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Grade 30 Titanium vs. S31727 Stainless Steel

Grade 30 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 (9, in this case) are not shown.

For each property being compared, the top bar is grade 30 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, % 23
40
Fatigue Strength, MPa 250
240
Poisson's Ratio 0.32
0.28
Reduction in Area, % 34
56
Shear Modulus, GPa 41
78
Shear Strength, MPa 240
430
Tensile Strength: Ultimate (UTS), MPa 390
630
Tensile Strength: Yield (Proof), MPa 350
270

Thermal Properties

Latent Heat of Fusion, J/g 420
290
Maximum Temperature: Mechanical, °C 320
1010
Melting Completion (Liquidus), °C 1660
1440
Melting Onset (Solidus), °C 1610
1390
Specific Heat Capacity, J/kg-K 540
470
Thermal Expansion, µm/m-K 8.7
16

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.0
Embodied Carbon, kg CO2/kg material 36
4.7
Embodied Energy, MJ/kg 600
64
Embodied Water, L/kg 230
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86
200
Resilience: Unit (Modulus of Resilience), kJ/m3 590
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 24
22
Strength to Weight: Bending, points 26
20
Thermal Shock Resistance, points 30
14

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 0
17.5 to 19
Cobalt (Co), % 0.2 to 0.8
0
Copper (Cu), % 0
2.8 to 4.0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.3
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 0.25
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), % 98 to 99.76
0
Residuals, % 0 to 0.4
0