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Grade 21 Titanium vs. S35315 Stainless Steel

Grade 21 titanium belongs to the titanium alloys classification, while S35315 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is grade 21 titanium and the bottom bar is S35315 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
200
Elongation at Break, % 9.0 to 17
46
Fatigue Strength, MPa 550 to 660
280
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 51
78
Shear Strength, MPa 550 to 790
520
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
740
Tensile Strength: Yield (Proof), MPa 870 to 1170
300

Thermal Properties

Latent Heat of Fusion, J/g 410
330
Maximum Temperature: Mechanical, °C 310
1100
Melting Completion (Liquidus), °C 1740
1370
Melting Onset (Solidus), °C 1690
1330
Specific Heat Capacity, J/kg-K 500
480
Thermal Conductivity, W/m-K 7.5
12
Thermal Expansion, µm/m-K 7.1
16

Otherwise Unclassified Properties

Base Metal Price, % relative 60
34
Density, g/cm3 5.4
7.9
Embodied Carbon, kg CO2/kg material 32
5.7
Embodied Energy, MJ/kg 490
81
Embodied Water, L/kg 180
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
270
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
230
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
25
Strength to Weight: Axial, points 46 to 69
26
Strength to Weight: Bending, points 38 to 50
23
Thermal Diffusivity, mm2/s 2.8
3.1
Thermal Shock Resistance, points 66 to 100
17

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.050
0.040 to 0.080
Cerium (Ce), % 0
0.030 to 0.1
Chromium (Cr), % 0
24 to 26
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
33.6 to 40.6
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 14 to 16
0
Nickel (Ni), % 0
34 to 36
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0.12 to 0.18
Oxygen (O), % 0 to 0.17
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.15 to 0.25
1.2 to 2.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 76 to 81.2
0
Residuals, % 0 to 0.4
0