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EN 1.7221 Steel vs. EN 1.6781 Steel

Both EN 1.7221 steel and EN 1.6781 steel are iron alloys. They have a very high 96% 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 1.7221 steel and the bottom bar is EN 1.6781 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 230
250
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
17
Fatigue Strength, MPa 290 to 390
450
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 650 to 780
830
Tensile Strength: Yield (Proof), MPa 430 to 630
680

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 420
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 44
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
1.9
Embodied Energy, MJ/kg 20
25
Embodied Water, L/kg 51
60

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 98
130
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 1050
1220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 27
29
Strength to Weight: Bending, points 21 to 24
25
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 19 to 23
24

Alloy Composition

Carbon (C), % 0.22 to 0.29
0.15 to 0.19
Chromium (Cr), % 0.8 to 1.2
1.3 to 1.8
Iron (Fe), % 96.8 to 98.3
92.6 to 94.6
Manganese (Mn), % 0.5 to 0.8
0.55 to 0.8
Molybdenum (Mo), % 0.15 to 0.3
0.45 to 0.6
Nickel (Ni), % 0
3.0 to 3.5
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0 to 0.6
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015