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ACI-ASTM CN7MS Steel vs. AWS E309Nb

Both ACI-ASTM CN7MS steel and AWS E309Nb are iron alloys. They have 83% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, 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 E309Nb.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
34
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 540
620

Thermal Properties

Latent Heat of Fusion, J/g 340
300
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1350
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 28
25
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 5.1
4.4
Embodied Energy, MJ/kg 71
64
Embodied Water, L/kg 180
180

Common Calculations

PREN (Pitting Resistance) 28
25
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
22
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 13
16

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.12
Chromium (Cr), % 18 to 20
22 to 25
Copper (Cu), % 1.5 to 2.0
0 to 0.75
Iron (Fe), % 45.4 to 53.5
54.8 to 64.8
Manganese (Mn), % 0 to 1.0
0.5 to 2.5
Molybdenum (Mo), % 2.5 to 3.0
0 to 0.75
Nickel (Ni), % 22 to 25
12 to 14
Niobium (Nb), % 0
0.7 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 2.5 to 3.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030