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ACI-ASTM CH20 Steel vs. AWS BNi-5a

ACI-ASTM CH20 steel belongs to the iron alloys classification, while AWS BNi-5a belongs to the nickel alloys. They have a modest 34% 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 CH20 steel and the bottom bar is AWS BNi-5a.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 78
72
Tensile Strength: Ultimate (UTS), MPa 610
480

Thermal Properties

Latent Heat of Fusion, J/g 310
420
Melting Completion (Liquidus), °C 1410
1150
Melting Onset (Solidus), °C 1430
1070
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 15
12

Otherwise Unclassified Properties

Base Metal Price, % relative 20
55
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.7
9.0
Embodied Energy, MJ/kg 53
130
Embodied Water, L/kg 180
260

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
17
Strength to Weight: Bending, points 21
17
Thermal Shock Resistance, points 15
15

Alloy Composition


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Aluminum (Al), % 0
0 to 0.050
Boron (B), % 0
1.0 to 1.5
Carbon (C), % 0 to 0.2
0 to 0.1
Chromium (Cr), % 22 to 26
18.5 to 19.5
Cobalt (Co), % 0
0 to 0.1
Iron (Fe), % 54.7 to 66
0 to 0.5
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 12 to 15
70.1 to 73.5
Phosphorus (P), % 0 to 0.040
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0 to 2.0
7.0 to 7.5
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