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EN 1.7221 Steel vs. EN 1.7390 Steel

Both EN 1.7221 steel and EN 1.7390 steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 1.7390 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 230
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
16
Fatigue Strength, MPa 290 to 390
310
Impact Strength: V-Notched Charpy, J 20 to 38
46
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
74
Tensile Strength: Ultimate (UTS), MPa 650 to 780
710
Tensile Strength: Yield (Proof), MPa 430 to 630
480

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 420
510
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 7.3
8.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
4.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.7
Embodied Energy, MJ/kg 20
23
Embodied Water, L/kg 51
69

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 98
100
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 1050
600
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23 to 27
25
Strength to Weight: Bending, points 21 to 24
23
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 19 to 23
20

Alloy Composition

Carbon (C), % 0.22 to 0.29
0 to 0.18
Chromium (Cr), % 0.8 to 1.2
4.0 to 6.0
Iron (Fe), % 96.8 to 98.3
91.9 to 95.3
Manganese (Mn), % 0.5 to 0.8
0.3 to 0.8
Molybdenum (Mo), % 0.15 to 0.3
0.45 to 0.65
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.6
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.015