EN 1.7779 Steel vs. ASTM A232 Spring Steel
Both EN 1.7779 steel and ASTM A232 spring steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 97% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is EN 1.7779 steel and the bottom bar is ASTM A232 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 240 | |
540 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 16 | |
14 |
Fatigue Strength, MPa | 430 | |
1040 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Shear Strength, MPa | 500 | |
1090 |
Tensile Strength: Ultimate (UTS), MPa | 810 | |
1790 |
Tensile Strength: Yield (Proof), MPa | 660 | |
1610 |
Thermal Properties
Latent Heat of Fusion, J/g | 260 | |
250 |
Maximum Temperature: Mechanical, °C | 470 | |
420 |
Melting Completion (Liquidus), °C | 1460 | |
1460 |
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 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
7.3 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.9 | |
8.4 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 4.0 | |
2.3 |
Density, g/cm3 | 7.8 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 2.8 | |
2.0 |
Embodied Energy, MJ/kg | 41 | |
28 |
Embodied Water, L/kg | 64 | |
51 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
250 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 29 | |
64 |
Strength to Weight: Bending, points | 25 | |
42 |
Thermal Diffusivity, mm2/s | 11 | |
14 |
Thermal Shock Resistance, points | 23 | |
53 |
Alloy Composition
Aluminum (Al), % | 0 to 0.040 | |
0 |
Carbon (C), % | 0.17 to 0.23 | |
0.48 to 0.53 |
Chromium (Cr), % | 3.0 to 3.3 | |
0.8 to 1.1 |
Copper (Cu), % | 0 to 0.3 | |
0 |
Iron (Fe), % | 93.8 to 95.4 | |
96.8 to 97.7 |
Manganese (Mn), % | 0.3 to 0.5 | |
0.7 to 0.9 |
Molybdenum (Mo), % | 0.5 to 0.6 | |
0 |
Nickel (Ni), % | 0 to 0.3 | |
0 |
Phosphorus (P), % | 0 to 0.025 | |
0 to 0.020 |
Silicon (Si), % | 0.15 to 0.35 | |
0.15 to 0.35 |
Sulfur (S), % | 0 to 0.010 | |
0 to 0.035 |
Vanadium (V), % | 0.45 to 0.55 | |
0.15 to 0.3 |