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EN 1.8550 Steel vs. EN 1.7378 Steel

Both EN 1.8550 steel and EN 1.7378 steel are iron alloys. They have a very high 98% 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 1.7378 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
17
Fatigue Strength, MPa 470
330
Impact Strength: V-Notched Charpy, J 34
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
74
Shear Strength, MPa 600
430
Tensile Strength: Ultimate (UTS), MPa 1000
700
Tensile Strength: Yield (Proof), MPa 760
490

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 440
460
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
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
2.3
Embodied Energy, MJ/kg 23
33
Embodied Water, L/kg 67
61

Common Calculations

PREN (Pitting Resistance) 2.3
5.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
630
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
25
Strength to Weight: Bending, points 29
22
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 29
20

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0 to 0.020
Boron (B), % 0
0.0015 to 0.0070
Carbon (C), % 0.3 to 0.37
0.050 to 0.1
Chromium (Cr), % 1.5 to 1.8
2.2 to 2.6
Iron (Fe), % 94.4 to 96.3
94.6 to 96.1
Manganese (Mn), % 0.4 to 0.7
0.3 to 0.7
Molybdenum (Mo), % 0.15 to 0.25
0.9 to 1.1
Nickel (Ni), % 0.85 to 1.2
0
Nitrogen (N), % 0
0 to 0.010
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 0.4
0.15 to 0.45
Sulfur (S), % 0 to 0.035
0 to 0.010
Titanium (Ti), % 0
0.050 to 0.1
Vanadium (V), % 0
0.2 to 0.3