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Grade 27 Titanium vs. AISI 304 Stainless Steel

Grade 27 titanium belongs to the titanium alloys classification, while AISI 304 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 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 27
8.0 to 43
Fatigue Strength, MPa 170
210 to 440
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 41
77
Shear Strength, MPa 180
400 to 690
Tensile Strength: Ultimate (UTS), MPa 270
580 to 1180
Tensile Strength: Yield (Proof), MPa 230
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 420
290
Maximum Temperature: Mechanical, °C 320
710
Melting Completion (Liquidus), °C 1660
1450
Melting Onset (Solidus), °C 1610
1400
Specific Heat Capacity, J/kg-K 540
480
Thermal Conductivity, W/m-K 21
16
Thermal Expansion, µm/m-K 8.7
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 37
15
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 33
3.0
Embodied Energy, MJ/kg 530
43
Embodied Water, L/kg 320
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 240
140 to 1870
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 17
21 to 42
Strength to Weight: Bending, points 21
20 to 32
Thermal Diffusivity, mm2/s 8.8
4.2
Thermal Shock Resistance, points 21
12 to 25

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 0
18 to 20
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
66.5 to 74
Manganese (Mn), % 0
0 to 2.0
Nickel (Ni), % 0
8.0 to 10.5
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