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EN 1.8550 Steel vs. EN 1.7767 Steel

Both EN 1.8550 steel and EN 1.7767 steel are iron alloys. 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 1.7767 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
200 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
20
Fatigue Strength, MPa 470
320 to 340
Impact Strength: V-Notched Charpy, J 34
46
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
74
Shear Strength, MPa 600
420 to 430
Tensile Strength: Ultimate (UTS), MPa 1000
670 to 690
Tensile Strength: Yield (Proof), MPa 760
460 to 500

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
480
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 40
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
4.5
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.7
2.4
Embodied Energy, MJ/kg 23
33
Embodied Water, L/kg 67
64

Common Calculations

PREN (Pitting Resistance) 2.3
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
120 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
570 to 650
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
24
Strength to Weight: Bending, points 29
22
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 29
19 to 20

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0.1 to 0.15
Chromium (Cr), % 1.5 to 1.8
2.8 to 3.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 94.4 to 96.3
93.8 to 95.8
Manganese (Mn), % 0.4 to 0.7
0.3 to 0.6
Molybdenum (Mo), % 0.15 to 0.25
0.9 to 1.1
Nickel (Ni), % 0.85 to 1.2
0 to 0.25
Niobium (Nb), % 0
0 to 0.070
Nitrogen (N), % 0
0 to 0.012
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0 to 0.4
0 to 0.15
Sulfur (S), % 0 to 0.035
0 to 0.0050
Titanium (Ti), % 0
0 to 0.030
Vanadium (V), % 0
0.2 to 0.3