ASTM A229 Spring Steel vs. ASTM A227 Spring Steel
Both ASTM A229 spring steel and ASTM A227 spring steel are iron alloys. Their average alloy composition is basically identical. There are 30 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 A227 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 490 to 550 | |
500 to 640 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 14 | |
12 |
Fatigue Strength, MPa | 710 to 790 | |
900 to 1160 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 72 | |
72 |
Shear Strength, MPa | 1020 to 1140 | |
1030 to 1330 |
Tensile Strength: Ultimate (UTS), MPa | 1690 to 1890 | |
1720 to 2220 |
Tensile Strength: Yield (Proof), MPa | 1100 to 1230 | |
1430 to 1850 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
250 |
Maximum Temperature: Mechanical, °C | 400 | |
400 |
Melting Completion (Liquidus), °C | 1450 | |
1450 |
Melting Onset (Solidus), °C | 1410 | |
1410 |
Specific Heat Capacity, J/kg-K | 470 | |
470 |
Thermal Conductivity, W/m-K | 50 | |
52 |
Thermal Expansion, µm/m-K | 12 | |
12 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
7.2 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
8.3 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 1.8 | |
1.8 |
Density, g/cm3 | 7.8 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 1.4 | |
1.4 |
Embodied Energy, MJ/kg | 19 | |
19 |
Embodied Water, L/kg | 46 | |
46 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 230 | |
200 to 260 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 60 to 67 | |
61 to 79 |
Strength to Weight: Bending, points | 40 to 43 | |
41 to 48 |
Thermal Diffusivity, mm2/s | 14 | |
14 |
Thermal Shock Resistance, points | 54 to 60 | |
55 to 71 |
Alloy Composition
Carbon (C), % | 0.55 to 0.85 | |
0.45 to 0.85 |
Iron (Fe), % | 97.5 to 99 | |
97.4 to 99.1 |
Manganese (Mn), % | 0.3 to 1.2 | |
0.3 to 1.3 |
Phosphorus (P), % | 0 to 0.040 | |
0 to 0.040 |
Silicon (Si), % | 0.15 to 0.35 | |
0.15 to 0.35 |
Sulfur (S), % | 0 to 0.050 | |
0 to 0.050 |