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Grade 27 Titanium vs. S32808 Stainless Steel

Grade 27 titanium belongs to the titanium alloys classification, while S32808 stainless steel belongs to the iron alloys. There are 30 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 grade 27 titanium and the bottom bar is S32808 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
210
Elongation at Break, % 27
17
Fatigue Strength, MPa 170
350
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 41
81
Shear Strength, MPa 180
480
Tensile Strength: Ultimate (UTS), MPa 270
780
Tensile Strength: Yield (Proof), MPa 230
570

Thermal Properties

Latent Heat of Fusion, J/g 420
300
Maximum Temperature: Mechanical, °C 320
1100
Melting Completion (Liquidus), °C 1660
1470
Melting Onset (Solidus), °C 1610
1420
Specific Heat Capacity, J/kg-K 540
480
Thermal Conductivity, W/m-K 21
14
Thermal Expansion, µm/m-K 8.7
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 37
24
Density, g/cm3 4.5
7.9
Embodied Carbon, kg CO2/kg material 33
4.0
Embodied Energy, MJ/kg 530
57
Embodied Water, L/kg 320
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
120
Resilience: Unit (Modulus of Resilience), kJ/m3 240
790
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 17
27
Strength to Weight: Bending, points 21
24
Thermal Diffusivity, mm2/s 8.8
3.8
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 0
27 to 27.9
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
58.1 to 62.8
Manganese (Mn), % 0
0 to 1.1
Molybdenum (Mo), % 0
0.8 to 1.2
Nickel (Ni), % 0
7.0 to 8.2
Nitrogen (N), % 0 to 0.030
0.3 to 0.4
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.030
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 99 to 99.92
0
Tungsten (W), % 0
2.1 to 2.5
Residuals, % 0 to 0.4
0