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ACI-ASTM CF8C Steel vs. 50Cr-50Ni-Cb Alloy

ACI-ASTM CF8C steel belongs to the iron alloys classification, while 50Cr-50Ni-Cb alloy belongs to the otherwise unclassified metals. They have a modest 31% 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 (11, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF8C steel and the bottom bar is 50Cr-50Ni-Cb alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 40
5.6
Poisson's Ratio 0.28
0.26
Shear Modulus, GPa 77
84
Tensile Strength: Ultimate (UTS), MPa 530
620
Tensile Strength: Yield (Proof), MPa 260
390

Thermal Properties

Latent Heat of Fusion, J/g 300
350
Specific Heat Capacity, J/kg-K 480
480
Thermal Expansion, µm/m-K 17
15

Otherwise Unclassified Properties

Base Metal Price, % relative 19
60
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 3.7
9.2
Embodied Energy, MJ/kg 53
130
Embodied Water, L/kg 150
350

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
30
Resilience: Unit (Modulus of Resilience), kJ/m3 170
370
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
21
Strength to Weight: Bending, points 19
20
Thermal Shock Resistance, points 11
14

Alloy Composition

Aluminum (Al), % 0
0 to 0.25
Carbon (C), % 0 to 0.080
0 to 0.1
Chromium (Cr), % 18 to 21
47 to 52
Iron (Fe), % 61.8 to 73
0 to 1.0
Manganese (Mn), % 0 to 1.5
0 to 0.3
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 9.0 to 12
43.3 to 51.6
Niobium (Nb), % 0 to 1.0
1.4 to 1.7
Nitrogen (N), % 0
0 to 0.16
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.020
Titanium (Ti), % 0
0 to 0.5