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Grade Ti-Pd18 Titanium vs. AISI 431 Stainless Steel

Grade Ti-Pd18 titanium belongs to the titanium alloys classification, while AISI 431 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 320
250
Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 17
15 to 17
Fatigue Strength, MPa 350
430 to 610
Poisson's Ratio 0.32
0.28
Rockwell C Hardness 34
26
Shear Modulus, GPa 40
77
Tensile Strength: Ultimate (UTS), MPa 710
890 to 1380
Tensile Strength: Yield (Proof), MPa 540
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 410
280
Maximum Temperature: Mechanical, °C 330
850
Melting Completion (Liquidus), °C 1640
1510
Melting Onset (Solidus), °C 1590
1450
Specific Heat Capacity, J/kg-K 550
480
Thermal Conductivity, W/m-K 8.2
26
Thermal Expansion, µm/m-K 9.1
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
3.0

Otherwise Unclassified Properties

Density, g/cm3 4.5
7.7
Embodied Carbon, kg CO2/kg material 41
2.2
Embodied Energy, MJ/kg 670
31
Embodied Water, L/kg 270
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 1380
1270 to 2770
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 44
32 to 50
Strength to Weight: Bending, points 39
27 to 36
Thermal Diffusivity, mm2/s 3.3
7.0
Thermal Shock Resistance, points 52
28 to 43

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.1
0 to 0.2
Chromium (Cr), % 0
15 to 17
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
78.2 to 83.8
Manganese (Mn), % 0
0 to 1.0
Nickel (Ni), % 0 to 0.050
1.3 to 2.5
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
Vanadium (V), % 2.0 to 3.0
0
Residuals, % 0 to 0.4
0