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SAE-AISI 4140 Steel vs. 50Cr-50Ni Alloy

SAE-AISI 4140 steel belongs to the iron alloys classification, while 50Cr-50Ni alloy belongs to the otherwise unclassified metals. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is 50Cr-50Ni alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 11 to 26
5.7
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 73
84
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
620
Tensile Strength: Yield (Proof), MPa 590 to 990
390

Thermal Properties

Latent Heat of Fusion, J/g 250
350
Specific Heat Capacity, J/kg-K 470
490
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
50
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.5
7.9
Embodied Energy, MJ/kg 20
110
Embodied Water, L/kg 51
350

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
31
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
350
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 38
21
Strength to Weight: Bending, points 22 to 30
20
Thermal Shock Resistance, points 20 to 32
14

Alloy Composition

Aluminum (Al), % 0
0 to 0.25
Carbon (C), % 0.38 to 0.43
0 to 0.1
Chromium (Cr), % 0.8 to 1.1
48 to 52
Iron (Fe), % 96.8 to 97.8
0 to 1.0
Manganese (Mn), % 0.75 to 1.0
0 to 0.3
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0
44.5 to 52
Nitrogen (N), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.020
Titanium (Ti), % 0
0 to 0.5