| Tensile Strength: Ultimate (UTS), MPa | 1690 to 1890 | |
| 700 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 1100 to 1230 | |
| 390 to 910 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 980 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1400 |
| Melting Onset (Solidus), °C | 1410 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 50 | |
| 14 |
| Thermal Expansion, µm/m-K | 12 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 15 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 3.0 |
| Embodied Energy, MJ/kg | 19 | |
| 43 |
| Embodied Water, L/kg | 46 | |
| 160 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 230 | |
| 160 to 310 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3260 to 4080 | |
| 380 to 2070 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 60 to 67 | |
| 25 to 36 |
| Strength to Weight: Bending, points | 40 to 43 | |
| 23 to 29 |
| Thermal Diffusivity, mm2/s | 14 | |
| 3.8 |
| Thermal Shock Resistance, points | 54 to 60 | |
| 15 to 21 |
Alloy Composition
| Carbon (C), % | 0.55 to 0.85 | |
| 0 to 0.040 |
| Chromium (Cr), % | 0 | |
| 19 to 21.5 |
| Iron (Fe), % | 97.5 to 99 | |
| 59.5 to 67.4 |
| Manganese (Mn), % | 0.3 to 1.2 | |
| 8.0 to 10 |
| Nickel (Ni), % | 0 | |
| 5.5 to 7.5 |
| Nitrogen (N), % | 0 | |
| 0.15 to 0.4 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.045 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.030 |