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EN 1.7221 Steel vs. Nickel 725

EN 1.7221 steel belongs to the iron alloys classification, while nickel 725 belongs to the nickel alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is EN 1.7221 steel and the bottom bar is nickel 725.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 17
34
Fatigue Strength, MPa 290 to 390
260
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 650 to 780
860
Tensile Strength: Yield (Proof), MPa 430 to 630
350

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Maximum Temperature: Mechanical, °C 420
980
Melting Completion (Liquidus), °C 1460
1340
Melting Onset (Solidus), °C 1420
1270
Specific Heat Capacity, J/kg-K 470
440
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
1.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
75
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.5
13
Embodied Energy, MJ/kg 20
190
Embodied Water, L/kg 51
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 98
240
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 1050
300
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 23 to 27
28
Strength to Weight: Bending, points 21 to 24
24
Thermal Shock Resistance, points 19 to 23
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.35
Carbon (C), % 0.22 to 0.29
0 to 0.030
Chromium (Cr), % 0.8 to 1.2
19 to 22.5
Iron (Fe), % 96.8 to 98.3
2.3 to 15.3
Manganese (Mn), % 0.5 to 0.8
0 to 0.35
Molybdenum (Mo), % 0.15 to 0.3
7.0 to 9.5
Nickel (Ni), % 0
55 to 59
Niobium (Nb), % 0
2.8 to 4.0
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0 to 0.6
0 to 0.2
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
1.0 to 1.7