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Grade 18 Titanium vs. S21603 Stainless Steel

Grade 18 titanium belongs to the titanium alloys classification, while S21603 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 18 titanium and the bottom bar is S21603 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 11 to 17
45
Fatigue Strength, MPa 330 to 480
360
Poisson's Ratio 0.32
0.28
Reduction in Area, % 23
57
Shear Modulus, GPa 40
79
Shear Strength, MPa 420 to 590
490
Tensile Strength: Ultimate (UTS), MPa 690 to 980
690
Tensile Strength: Yield (Proof), MPa 540 to 810
390

Thermal Properties

Latent Heat of Fusion, J/g 410
290
Maximum Temperature: Mechanical, °C 330
990
Melting Completion (Liquidus), °C 1640
1420
Melting Onset (Solidus), °C 1590
1380
Specific Heat Capacity, J/kg-K 550
480
Thermal Expansion, µm/m-K 9.9
17

Otherwise Unclassified Properties

Density, g/cm3 4.5
7.7
Embodied Carbon, kg CO2/kg material 41
3.6
Embodied Energy, MJ/kg 670
50
Embodied Water, L/kg 270
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 110
270
Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3110
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 43 to 61
25
Strength to Weight: Bending, points 39 to 49
22
Thermal Shock Resistance, points 47 to 67
15

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 22
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
57.6 to 67.8
Manganese (Mn), % 0
7.5 to 9.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
5.0 to 7.0
Nitrogen (N), % 0 to 0.030
0.25 to 0.5
Oxygen (O), % 0 to 0.15
0
Palladium (Pd), % 0.040 to 0.080
0
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 92.5 to 95.5
0
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0