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ACI-ASTM CN7MS Steel vs. AWS ERNi-1

ACI-ASTM CN7MS steel belongs to the iron alloys classification, while AWS ERNi-1 belongs to the nickel alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 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 ACI-ASTM CN7MS steel and the bottom bar is AWS ERNi-1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 39
22
Poisson's Ratio 0.28
0.31
Shear Modulus, GPa 77
69
Tensile Strength: Ultimate (UTS), MPa 540
470

Thermal Properties

Latent Heat of Fusion, J/g 340
300
Melting Completion (Liquidus), °C 1400
1360
Melting Onset (Solidus), °C 1350
1310
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 12
73
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Base Metal Price, % relative 28
60
Density, g/cm3 7.9
8.7
Embodied Carbon, kg CO2/kg material 5.1
11
Embodied Energy, MJ/kg 71
150
Embodied Water, L/kg 180
230

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 19
15
Strength to Weight: Bending, points 19
15
Thermal Diffusivity, mm2/s 3.2
19
Thermal Shock Resistance, points 13
17

Alloy Composition

Aluminum (Al), % 0
0 to 1.5
Carbon (C), % 0 to 0.070
0 to 0.15
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 1.5 to 2.0
0 to 0.25
Iron (Fe), % 45.4 to 53.5
0 to 1.0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
93 to 98
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 2.5 to 3.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
2.0 to 3.5
Residuals, % 0
0 to 0.5