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Grade 27 Titanium vs. AISI 329 Stainless Steel

Grade 27 titanium belongs to the titanium alloys classification, while AISI 329 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 AISI 329 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 27
17
Fatigue Strength, MPa 170
330
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 41
80
Shear Strength, MPa 180
440
Tensile Strength: Ultimate (UTS), MPa 270
710
Tensile Strength: Yield (Proof), MPa 230
540

Thermal Properties

Latent Heat of Fusion, J/g 420
300
Maximum Temperature: Mechanical, °C 320
1100
Melting Completion (Liquidus), °C 1660
1440
Melting Onset (Solidus), °C 1610
1390
Specific Heat Capacity, J/kg-K 540
480
Thermal Conductivity, W/m-K 21
16
Thermal Expansion, µm/m-K 8.7
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 37
16
Density, g/cm3 4.5
7.7
Embodied Carbon, kg CO2/kg material 33
3.1
Embodied Energy, MJ/kg 530
44
Embodied Water, L/kg 320
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
110
Resilience: Unit (Modulus of Resilience), kJ/m3 240
730
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 17
25
Strength to Weight: Bending, points 21
23
Thermal Diffusivity, mm2/s 8.8
4.3
Thermal Shock Resistance, points 21
19

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 0
23 to 28
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
63.1 to 74
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 0
2.0 to 5.0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.040
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0