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SAE-AISI 8740 Steel vs. 50Cr-50Ni Alloy

SAE-AISI 8740 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 8740 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 23
5.7
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 73
84
Tensile Strength: Ultimate (UTS), MPa 580 to 670
620
Tensile Strength: Yield (Proof), MPa 380 to 570
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 2.6
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 50
350

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
31
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
350
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 20 to 24
21
Strength to Weight: Bending, points 20 to 22
20
Thermal Shock Resistance, points 17 to 20
14

Alloy Composition

Aluminum (Al), % 0
0 to 0.25
Carbon (C), % 0.38 to 0.43
0 to 0.1
Chromium (Cr), % 0.4 to 0.6
48 to 52
Iron (Fe), % 96.5 to 97.7
0 to 1.0
Manganese (Mn), % 0.75 to 1.0
0 to 0.3
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 0.4 to 0.7
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