EN 1.7779 Steel vs. EN 1.6956 Steel
Both EN 1.7779 steel and EN 1.6956 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.
For each property being compared, the top bar is EN 1.7779 steel and the bottom bar is EN 1.6956 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 240 | |
370 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 16 | |
9.6 |
Fatigue Strength, MPa | 430 | |
680 |
Impact Strength: V-Notched Charpy, J | 38 | |
25 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Shear Strength, MPa | 500 | |
730 |
Tensile Strength: Ultimate (UTS), MPa | 810 | |
1230 |
Tensile Strength: Yield (Proof), MPa | 660 | |
1120 |
Thermal Properties
Latent Heat of Fusion, J/g | 260 | |
250 |
Maximum Temperature: Mechanical, °C | 470 | |
440 |
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 | |
46 |
Thermal Expansion, µm/m-K | 13 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
8.0 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.9 | |
9.1 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 4.0 | |
5.0 |
Density, g/cm3 | 7.8 | |
7.9 |
Embodied Carbon, kg CO2/kg material | 2.8 | |
2.2 |
Embodied Energy, MJ/kg | 41 | |
31 |
Embodied Water, L/kg | 64 | |
60 |
Common Calculations
PREN (Pitting Resistance) | 5.0 | |
2.8 |
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
110 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 1150 | |
3320 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 29 | |
43 |
Strength to Weight: Bending, points | 25 | |
32 |
Thermal Diffusivity, mm2/s | 11 | |
12 |
Thermal Shock Resistance, points | 23 | |
36 |
Alloy Composition
Aluminum (Al), % | 0 to 0.040 | |
0 |
Carbon (C), % | 0.17 to 0.23 | |
0.28 to 0.38 |
Chromium (Cr), % | 3.0 to 3.3 | |
1.0 to 1.7 |
Copper (Cu), % | 0 to 0.3 | |
0 |
Iron (Fe), % | 93.8 to 95.4 | |
92.4 to 95.3 |
Manganese (Mn), % | 0.3 to 0.5 | |
0.15 to 0.4 |
Molybdenum (Mo), % | 0.5 to 0.6 | |
0.3 to 0.6 |
Nickel (Ni), % | 0 to 0.3 | |
2.9 to 3.8 |
Phosphorus (P), % | 0 to 0.025 | |
0 to 0.035 |
Silicon (Si), % | 0.15 to 0.35 | |
0 to 0.4 |
Sulfur (S), % | 0 to 0.010 | |
0 to 0.035 |
Vanadium (V), % | 0.45 to 0.55 | |
0.080 to 0.25 |