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EN 1.8550 Steel vs. EN 1.6773 Steel

Both EN 1.8550 steel and EN 1.6773 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 1.8550 steel and the bottom bar is EN 1.6773 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
340
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
11
Fatigue Strength, MPa 470
560
Impact Strength: V-Notched Charpy, J 34
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 600
670
Tensile Strength: Ultimate (UTS), MPa 1000
1120
Tensile Strength: Yield (Proof), MPa 760
910

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
450
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 40
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
8.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.7
1.9
Embodied Energy, MJ/kg 23
26
Embodied Water, L/kg 67
61

Common Calculations

PREN (Pitting Resistance) 2.3
3.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
2210
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
40
Strength to Weight: Bending, points 29
30
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 29
33

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0.32 to 0.39
Chromium (Cr), % 1.5 to 1.8
1.6 to 2.0
Iron (Fe), % 94.4 to 96.3
92 to 93.9
Manganese (Mn), % 0.4 to 0.7
0.3 to 0.6
Molybdenum (Mo), % 0.15 to 0.25
0.25 to 0.45
Nickel (Ni), % 0.85 to 1.2
3.6 to 4.1
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.035
0 to 0.025