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SAE-AISI 8620 Steel vs. Grade N7M Nickel

SAE-AISI 8620 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 (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8620 steel and the bottom bar is grade N7M nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 13 to 31
22
Fatigue Strength, MPa 270 to 360
190
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 73
85
Tensile Strength: Ultimate (UTS), MPa 520 to 690
590
Tensile Strength: Yield (Proof), MPa 360 to 570
310

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Maximum Temperature: Mechanical, °C 410
900
Melting Completion (Liquidus), °C 1460
1650
Melting Onset (Solidus), °C 1420
1590
Specific Heat Capacity, J/kg-K 470
390
Thermal Expansion, µm/m-K 13
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
75
Density, g/cm3 7.8
9.3
Embodied Carbon, kg CO2/kg material 1.5
16
Embodied Energy, MJ/kg 20
200
Embodied Water, L/kg 50
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86 to 150
110
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 880
220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 18 to 24
18
Strength to Weight: Bending, points 18 to 22
17
Thermal Shock Resistance, points 15 to 20
19

Alloy Composition

Carbon (C), % 0.18 to 0.23
0 to 0.070
Chromium (Cr), % 0.4 to 0.6
0 to 1.0
Iron (Fe), % 96.9 to 98
0 to 3.0
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
30 to 33
Nickel (Ni), % 0.4 to 0.7
60.9 to 70
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030