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Grade 27 Titanium vs. AISI 420 Stainless Steel

Grade 27 titanium belongs to the titanium alloys classification, while AISI 420 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 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 27
8.0 to 15
Fatigue Strength, MPa 170
220 to 670
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 41
76
Shear Strength, MPa 180
420 to 1010
Tensile Strength: Ultimate (UTS), MPa 270
690 to 1720
Tensile Strength: Yield (Proof), MPa 230
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 420
280
Maximum Temperature: Mechanical, °C 320
620
Melting Completion (Liquidus), °C 1660
1510
Melting Onset (Solidus), °C 1610
1450
Specific Heat Capacity, J/kg-K 540
480
Thermal Conductivity, W/m-K 21
27
Thermal Expansion, µm/m-K 8.7
10

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 240
380 to 4410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 17
25 to 62
Strength to Weight: Bending, points 21
22 to 41
Thermal Diffusivity, mm2/s 8.8
7.3
Thermal Shock Resistance, points 21
25 to 62

Alloy Composition

Carbon (C), % 0 to 0.080
0.15 to 0.4
Chromium (Cr), % 0
12 to 14
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
82.3 to 87.9
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 0.75
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 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0