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EN 1.7378 Steel vs. EN 1.7779 Steel

Both EN 1.7378 steel and EN 1.7779 steel are iron alloys. They have a very high 99% 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 1.7779 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
240
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
16
Fatigue Strength, MPa 330
430
Impact Strength: V-Notched Charpy, J 38
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 430
500
Tensile Strength: Ultimate (UTS), MPa 700
810
Tensile Strength: Yield (Proof), MPa 490
660

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 460
470
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.3
2.8
Embodied Energy, MJ/kg 33
41
Embodied Water, L/kg 61
64

Common Calculations

PREN (Pitting Resistance) 5.8
5.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 630
1150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25
29
Strength to Weight: Bending, points 22
25
Thermal Diffusivity, mm2/s 10
11
Thermal Shock Resistance, points 20
23

Alloy Composition

Aluminum (Al), % 0 to 0.020
0 to 0.040
Boron (B), % 0.0015 to 0.0070
0
Carbon (C), % 0.050 to 0.1
0.17 to 0.23
Chromium (Cr), % 2.2 to 2.6
3.0 to 3.3
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 94.6 to 96.1
93.8 to 95.4
Manganese (Mn), % 0.3 to 0.7
0.3 to 0.5
Molybdenum (Mo), % 0.9 to 1.1
0.5 to 0.6
Nickel (Ni), % 0
0 to 0.3
Nitrogen (N), % 0 to 0.010
0
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0.15 to 0.45
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.010
Titanium (Ti), % 0.050 to 0.1
0
Vanadium (V), % 0.2 to 0.3
0.45 to 0.55