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ACI-ASTM CF8C Steel vs. Grade 20 Titanium

ACI-ASTM CF8C steel belongs to the iron alloys classification, while grade 20 titanium belongs to the titanium alloys. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF8C steel and the bottom bar is grade 20 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
120
Elongation at Break, % 40
5.7 to 17
Fatigue Strength, MPa 220
550 to 630
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
47
Tensile Strength: Ultimate (UTS), MPa 530
900 to 1270
Tensile Strength: Yield (Proof), MPa 260
850 to 1190

Thermal Properties

Latent Heat of Fusion, J/g 300
400
Maximum Temperature: Mechanical, °C 980
370
Melting Completion (Liquidus), °C 1420
1660
Melting Onset (Solidus), °C 1430
1600
Specific Heat Capacity, J/kg-K 480
520
Thermal Expansion, µm/m-K 17
9.6

Otherwise Unclassified Properties

Density, g/cm3 7.8
5.0
Embodied Carbon, kg CO2/kg material 3.7
52
Embodied Energy, MJ/kg 53
860
Embodied Water, L/kg 150
350

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
71 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 170
2940 to 5760
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
33
Strength to Weight: Axial, points 19
50 to 70
Strength to Weight: Bending, points 19
41 to 52
Thermal Shock Resistance, points 11
55 to 77

Alloy Composition

Aluminum (Al), % 0
3.0 to 4.0
Carbon (C), % 0 to 0.080
0 to 0.050
Chromium (Cr), % 18 to 21
5.5 to 6.5
Hydrogen (H), % 0
0 to 0.020
Iron (Fe), % 61.8 to 73
0 to 0.3
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0 to 0.5
3.5 to 4.5
Nickel (Ni), % 9.0 to 12
0
Niobium (Nb), % 0 to 1.0
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.12
Palladium (Pd), % 0
0.040 to 0.080
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
71 to 77
Vanadium (V), % 0
7.5 to 8.5
Zirconium (Zr), % 0
3.5 to 4.5
Residuals, % 0
0 to 0.4