EN 1.7725 Steel vs. EN 1.7221 Steel
Both EN 1.7725 steel and EN 1.7221 steel are iron alloys. Their average alloy composition is basically identical. 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 EN 1.7725 steel and the bottom bar is EN 1.7221 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 250 to 300 | |
200 to 230 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 14 | |
11 to 17 |
Fatigue Strength, MPa | 390 to 550 | |
290 to 390 |
Impact Strength: V-Notched Charpy, J | 34 to 35 | |
20 to 38 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Tensile Strength: Ultimate (UTS), MPa | 830 to 1000 | |
650 to 780 |
Tensile Strength: Yield (Proof), MPa | 610 to 860 | |
430 to 630 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
250 |
Maximum Temperature: Mechanical, °C | 440 | |
420 |
Melting Completion (Liquidus), °C | 1460 | |
1460 |
Melting Onset (Solidus), °C | 1420 | |
1420 |
Specific Heat Capacity, J/kg-K | 470 | |
470 |
Thermal Conductivity, W/m-K | 39 | |
44 |
Thermal Expansion, µm/m-K | 13 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
7.3 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
8.4 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 2.9 | |
2.4 |
Density, g/cm3 | 7.8 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 1.8 | |
1.5 |
Embodied Energy, MJ/kg | 24 | |
20 |
Embodied Water, L/kg | 54 | |
51 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 130 | |
83 to 98 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 980 to 1940 | |
490 to 1050 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 29 to 35 | |
23 to 27 |
Strength to Weight: Bending, points | 25 to 28 | |
21 to 24 |
Thermal Diffusivity, mm2/s | 11 | |
12 |
Thermal Shock Resistance, points | 24 to 29 | |
19 to 23 |
Alloy Composition
Carbon (C), % | 0.27 to 0.34 | |
0.22 to 0.29 |
Chromium (Cr), % | 1.3 to 1.7 | |
0.8 to 1.2 |
Iron (Fe), % | 95.7 to 97.5 | |
96.8 to 98.3 |
Manganese (Mn), % | 0.6 to 1.0 | |
0.5 to 0.8 |
Molybdenum (Mo), % | 0.3 to 0.5 | |
0.15 to 0.3 |
Phosphorus (P), % | 0 to 0.025 | |
0 to 0.025 |
Silicon (Si), % | 0 to 0.6 | |
0 to 0.6 |
Sulfur (S), % | 0 to 0.030 | |
0 to 0.030 |
Vanadium (V), % | 0.050 to 0.15 | |
0 |