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Grade Ti-Pd18 Titanium vs. AISI 418 Stainless Steel

Grade Ti-Pd18 titanium belongs to the titanium alloys classification, while AISI 418 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is grade Ti-Pd18 titanium and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 320
330
Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 17
17
Fatigue Strength, MPa 350
520
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 40
77
Tensile Strength: Ultimate (UTS), MPa 710
1100
Tensile Strength: Yield (Proof), MPa 540
850

Thermal Properties

Latent Heat of Fusion, J/g 410
270
Maximum Temperature: Mechanical, °C 330
770
Melting Completion (Liquidus), °C 1640
1500
Melting Onset (Solidus), °C 1590
1460
Specific Heat Capacity, J/kg-K 550
470
Thermal Conductivity, W/m-K 8.2
25
Thermal Expansion, µm/m-K 9.1
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
3.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.0
Embodied Carbon, kg CO2/kg material 41
2.9
Embodied Energy, MJ/kg 670
41
Embodied Water, L/kg 270
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
170
Resilience: Unit (Modulus of Resilience), kJ/m3 1380
1830
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 44
38
Strength to Weight: Bending, points 39
29
Thermal Diffusivity, mm2/s 3.3
6.7
Thermal Shock Resistance, points 52
40

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.1
0.15 to 0.2
Chromium (Cr), % 0
12 to 14
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
78.5 to 83.6
Manganese (Mn), % 0
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.050
1.8 to 2.2
Oxygen (O), % 0 to 0.15
0
Palladium (Pd), % 0.040 to 0.080
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 92.5 to 95.5
0
Tungsten (W), % 0
2.5 to 3.5
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0