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ACI-ASTM CA6NM Steel vs. Grade 38 Titanium

ACI-ASTM CA6NM steel belongs to the iron alloys classification, while grade 38 titanium belongs to the titanium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA6NM steel and the bottom bar is grade 38 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 17
11
Fatigue Strength, MPa 380
530
Poisson's Ratio 0.28
0.32
Reduction in Area, % 40
29
Shear Modulus, GPa 76
40
Tensile Strength: Ultimate (UTS), MPa 850
1000
Tensile Strength: Yield (Proof), MPa 620
910

Thermal Properties

Latent Heat of Fusion, J/g 280
410
Maximum Temperature: Mechanical, °C 770
330
Melting Completion (Liquidus), °C 1450
1620
Melting Onset (Solidus), °C 1400
1570
Specific Heat Capacity, J/kg-K 480
550
Thermal Conductivity, W/m-K 25
8.0
Thermal Expansion, µm/m-K 10
9.3

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
1.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
36
Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 2.5
35
Embodied Energy, MJ/kg 34
560
Embodied Water, L/kg 110
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1000
3840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 30
62
Strength to Weight: Bending, points 26
49
Thermal Diffusivity, mm2/s 6.7
3.2
Thermal Shock Resistance, points 31
72

Alloy Composition

Aluminum (Al), % 0
3.5 to 4.5
Carbon (C), % 0 to 0.060
0 to 0.080
Chromium (Cr), % 11.5 to 14
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 78.4 to 84.6
1.2 to 1.8
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 3.5 to 4.5
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0.2 to 0.3
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
89.9 to 93.1
Vanadium (V), % 0
2.0 to 3.0
Residuals, % 0
0 to 0.4