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EN 1.7779 Steel vs. EN 1.6773 Steel

Both EN 1.7779 steel and EN 1.6773 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 96% 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 1.6773 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
340
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
11
Fatigue Strength, MPa 430
560
Impact Strength: V-Notched Charpy, J 38
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 500
670
Tensile Strength: Ultimate (UTS), MPa 810
1120
Tensile Strength: Yield (Proof), MPa 660
910

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 470
450
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
8.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
9.2

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
1.9
Embodied Energy, MJ/kg 41
26
Embodied Water, L/kg 64
61

Common Calculations

PREN (Pitting Resistance) 5.0
3.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
2210
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
40
Strength to Weight: Bending, points 25
30
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 23
33

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.17 to 0.23
0.32 to 0.39
Chromium (Cr), % 3.0 to 3.3
1.6 to 2.0
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 93.8 to 95.4
92 to 93.9
Manganese (Mn), % 0.3 to 0.5
0.3 to 0.6
Molybdenum (Mo), % 0.5 to 0.6
0.25 to 0.45
Nickel (Ni), % 0 to 0.3
3.6 to 4.1
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.010
0 to 0.025
Vanadium (V), % 0.45 to 0.55
0