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EN 1.6781 Steel vs. EN 1.6554 Steel

Both EN 1.6781 steel and EN 1.6554 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.6781 steel and the bottom bar is EN 1.6554 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
230 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
17 to 21
Fatigue Strength, MPa 450
380 to 520
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 830
780 to 930
Tensile Strength: Yield (Proof), MPa 680
550 to 790

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 450
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
3.4
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 1.9
1.7
Embodied Energy, MJ/kg 25
22
Embodied Water, L/kg 60
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 1220
810 to 1650
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
27 to 33
Strength to Weight: Bending, points 25
24 to 27
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 24
23 to 27

Alloy Composition

Carbon (C), % 0.15 to 0.19
0.23 to 0.28
Chromium (Cr), % 1.3 to 1.8
0.7 to 0.9
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 92.6 to 94.6
94.6 to 97.3
Manganese (Mn), % 0.55 to 0.8
0.6 to 0.9
Molybdenum (Mo), % 0.45 to 0.6
0.2 to 0.3
Nickel (Ni), % 3.0 to 3.5
1.0 to 2.0
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 0.5
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.025
Vanadium (V), % 0
0 to 0.030