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ACI-ASTM CF8C Steel vs. SAE-AISI H12 Steel

Both ACI-ASTM CF8C steel and SAE-AISI H12 steel are iron alloys. They have 74% 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 CF8C steel and the bottom bar is SAE-AISI H12 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
75
Tensile Strength: Ultimate (UTS), MPa 530
690 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Melting Completion (Liquidus), °C 1420
1480
Melting Onset (Solidus), °C 1430
1440
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
36
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
9.5

Otherwise Unclassified Properties

Base Metal Price, % relative 19
9.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.7
2.9
Embodied Energy, MJ/kg 53
41
Embodied Water, L/kg 150
76

Common Calculations

PREN (Pitting Resistance) 20
12
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
24 to 65
Strength to Weight: Bending, points 19
22 to 42
Thermal Diffusivity, mm2/s 4.3
9.8
Thermal Shock Resistance, points 11
22 to 60

Alloy Composition

Carbon (C), % 0 to 0.080
0.3 to 0.4
Chromium (Cr), % 18 to 21
4.8 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 61.8 to 73
87.8 to 91.7
Manganese (Mn), % 0 to 1.5
0.2 to 0.5
Molybdenum (Mo), % 0 to 0.5
1.3 to 1.8
Nickel (Ni), % 9.0 to 12
0 to 0.3
Niobium (Nb), % 0 to 1.0
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 2.0
0.8 to 1.2
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
1.0 to 1.7
Vanadium (V), % 0
0 to 0.5