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ACI-ASTM CN7MS Steel vs. AWS ERNiCrMo-3

ACI-ASTM CN7MS steel belongs to the iron alloys classification, while AWS ERNiCrMo-3 belongs to the nickel alloys. They have 49% of their average alloy composition in common. 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 ERNiCrMo-3.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
34
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 540
870

Thermal Properties

Latent Heat of Fusion, J/g 340
330
Melting Completion (Liquidus), °C 1400
1480
Melting Onset (Solidus), °C 1350
1430
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 12
11
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 28
80
Density, g/cm3 7.9
8.6
Embodied Carbon, kg CO2/kg material 5.1
14
Embodied Energy, MJ/kg 71
190
Embodied Water, L/kg 180
290

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 19
28
Strength to Weight: Bending, points 19
24
Thermal Diffusivity, mm2/s 3.2
2.8
Thermal Shock Resistance, points 13
25

Alloy Composition

Aluminum (Al), % 0
0 to 0.4
Carbon (C), % 0 to 0.070
0 to 0.010
Chromium (Cr), % 18 to 20
20 to 23
Copper (Cu), % 1.5 to 2.0
0 to 0.5
Iron (Fe), % 45.4 to 53.5
0 to 5.0
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 2.5 to 3.0
8.0 to 10
Nickel (Ni), % 22 to 25
58 to 68.9
Niobium (Nb), % 0
3.2 to 4.2
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 2.5 to 3.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0 to 0.4
Residuals, % 0
0 to 0.5