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Grade 27 Titanium vs. S21800 Stainless Steel

Grade 27 titanium belongs to the titanium alloys classification, while S21800 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 27 titanium and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 27
40
Fatigue Strength, MPa 170
330
Poisson's Ratio 0.32
0.28
Reduction in Area, % 34
62
Shear Modulus, GPa 41
75
Shear Strength, MPa 180
510
Tensile Strength: Ultimate (UTS), MPa 270
740
Tensile Strength: Yield (Proof), MPa 230
390

Thermal Properties

Latent Heat of Fusion, J/g 420
340
Maximum Temperature: Mechanical, °C 320
900
Melting Completion (Liquidus), °C 1660
1360
Melting Onset (Solidus), °C 1610
1310
Specific Heat Capacity, J/kg-K 540
500
Thermal Expansion, µm/m-K 8.7
16

Otherwise Unclassified Properties

Base Metal Price, % relative 37
15
Density, g/cm3 4.5
7.5
Embodied Carbon, kg CO2/kg material 33
3.1
Embodied Energy, MJ/kg 530
45
Embodied Water, L/kg 320
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
250
Resilience: Unit (Modulus of Resilience), kJ/m3 240
390
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
26
Strength to Weight: Axial, points 17
27
Strength to Weight: Bending, points 21
24
Thermal Shock Resistance, points 21
17

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.1
Chromium (Cr), % 0
16 to 18
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
59.1 to 65.4
Manganese (Mn), % 0
7.0 to 9.0
Nickel (Ni), % 0
8.0 to 9.0
Nitrogen (N), % 0 to 0.030
0.080 to 0.18
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.060
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
3.5 to 4.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0