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ACI-ASTM CN7M Steel vs. SAE-AISI A3 Steel

Both ACI-ASTM CN7M steel and SAE-AISI A3 steel are iron alloys. They have 50% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7M steel and the bottom bar is SAE-AISI A3 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 480
700 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Melting Completion (Liquidus), °C 1410
1450
Melting Onset (Solidus), °C 1450
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 21
37
Thermal Expansion, µm/m-K 15
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
9.7

Otherwise Unclassified Properties

Base Metal Price, % relative 32
6.0
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 5.6
4.4
Embodied Energy, MJ/kg 78
67
Embodied Water, L/kg 210
78

Common Calculations

PREN (Pitting Resistance) 29
8.9
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
25 to 77
Strength to Weight: Bending, points 17
23 to 48
Thermal Diffusivity, mm2/s 5.6
10
Thermal Shock Resistance, points 12
23 to 70

Alloy Composition

Carbon (C), % 0 to 0.070
1.2 to 1.3
Chromium (Cr), % 19 to 22
4.8 to 5.5
Copper (Cu), % 3.0 to 4.0
0 to 0.25
Iron (Fe), % 37.4 to 48.5
88.7 to 92
Manganese (Mn), % 0 to 1.5
0.4 to 0.6
Molybdenum (Mo), % 2.0 to 3.0
0.9 to 1.4
Nickel (Ni), % 27.5 to 30.5
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.5
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.030
Vanadium (V), % 0
0.8 to 1.4