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AISI 418 Stainless Steel vs. R56401 Titanium

AISI 418 stainless steel belongs to the iron alloys classification, while R56401 titanium belongs to the titanium alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is AISI 418 stainless steel and the bottom bar is R56401 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 17
9.1
Fatigue Strength, MPa 520
480
Poisson's Ratio 0.28
0.32
Reduction in Area, % 50
17
Shear Modulus, GPa 77
40
Shear Strength, MPa 680
560
Tensile Strength: Ultimate (UTS), MPa 1100
940
Tensile Strength: Yield (Proof), MPa 850
850

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 15
36
Density, g/cm3 8.0
4.5
Embodied Carbon, kg CO2/kg material 2.9
38
Embodied Energy, MJ/kg 41
610
Embodied Water, L/kg 110
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
83
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
3440
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 38
59
Strength to Weight: Bending, points 29
48
Thermal Diffusivity, mm2/s 6.7
2.9
Thermal Shock Resistance, points 40
67

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.5
Carbon (C), % 0.15 to 0.2
0 to 0.080
Chromium (Cr), % 12 to 14
0
Hydrogen (H), % 0
0 to 0.012
Iron (Fe), % 78.5 to 83.6
0 to 0.25
Manganese (Mn), % 0 to 0.5
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.8 to 2.2
0
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.13
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
88.5 to 91
Tungsten (W), % 2.5 to 3.5
0
Vanadium (V), % 0
3.5 to 4.5