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SAE-AISI M4 Steel vs. Nickel 718

SAE-AISI M4 steel belongs to the iron alloys classification, while nickel 718 belongs to the nickel alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M4 steel and the bottom bar is nickel 718.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
75
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
930 to 1530

Thermal Properties

Latent Heat of Fusion, J/g 260
310
Melting Completion (Liquidus), °C 1610
1340
Melting Onset (Solidus), °C 1560
1260
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 25
11
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
75
Density, g/cm3 8.3
8.3
Embodied Carbon, kg CO2/kg material 14
13
Embodied Energy, MJ/kg 210
190
Embodied Water, L/kg 110
250

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 26 to 72
31 to 51
Strength to Weight: Bending, points 23 to 45
25 to 35
Thermal Diffusivity, mm2/s 6.9
3.0
Thermal Shock Resistance, points 24 to 68
27 to 44

Alloy Composition

Aluminum (Al), % 0
0.2 to 0.8
Boron (B), % 0
0 to 0.0060
Carbon (C), % 1.3 to 1.4
0 to 0.080
Chromium (Cr), % 3.8 to 4.8
17 to 21
Cobalt (Co), % 0
0 to 1.0
Copper (Cu), % 0 to 0.25
0 to 0.3
Iron (Fe), % 75.9 to 81.4
11.1 to 24.6
Manganese (Mn), % 0.15 to 0.4
0 to 0.35
Molybdenum (Mo), % 4.3 to 5.5
2.8 to 3.3
Nickel (Ni), % 0 to 0.3
50 to 55
Niobium (Nb), % 0
4.8 to 5.5
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0.2 to 0.45
0 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0.65 to 1.2
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0