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Titanium 6-6-2 vs. S21640 Stainless Steel

Titanium 6-6-2 belongs to the titanium alloys classification, while S21640 stainless steel belongs to the iron alloys. There are 29 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 titanium 6-6-2 and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
200
Elongation at Break, % 6.7 to 9.0
46
Fatigue Strength, MPa 590 to 670
320
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 44
78
Shear Strength, MPa 670 to 800
520
Tensile Strength: Ultimate (UTS), MPa 1140 to 1370
740
Tensile Strength: Yield (Proof), MPa 1040 to 1230
350

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 310
940
Melting Completion (Liquidus), °C 1610
1430
Melting Onset (Solidus), °C 1560
1380
Specific Heat Capacity, J/kg-K 540
480
Thermal Conductivity, W/m-K 5.5
15
Thermal Expansion, µm/m-K 9.4
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.1
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 40
17
Density, g/cm3 4.8
7.7
Embodied Carbon, kg CO2/kg material 29
3.6
Embodied Energy, MJ/kg 470
51
Embodied Water, L/kg 200
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 99
280
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 34
25
Strength to Weight: Axial, points 66 to 79
27
Strength to Weight: Bending, points 50 to 57
23
Thermal Diffusivity, mm2/s 2.1
4.0
Thermal Shock Resistance, points 75 to 90
16

Alloy Composition

Aluminum (Al), % 5.0 to 6.0
0
Carbon (C), % 0 to 0.050
0 to 0.080
Chromium (Cr), % 0
17.5 to 19.5
Copper (Cu), % 0.35 to 1.0
0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0.35 to 1.0
63 to 74.3
Manganese (Mn), % 0
3.5 to 6.5
Molybdenum (Mo), % 5.0 to 6.0
0.5 to 2.0
Nickel (Ni), % 0
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0 to 0.040
0.080 to 0.3
Oxygen (O), % 0 to 0.2
0
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 1.5 to 2.5
0
Titanium (Ti), % 82.8 to 87.8
0
Residuals, % 0 to 0.4
0