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EN 1.6773 Steel vs. EN 1.7707 Steel

Both EN 1.6773 steel and EN 1.7707 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 1.6773 steel and the bottom bar is EN 1.7707 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 340
300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
11
Fatigue Strength, MPa 560
500
Impact Strength: V-Notched Charpy, J 38
31
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 670
600
Tensile Strength: Ultimate (UTS), MPa 1120
1010
Tensile Strength: Yield (Proof), MPa 910
800

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 450
460
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 46
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
3.3
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.9
Embodied Energy, MJ/kg 26
27
Embodied Water, L/kg 61
58

Common Calculations

PREN (Pitting Resistance) 3.0
3.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
110
Resilience: Unit (Modulus of Resilience), kJ/m3 2210
1690
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 40
36
Strength to Weight: Bending, points 30
29
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 33
29

Alloy Composition

Carbon (C), % 0.32 to 0.39
0.26 to 0.34
Chromium (Cr), % 1.6 to 2.0
2.3 to 2.7
Iron (Fe), % 92 to 93.9
94.7 to 96.8
Manganese (Mn), % 0.3 to 0.6
0.4 to 0.7
Molybdenum (Mo), % 0.25 to 0.45
0.15 to 0.25
Nickel (Ni), % 3.6 to 4.1
0 to 0.6
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.025
0 to 0.035
Vanadium (V), % 0
0.1 to 0.2