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SAE-AISI 1078 Steel vs. ACI-ASTM CF3MN Steel

Both SAE-AISI 1078 steel and ACI-ASTM CF3MN steel are iron alloys. They have 66% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1078 steel and the bottom bar is ACI-ASTM CF3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 14
39
Fatigue Strength, MPa 270 to 350
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Tensile Strength: Ultimate (UTS), MPa 730 to 780
580
Tensile Strength: Yield (Proof), MPa 430 to 570
290

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1010
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 49
15
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
3.9
Embodied Energy, MJ/kg 18
53
Embodied Water, L/kg 45
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 90
190
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 860
210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 28
20
Strength to Weight: Bending, points 23 to 24
20
Thermal Diffusivity, mm2/s 13
4.1
Thermal Shock Resistance, points 25 to 26
13

Alloy Composition

Carbon (C), % 0.72 to 0.85
0 to 0.030
Chromium (Cr), % 0
17 to 22
Iron (Fe), % 98.5 to 99
58.7 to 71.9
Manganese (Mn), % 0.3 to 0.6
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
9.0 to 13
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.5
Sulfur (S), % 0 to 0.050
0 to 0.040