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S31100 Stainless Steel vs. Grade 9 Titanium

S31100 stainless steel belongs to the iron alloys classification, while grade 9 titanium belongs to the titanium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is S31100 stainless steel and the bottom bar is grade 9 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 4.5
11 to 17
Fatigue Strength, MPa 330
330 to 480
Poisson's Ratio 0.27
0.32
Shear Modulus, GPa 79
40
Shear Strength, MPa 580
430 to 580
Tensile Strength: Ultimate (UTS), MPa 1000
700 to 960
Tensile Strength: Yield (Proof), MPa 710
540 to 830

Thermal Properties

Latent Heat of Fusion, J/g 300
410
Maximum Temperature: Mechanical, °C 1100
330
Melting Completion (Liquidus), °C 1420
1640
Melting Onset (Solidus), °C 1380
1590
Specific Heat Capacity, J/kg-K 480
550
Thermal Conductivity, W/m-K 16
8.1
Thermal Expansion, µm/m-K 13
9.1

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 16
37
Density, g/cm3 7.7
4.5
Embodied Carbon, kg CO2/kg material 3.1
36
Embodied Energy, MJ/kg 44
580
Embodied Water, L/kg 170
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 40
89 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1240
1380 to 3220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 36
43 to 60
Strength to Weight: Bending, points 29
39 to 48
Thermal Diffusivity, mm2/s 4.2
3.3
Thermal Shock Resistance, points 28
52 to 71

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0 to 0.060
0 to 0.080
Chromium (Cr), % 25 to 27
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 63.6 to 69
0 to 0.25
Manganese (Mn), % 0 to 1.0
0
Nickel (Ni), % 6.0 to 7.0
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.15
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0 to 0.25
92.6 to 95.5
Vanadium (V), % 0
2.0 to 3.0
Residuals, % 0
0 to 0.4