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Grade 27 Titanium vs. S44635 Stainless Steel

Grade 27 titanium belongs to the titanium alloys classification, while S44635 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 S44635 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
210
Elongation at Break, % 27
23
Fatigue Strength, MPa 170
390
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 41
81
Shear Strength, MPa 180
450
Tensile Strength: Ultimate (UTS), MPa 270
710
Tensile Strength: Yield (Proof), MPa 230
580

Thermal Properties

Latent Heat of Fusion, J/g 420
300
Maximum Temperature: Mechanical, °C 320
1100
Melting Completion (Liquidus), °C 1660
1460
Melting Onset (Solidus), °C 1610
1420
Specific Heat Capacity, J/kg-K 540
470
Thermal Conductivity, W/m-K 21
16
Thermal Expansion, µm/m-K 8.7
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 37
22
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 33
4.4
Embodied Energy, MJ/kg 530
62
Embodied Water, L/kg 320
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
150
Resilience: Unit (Modulus of Resilience), kJ/m3 240
810
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
4.4
Thermal Shock Resistance, points 21
23

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.025
Chromium (Cr), % 0
24.5 to 26
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
61.5 to 68.5
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
3.5 to 4.5
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0 to 0.030
0 to 0.035
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
0.2 to 0.8
Residuals, % 0 to 0.4
0