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EN 1.6781 Steel vs. Grey Cast Iron

Both EN 1.6781 steel and grey cast iron are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
180
Elongation at Break, % 17
9.6
Fatigue Strength, MPa 450
69 to 170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
69
Tensile Strength: Ultimate (UTS), MPa 830
160 to 450
Tensile Strength: Yield (Proof), MPa 680
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1460
1380
Melting Onset (Solidus), °C 1420
1180
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 44
46
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
1.9
Density, g/cm3 7.9
7.5
Embodied Carbon, kg CO2/kg material 1.9
1.5
Embodied Energy, MJ/kg 25
21
Embodied Water, L/kg 60
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 1220
27 to 240
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
5.8 to 17
Strength to Weight: Bending, points 25
8.7 to 17
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 24
6.0 to 17

Alloy Composition

Carbon (C), % 0.15 to 0.19
3.1 to 3.4
Chromium (Cr), % 1.3 to 1.8
0
Iron (Fe), % 92.6 to 94.6
92.1 to 93.9
Manganese (Mn), % 0.55 to 0.8
0.5 to 0.7
Molybdenum (Mo), % 0.45 to 0.6
0
Nickel (Ni), % 3.0 to 3.5
0
Phosphorus (P), % 0 to 0.015
0 to 0.9
Silicon (Si), % 0 to 0.5
2.5 to 2.8
Sulfur (S), % 0 to 0.015
0 to 0.15