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ACI-ASTM CF20 Steel vs. Grade N7M Nickel

ACI-ASTM CF20 steel belongs to the iron alloys classification, while grade N7M nickel belongs to the nickel alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF20 steel and the bottom bar is grade N7M nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 50
22
Fatigue Strength, MPa 240
190
Poisson's Ratio 0.28
0.31
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 530
590
Tensile Strength: Yield (Proof), MPa 250
310

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Maximum Temperature: Mechanical, °C 970
900
Melting Completion (Liquidus), °C 1420
1650
Melting Onset (Solidus), °C 1410
1590
Specific Heat Capacity, J/kg-K 480
390
Thermal Expansion, µm/m-K 17
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 16
75
Density, g/cm3 7.8
9.3
Embodied Carbon, kg CO2/kg material 3.1
16
Embodied Energy, MJ/kg 44
200
Embodied Water, L/kg 150
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
110
Resilience: Unit (Modulus of Resilience), kJ/m3 160
220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 19
18
Strength to Weight: Bending, points 19
17
Thermal Shock Resistance, points 11
19

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.070
Chromium (Cr), % 18 to 21
0 to 1.0
Iron (Fe), % 64.2 to 74
0 to 3.0
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0
30 to 33
Nickel (Ni), % 8.0 to 11
60.9 to 70
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030