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Grade 20 Titanium vs. S31727 Stainless Steel

Grade 20 titanium belongs to the titanium alloys classification, while S31727 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 20 titanium and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
200
Elongation at Break, % 5.7 to 17
40
Fatigue Strength, MPa 550 to 630
240
Poisson's Ratio 0.32
0.28
Reduction in Area, % 23
56
Shear Modulus, GPa 47
78
Shear Strength, MPa 560 to 740
430
Tensile Strength: Ultimate (UTS), MPa 900 to 1270
630
Tensile Strength: Yield (Proof), MPa 850 to 1190
270

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 370
1010
Melting Completion (Liquidus), °C 1660
1440
Melting Onset (Solidus), °C 1600
1390
Specific Heat Capacity, J/kg-K 520
470
Thermal Expansion, µm/m-K 9.6
16

Otherwise Unclassified Properties

Density, g/cm3 5.0
8.0
Embodied Carbon, kg CO2/kg material 52
4.7
Embodied Energy, MJ/kg 860
64
Embodied Water, L/kg 350
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 150
200
Resilience: Unit (Modulus of Resilience), kJ/m3 2940 to 5760
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 33
24
Strength to Weight: Axial, points 50 to 70
22
Strength to Weight: Bending, points 41 to 52
20
Thermal Shock Resistance, points 55 to 77
14

Alloy Composition

Aluminum (Al), % 3.0 to 4.0
0
Carbon (C), % 0 to 0.050
0 to 0.030
Chromium (Cr), % 5.5 to 6.5
17.5 to 19
Copper (Cu), % 0
2.8 to 4.0
Hydrogen (H), % 0 to 0.020
0
Iron (Fe), % 0 to 0.3
53.7 to 61.3
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 3.5 to 4.5
3.8 to 4.5
Nickel (Ni), % 0
14.5 to 16.5
Nitrogen (N), % 0 to 0.030
0.15 to 0.21
Oxygen (O), % 0 to 0.12
0
Palladium (Pd), % 0.040 to 0.080
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 71 to 77
0
Vanadium (V), % 7.5 to 8.5
0
Zirconium (Zr), % 3.5 to 4.5
0
Residuals, % 0 to 0.4
0