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EN 1.8888 Steel vs. EN 1.7378 Steel

Both EN 1.8888 steel and EN 1.7378 steel are iron alloys. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.8888 steel and the bottom bar is EN 1.7378 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
17
Fatigue Strength, MPa 470
330
Impact Strength: V-Notched Charpy, J 110
38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
74
Shear Strength, MPa 510
430
Tensile Strength: Ultimate (UTS), MPa 830
700
Tensile Strength: Yield (Proof), MPa 720
490

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Maximum Temperature: Mechanical, °C 420
460
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
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 8.1
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.7
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
2.3
Embodied Energy, MJ/kg 26
33
Embodied Water, L/kg 54
61

Common Calculations

PREN (Pitting Resistance) 2.0
5.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1370
630
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
25
Strength to Weight: Bending, points 25
22
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 24
20

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Boron (B), % 0 to 0.0050
0.0015 to 0.0070
Carbon (C), % 0 to 0.2
0.050 to 0.1
Chromium (Cr), % 0 to 1.5
2.2 to 2.6
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 91.9 to 100
94.6 to 96.1
Manganese (Mn), % 0 to 1.7
0.3 to 0.7
Molybdenum (Mo), % 0 to 0.7
0.9 to 1.1
Nickel (Ni), % 0 to 2.5
0
Niobium (Nb), % 0 to 0.060
0
Nitrogen (N), % 0 to 0.015
0 to 0.010
Phosphorus (P), % 0 to 0.020
0 to 0.020
Silicon (Si), % 0 to 0.8
0.15 to 0.45
Sulfur (S), % 0 to 0.0050
0 to 0.010
Titanium (Ti), % 0 to 0.050
0.050 to 0.1
Vanadium (V), % 0 to 0.12
0.2 to 0.3
Zirconium (Zr), % 0 to 0.15
0