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Grade Ti-Pd18 Titanium vs. AISI 444 Stainless Steel

Grade Ti-Pd18 titanium belongs to the titanium alloys classification, while AISI 444 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 444 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 320
190
Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 17
23
Fatigue Strength, MPa 350
210
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 40
78
Tensile Strength: Ultimate (UTS), MPa 710
470
Tensile Strength: Yield (Proof), MPa 540
310

Thermal Properties

Latent Heat of Fusion, J/g 410
290
Maximum Temperature: Mechanical, °C 330
930
Melting Completion (Liquidus), °C 1640
1460
Melting Onset (Solidus), °C 1590
1420
Specific Heat Capacity, J/kg-K 550
480
Thermal Conductivity, W/m-K 8.2
23
Thermal Expansion, µm/m-K 9.1
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.5

Otherwise Unclassified Properties

Density, g/cm3 4.5
7.7
Embodied Carbon, kg CO2/kg material 41
3.4
Embodied Energy, MJ/kg 670
47
Embodied Water, L/kg 270
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
95
Resilience: Unit (Modulus of Resilience), kJ/m3 1380
240
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 44
17
Strength to Weight: Bending, points 39
17
Thermal Diffusivity, mm2/s 3.3
6.2
Thermal Shock Resistance, points 52
16

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.1
0 to 0.025
Chromium (Cr), % 0
17.5 to 19.5
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
73.3 to 80.8
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
1.8 to 2.5
Nickel (Ni), % 0 to 0.050
0 to 1.0
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0
0 to 0.035
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 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 92.5 to 95.5
0.2 to 0.8
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0