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Nickel 725 vs. SAE-AISI M4 Steel

Nickel 725 belongs to the nickel alloys classification, while SAE-AISI M4 steel belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is nickel 725 and the bottom bar is SAE-AISI M4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
76
Tensile Strength: Ultimate (UTS), MPa 860
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1340
1610
Melting Onset (Solidus), °C 1270
1560
Specific Heat Capacity, J/kg-K 440
440
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 75
25
Density, g/cm3 8.5
8.3
Embodied Carbon, kg CO2/kg material 13
14
Embodied Energy, MJ/kg 190
210
Embodied Water, L/kg 270
110

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 28
26 to 72
Strength to Weight: Bending, points 24
23 to 45
Thermal Shock Resistance, points 23
24 to 68

Alloy Composition

Aluminum (Al), % 0 to 0.35
0
Carbon (C), % 0 to 0.030
1.3 to 1.4
Chromium (Cr), % 19 to 22.5
3.8 to 4.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 2.3 to 15.3
75.9 to 81.4
Manganese (Mn), % 0 to 0.35
0.15 to 0.4
Molybdenum (Mo), % 7.0 to 9.5
4.3 to 5.5
Nickel (Ni), % 55 to 59
0 to 0.3
Niobium (Nb), % 2.8 to 4.0
0
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 0.2
0.2 to 0.45
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 1.0 to 1.7
0
Tungsten (W), % 0
5.3 to 6.5
Vanadium (V), % 0
3.8 to 4.5