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Grade 9 Titanium vs. S31727 Stainless Steel

Grade 9 titanium belongs to the titanium alloys classification, while S31727 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is grade 9 titanium and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 11 to 17
40
Fatigue Strength, MPa 330 to 480
240
Poisson's Ratio 0.32
0.28
Reduction in Area, % 28
56
Shear Modulus, GPa 40
78
Shear Strength, MPa 430 to 580
430
Tensile Strength: Ultimate (UTS), MPa 700 to 960
630
Tensile Strength: Yield (Proof), MPa 540 to 830
270

Thermal Properties

Latent Heat of Fusion, J/g 410
290
Maximum Temperature: Mechanical, °C 330
1010
Melting Completion (Liquidus), °C 1640
1440
Melting Onset (Solidus), °C 1590
1390
Specific Heat Capacity, J/kg-K 550
470
Thermal Expansion, µm/m-K 9.1
16

Otherwise Unclassified Properties

Base Metal Price, % relative 37
24
Density, g/cm3 4.5
8.0
Embodied Carbon, kg CO2/kg material 36
4.7
Embodied Energy, MJ/kg 580
64
Embodied Water, L/kg 150
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 110
200
Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3220
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 43 to 60
22
Strength to Weight: Bending, points 39 to 48
20
Thermal Shock Resistance, points 52 to 71
14

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 0
17.5 to 19
Copper (Cu), % 0
2.8 to 4.0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
53.7 to 61.3
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
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 0.15
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 92.6 to 95.5
0
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0