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ACI-ASTM CA15 Steel vs. Grade 27 Titanium

ACI-ASTM CA15 steel belongs to the iron alloys classification, while grade 27 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 CA15 steel and the bottom bar is grade 27 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 21
27
Fatigue Strength, MPa 370
170
Poisson's Ratio 0.28
0.32
Reduction in Area, % 34
34
Shear Modulus, GPa 76
41
Tensile Strength: Ultimate (UTS), MPa 700
270
Tensile Strength: Yield (Proof), MPa 570
230

Thermal Properties

Latent Heat of Fusion, J/g 280
420
Maximum Temperature: Mechanical, °C 750
320
Melting Completion (Liquidus), °C 1440
1660
Melting Onset (Solidus), °C 1500
1610
Specific Heat Capacity, J/kg-K 480
540
Thermal Conductivity, W/m-K 25
21
Thermal Expansion, µm/m-K 10
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
37
Density, g/cm3 7.7
4.5
Embodied Carbon, kg CO2/kg material 2.0
33
Embodied Energy, MJ/kg 28
530
Embodied Water, L/kg 100
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
70
Resilience: Unit (Modulus of Resilience), kJ/m3 820
240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 25
17
Strength to Weight: Bending, points 23
21
Thermal Diffusivity, mm2/s 6.7
8.8
Thermal Shock Resistance, points 26
21

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 11.5 to 14
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 81.8 to 88.5
0 to 0.2
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.18
Phosphorus (P), % 0 to 0.040
0
Ruthenium (Ru), % 0
0.080 to 0.14
Silicon (Si), % 0 to 1.5
0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
99 to 99.92
Residuals, % 0
0 to 0.4