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EN 1.8201 Steel vs. EN 1.7378 Steel

Both EN 1.8201 steel and EN 1.7378 steel are iron alloys. Both are furnished in the normalized and tempered condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.8201 steel and the bottom bar is EN 1.7378 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
17
Fatigue Strength, MPa 310
330
Impact Strength: V-Notched Charpy, J 38
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
74
Shear Strength, MPa 390
430
Tensile Strength: Ultimate (UTS), MPa 630
700
Tensile Strength: Yield (Proof), MPa 450
490

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 450
460
Melting Completion (Liquidus), °C 1500
1470
Melting Onset (Solidus), °C 1450
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 40
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
4.0
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 2.5
2.3
Embodied Energy, MJ/kg 36
33
Embodied Water, L/kg 59
61

Common Calculations

PREN (Pitting Resistance) 5.7
5.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
110
Resilience: Unit (Modulus of Resilience), kJ/m3 530
630
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
25
Strength to Weight: Bending, points 20
22
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 18
20

Alloy Composition

Aluminum (Al), % 0 to 0.030
0 to 0.020
Boron (B), % 0.0010 to 0.0060
0.0015 to 0.0070
Carbon (C), % 0.040 to 0.1
0.050 to 0.1
Chromium (Cr), % 1.9 to 2.6
2.2 to 2.6
Iron (Fe), % 93.6 to 96.2
94.6 to 96.1
Manganese (Mn), % 0.1 to 0.6
0.3 to 0.7
Molybdenum (Mo), % 0.050 to 0.3
0.9 to 1.1
Niobium (Nb), % 0.020 to 0.080
0
Nitrogen (N), % 0 to 0.015
0 to 0.010
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 0 to 0.5
0.15 to 0.45
Sulfur (S), % 0 to 0.010
0 to 0.010
Titanium (Ti), % 0.0050 to 0.060
0.050 to 0.1
Tungsten (W), % 1.5 to 1.8
0
Vanadium (V), % 0.2 to 0.3
0.2 to 0.3