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EN 1.7378 Steel vs. EN 1.7709 Steel

Both EN 1.7378 steel and EN 1.7709 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is EN 1.7378 steel and the bottom bar is EN 1.7709 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 700
650 to 780

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 460
440
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
33
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.6

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
2.3
Embodied Energy, MJ/kg 33
32
Embodied Water, L/kg 61
56

Common Calculations

PREN (Pitting Resistance) 5.8
3.6
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25
23 to 27
Strength to Weight: Bending, points 22
21 to 24
Thermal Diffusivity, mm2/s 10
8.9
Thermal Shock Resistance, points 20
22 to 26

Alloy Composition

Aluminum (Al), % 0 to 0.020
0 to 0.030
Boron (B), % 0.0015 to 0.0070
0
Carbon (C), % 0.050 to 0.1
0.17 to 0.25
Chromium (Cr), % 2.2 to 2.6
1.2 to 1.5
Iron (Fe), % 94.6 to 96.1
95.2 to 97.5
Manganese (Mn), % 0.3 to 0.7
0.4 to 0.8
Molybdenum (Mo), % 0.9 to 1.1
0.55 to 0.8
Nickel (Ni), % 0
0 to 0.6
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 0.030
Titanium (Ti), % 0.050 to 0.1
0
Vanadium (V), % 0.2 to 0.3
0.2 to 0.35