EN 1.7221 Steel vs. EN 1.6220 Steel
Both EN 1.7221 steel and EN 1.6220 steel are iron alloys. They have a very high 99% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.7221 steel and the bottom bar is EN 1.6220 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 200 to 230 | |
170 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 11 to 17 | |
23 to 25 |
Fatigue Strength, MPa | 290 to 390 | |
240 to 250 |
Impact Strength: V-Notched Charpy, J | 20 to 38 | |
49 to 57 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Tensile Strength: Ultimate (UTS), MPa | 650 to 780 | |
550 to 580 |
Tensile Strength: Yield (Proof), MPa | 430 to 630 | |
340 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
250 |
Maximum Temperature: Mechanical, °C | 420 | |
400 |
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 | 44 | |
52 |
Thermal Expansion, µm/m-K | 13 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
7.3 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
8.4 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 2.4 | |
2.1 |
Density, g/cm3 | 7.8 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 1.5 | |
1.5 |
Embodied Energy, MJ/kg | 20 | |
19 |
Embodied Water, L/kg | 51 | |
48 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 83 to 98 | |
110 to 120 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 490 to 1050 | |
300 to 310 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 23 to 27 | |
19 to 20 |
Strength to Weight: Bending, points | 21 to 24 | |
19 to 20 |
Thermal Diffusivity, mm2/s | 12 | |
14 |
Thermal Shock Resistance, points | 19 to 23 | |
16 to 17 |
Alloy Composition
Carbon (C), % | 0.22 to 0.29 | |
0.17 to 0.23 |
Chromium (Cr), % | 0.8 to 1.2 | |
0 |
Iron (Fe), % | 96.8 to 98.3 | |
96.7 to 98.8 |
Manganese (Mn), % | 0.5 to 0.8 | |
1.0 to 1.6 |
Molybdenum (Mo), % | 0.15 to 0.3 | |
0 |
Nickel (Ni), % | 0 | |
0 to 0.8 |
Phosphorus (P), % | 0 to 0.025 | |
0 to 0.020 |
Silicon (Si), % | 0 to 0.6 | |
0 to 0.6 |
Sulfur (S), % | 0 to 0.030 | |
0 to 0.030 |