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Grade 25 Titanium vs. AISI 418 Stainless Steel

Grade 25 titanium belongs to the titanium alloys classification, while AISI 418 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 25 titanium and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 11
17
Fatigue Strength, MPa 550
520
Poisson's Ratio 0.32
0.28
Reduction in Area, % 29
50
Shear Modulus, GPa 40
77
Shear Strength, MPa 600
680
Tensile Strength: Ultimate (UTS), MPa 1000
1100
Tensile Strength: Yield (Proof), MPa 940
850

Thermal Properties

Latent Heat of Fusion, J/g 410
270
Maximum Temperature: Mechanical, °C 340
770
Melting Completion (Liquidus), °C 1610
1500
Melting Onset (Solidus), °C 1560
1460
Specific Heat Capacity, J/kg-K 560
470
Thermal Conductivity, W/m-K 7.1
25
Thermal Expansion, µm/m-K 9.6
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.0
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
3.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.0
Embodied Carbon, kg CO2/kg material 43
2.9
Embodied Energy, MJ/kg 700
41
Embodied Water, L/kg 320
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
170
Resilience: Unit (Modulus of Resilience), kJ/m3 4220
1830
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 62
38
Strength to Weight: Bending, points 50
29
Thermal Diffusivity, mm2/s 2.8
6.7
Thermal Shock Resistance, points 71
40

Alloy Composition

Aluminum (Al), % 5.5 to 6.8
0
Carbon (C), % 0 to 0.080
0.15 to 0.2
Chromium (Cr), % 0
12 to 14
Hydrogen (H), % 0 to 0.013
0
Iron (Fe), % 0 to 0.4
78.5 to 83.6
Manganese (Mn), % 0
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0.3 to 0.8
1.8 to 2.2
Nitrogen (N), % 0 to 0.050
0
Oxygen (O), % 0 to 0.2
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), % 86.7 to 90.6
0
Tungsten (W), % 0
2.5 to 3.5
Vanadium (V), % 3.5 to 4.5
0
Residuals, % 0 to 0.4
0