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Grade 21 Titanium vs. S35135 Stainless Steel

Grade 21 titanium belongs to the titanium alloys classification, while S35135 stainless steel belongs to the iron alloys. There are 26 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 21 titanium and the bottom bar is S35135 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
200
Elongation at Break, % 9.0 to 17
34
Fatigue Strength, MPa 550 to 660
180
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 51
79
Shear Strength, MPa 550 to 790
390
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
590
Tensile Strength: Yield (Proof), MPa 870 to 1170
230

Thermal Properties

Latent Heat of Fusion, J/g 410
320
Maximum Temperature: Mechanical, °C 310
1100
Melting Completion (Liquidus), °C 1740
1430
Melting Onset (Solidus), °C 1690
1380
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 7.1
16

Otherwise Unclassified Properties

Base Metal Price, % relative 60
37
Density, g/cm3 5.4
8.1
Embodied Carbon, kg CO2/kg material 32
6.8
Embodied Energy, MJ/kg 490
94
Embodied Water, L/kg 180
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
160
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 32
24
Strength to Weight: Axial, points 46 to 69
20
Strength to Weight: Bending, points 38 to 50
19
Thermal Shock Resistance, points 66 to 100
13

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.050
0 to 0.080
Chromium (Cr), % 0
20 to 25
Copper (Cu), % 0
0 to 0.75
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
28.3 to 45
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 14 to 16
4.0 to 4.8
Nickel (Ni), % 0
30 to 38
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0.15 to 0.25
0.6 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 76 to 81.2
0.4 to 1.0
Residuals, % 0 to 0.4
0