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Grade 27 Titanium vs. AISI 317L Stainless Steel

Grade 27 titanium belongs to the titanium alloys classification, while AISI 317L stainless steel belongs to the iron alloys. There are 31 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 grade 27 titanium and the bottom bar is AISI 317L stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 27
44
Fatigue Strength, MPa 170
220
Poisson's Ratio 0.32
0.28
Reduction in Area, % 34
56
Shear Modulus, GPa 41
82
Shear Strength, MPa 180
380
Tensile Strength: Ultimate (UTS), MPa 270
550
Tensile Strength: Yield (Proof), MPa 230
250

Thermal Properties

Latent Heat of Fusion, J/g 420
290
Maximum Temperature: Mechanical, °C 320
1010
Melting Completion (Liquidus), °C 1660
1400
Melting Onset (Solidus), °C 1610
1380
Specific Heat Capacity, J/kg-K 540
470
Thermal Conductivity, W/m-K 21
14
Thermal Expansion, µm/m-K 8.7
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 37
21
Density, g/cm3 4.5
7.9
Embodied Carbon, kg CO2/kg material 33
4.3
Embodied Energy, MJ/kg 530
59
Embodied Water, L/kg 320
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
200
Resilience: Unit (Modulus of Resilience), kJ/m3 240
150
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 21
19
Thermal Diffusivity, mm2/s 8.8
3.8
Thermal Shock Resistance, points 21
12

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 0
18 to 20
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
58 to 68
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 0
11 to 15
Nitrogen (N), % 0 to 0.030
0 to 0.1
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.045
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