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EN 1.1221 Steel vs. EN 1.6781 Steel

Both EN 1.1221 steel and EN 1.6781 steel are iron alloys. They have a very high 95% 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 1.1221 steel and the bottom bar is EN 1.6781 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 250
250
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10 to 21
17
Fatigue Strength, MPa 240 to 340
450
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 730 to 870
830
Tensile Strength: Yield (Proof), MPa 390 to 550
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 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 48
44
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
1.9
Embodied Energy, MJ/kg 19
25
Embodied Water, L/kg 47
60

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 67 to 130
130
Resilience: Unit (Modulus of Resilience), kJ/m3 410 to 800
1220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26 to 31
29
Strength to Weight: Bending, points 23 to 26
25
Thermal Diffusivity, mm2/s 13
12
Thermal Shock Resistance, points 23 to 28
24

Alloy Composition

Carbon (C), % 0.57 to 0.65
0.15 to 0.19
Chromium (Cr), % 0 to 0.4
1.3 to 1.8
Iron (Fe), % 97.1 to 98.8
92.6 to 94.6
Manganese (Mn), % 0.6 to 0.9
0.55 to 0.8
Molybdenum (Mo), % 0 to 0.1
0.45 to 0.6
Nickel (Ni), % 0 to 0.4
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