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EN 1.1121 Steel vs. EN 1.6781 Steel

Both EN 1.1121 steel and EN 1.6781 steel are iron alloys. They have a moderately high 94% 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 1.1121 steel and the bottom bar is EN 1.6781 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
250
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 28
17
Fatigue Strength, MPa 160
450
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 400
830
Tensile Strength: Yield (Proof), MPa 210
680

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 400
450
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 53
44
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.9
Embodied Energy, MJ/kg 18
25
Embodied Water, L/kg 45
60

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 93
130
Resilience: Unit (Modulus of Resilience), kJ/m3 110
1220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 14
29
Strength to Weight: Bending, points 15
25
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 13
24

Alloy Composition

Carbon (C), % 0.070 to 0.13
0.15 to 0.19
Chromium (Cr), % 0
1.3 to 1.8
Iron (Fe), % 98.8 to 99.63
92.6 to 94.6
Manganese (Mn), % 0.3 to 0.6
0.55 to 0.8
Molybdenum (Mo), % 0
0.45 to 0.6
Nickel (Ni), % 0
3.0 to 3.5
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.035
0 to 0.015