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ACI-ASTM CF8M Steel vs. Grade 37 Titanium

ACI-ASTM CF8M steel belongs to the iron alloys classification, while grade 37 titanium belongs to the titanium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF8M steel and the bottom bar is grade 37 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 50
22
Fatigue Strength, MPa 280
170
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 78
40
Tensile Strength: Ultimate (UTS), MPa 540
390
Tensile Strength: Yield (Proof), MPa 290
250

Thermal Properties

Latent Heat of Fusion, J/g 300
420
Maximum Temperature: Mechanical, °C 1000
310
Melting Completion (Liquidus), °C 1440
1650
Melting Onset (Solidus), °C 1400
1600
Specific Heat Capacity, J/kg-K 480
550
Thermal Conductivity, W/m-K 16
21
Thermal Expansion, µm/m-K 16
8.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
6.8

Otherwise Unclassified Properties

Base Metal Price, % relative 19
36
Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 3.8
31
Embodied Energy, MJ/kg 53
500
Embodied Water, L/kg 160
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
76
Resilience: Unit (Modulus of Resilience), kJ/m3 210
280
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 19
24
Strength to Weight: Bending, points 19
26
Thermal Diffusivity, mm2/s 4.3
8.4
Thermal Shock Resistance, points 12
29

Alloy Composition

Aluminum (Al), % 0
1.0 to 2.0
Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 18 to 21
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 60.3 to 71
0 to 0.3
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 9.0 to 12
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
96.9 to 99
Residuals, % 0
0 to 0.4