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ACI-ASTM CF8C Steel vs. AWS BNi-1a

ACI-ASTM CF8C steel belongs to the iron alloys classification, while AWS BNi-1a belongs to the nickel alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 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 ACI-ASTM CF8C steel and the bottom bar is AWS BNi-1a.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
180
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 77
70
Tensile Strength: Ultimate (UTS), MPa 530
450

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Melting Completion (Liquidus), °C 1420
1080
Melting Onset (Solidus), °C 1430
980
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 17
12

Otherwise Unclassified Properties

Base Metal Price, % relative 19
55
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 3.7
8.8
Embodied Energy, MJ/kg 53
120
Embodied Water, L/kg 150
240

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
16
Strength to Weight: Bending, points 19
16
Thermal Shock Resistance, points 11
15

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Boron (B), % 0
2.8 to 3.5
Carbon (C), % 0 to 0.080
0 to 0.060
Chromium (Cr), % 18 to 21
13 to 15
Cobalt (Co), % 0
0 to 0.1
Iron (Fe), % 61.8 to 73
4.0 to 5.0
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 9.0 to 12
70.6 to 76.3
Niobium (Nb), % 0 to 1.0
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0 to 2.0
4.0 to 5.0
Sulfur (S), % 0 to 0.040
0 to 0.020
Titanium (Ti), % 0
0 to 0.050
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5