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SAE-AISI A4 Steel vs. ACI-ASTM CF8C Steel

Both SAE-AISI A4 steel and ACI-ASTM CF8C steel are iron alloys. They have 70% 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 SAE-AISI A4 steel and the bottom bar is ACI-ASTM CF8C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
530

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1450
1420
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
16
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
3.7
Embodied Energy, MJ/kg 24
53
Embodied Water, L/kg 59
150

Common Calculations

PREN (Pitting Resistance) 5.3
20
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 73
19
Strength to Weight: Bending, points 23 to 46
19
Thermal Diffusivity, mm2/s 11
4.3
Thermal Shock Resistance, points 23 to 67
11

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.080
Chromium (Cr), % 0.9 to 2.2
18 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92 to 95.5
61.8 to 73
Manganese (Mn), % 1.8 to 2.2
0 to 1.5
Molybdenum (Mo), % 0.9 to 1.4
0 to 0.5
Nickel (Ni), % 0 to 0.3
9.0 to 12
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040