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AWS E240 vs. ACI-ASTM CN7M Steel

Both AWS E240 and ACI-ASTM CN7M steel are iron alloys. They have 68% 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 AWS E240 and the bottom bar is ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
44
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 770
480

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Melting Completion (Liquidus), °C 1390
1410
Melting Onset (Solidus), °C 1350
1450
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
21
Thermal Expansion, µm/m-K 15
15

Otherwise Unclassified Properties

Base Metal Price, % relative 14
32
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 3.0
5.6
Embodied Energy, MJ/kg 42
78
Embodied Water, L/kg 160
210

Common Calculations

PREN (Pitting Resistance) 22
29
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28
17
Strength to Weight: Bending, points 24
17
Thermal Diffusivity, mm2/s 3.9
5.6
Thermal Shock Resistance, points 19
12

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.070
Chromium (Cr), % 17 to 19
19 to 22
Copper (Cu), % 0 to 0.75
3.0 to 4.0
Iron (Fe), % 58.6 to 68.4
37.4 to 48.5
Manganese (Mn), % 10.5 to 13.5
0 to 1.5
Molybdenum (Mo), % 0 to 0.75
2.0 to 3.0
Nickel (Ni), % 4.0 to 6.0
27.5 to 30.5
Nitrogen (N), % 0.1 to 0.3
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040