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EN 1.7378 Steel vs. EN 1.8550 Steel

Both EN 1.7378 steel and EN 1.8550 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 1.7378 steel and the bottom bar is EN 1.8550 steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 460
440
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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