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ACI-ASTM CN3M Steel vs. SAE-AISI 8740 Steel

Both ACI-ASTM CN3M steel and SAE-AISI 8740 steel are iron alloys. They have 50% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN3M steel and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
11 to 23
Fatigue Strength, MPa 150
270 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
73
Tensile Strength: Ultimate (UTS), MPa 500
580 to 670
Tensile Strength: Yield (Proof), MPa 190
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Maximum Temperature: Mechanical, °C 1100
410
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 13
39
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 31
2.6
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 5.9
1.5
Embodied Energy, MJ/kg 80
20
Embodied Water, L/kg 200
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 89
390 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
20 to 24
Strength to Weight: Bending, points 17
20 to 22
Thermal Diffusivity, mm2/s 3.4
10
Thermal Shock Resistance, points 11
17 to 20

Alloy Composition

Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 20 to 22
0.4 to 0.6
Iron (Fe), % 42.4 to 52.5
96.5 to 97.7
Manganese (Mn), % 0 to 2.0
0.75 to 1.0
Molybdenum (Mo), % 4.5 to 5.5
0.2 to 0.3
Nickel (Ni), % 23 to 27
0.4 to 0.7
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040