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EN 1.6554 Steel vs. EN 1.7221 Steel

Both EN 1.6554 steel and EN 1.7221 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.6554 steel and the bottom bar is EN 1.7221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230 to 280
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17 to 21
11 to 17
Fatigue Strength, MPa 380 to 520
290 to 390
Impact Strength: V-Notched Charpy, J 30 to 45
20 to 38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 780 to 930
650 to 780
Tensile Strength: Yield (Proof), MPa 550 to 790
430 to 630

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
420
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 40
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
2.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.5
Embodied Energy, MJ/kg 22
20
Embodied Water, L/kg 53
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 150
83 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 810 to 1650
490 to 1050
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 27 to 33
23 to 27
Strength to Weight: Bending, points 24 to 27
21 to 24
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 23 to 27
19 to 23

Alloy Composition

Carbon (C), % 0.23 to 0.28
0.22 to 0.29
Chromium (Cr), % 0.7 to 0.9
0.8 to 1.2
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 94.6 to 97.3
96.8 to 98.3
Manganese (Mn), % 0.6 to 0.9
0.5 to 0.8
Molybdenum (Mo), % 0.2 to 0.3
0.15 to 0.3
Nickel (Ni), % 1.0 to 2.0
0
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0 to 0.6
0 to 0.6
Sulfur (S), % 0 to 0.025
0 to 0.030
Vanadium (V), % 0 to 0.030
0