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ACI-ASTM CF16Fa Steel vs. ACI-ASTM CF8M Steel

Both ACI-ASTM CF16Fa steel and ACI-ASTM CF8M steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CF16Fa steel and the bottom bar is ACI-ASTM CF8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
50
Fatigue Strength, MPa 170
280
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 540
540
Tensile Strength: Yield (Proof), MPa 230
290

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 980
1000
Melting Completion (Liquidus), °C 1420
1440
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 17
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.3
3.8
Embodied Energy, MJ/kg 47
53
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 21
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
230
Resilience: Unit (Modulus of Resilience), kJ/m3 140
210
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
19
Strength to Weight: Bending, points 19
19
Thermal Diffusivity, mm2/s 4.2
4.3
Thermal Shock Resistance, points 12
12

Alloy Composition

Carbon (C), % 0 to 0.16
0 to 0.080
Chromium (Cr), % 18 to 21
18 to 21
Iron (Fe), % 62.1 to 72.4
60.3 to 71
Manganese (Mn), % 0 to 1.5
0 to 1.5
Molybdenum (Mo), % 0.4 to 0.8
2.0 to 3.0
Nickel (Ni), % 9.0 to 12
9.0 to 12
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 2.0
Sulfur (S), % 0.2 to 0.4
0 to 0.040