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S35140 Stainless Steel vs. Grade 21 Titanium

S35140 stainless steel belongs to the iron alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S35140 stainless steel and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
140
Elongation at Break, % 34
9.0 to 17
Fatigue Strength, MPa 250
550 to 660
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 78
51
Shear Strength, MPa 460
550 to 790
Tensile Strength: Ultimate (UTS), MPa 690
890 to 1340
Tensile Strength: Yield (Proof), MPa 310
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 300
410
Maximum Temperature: Mechanical, °C 1100
310
Melting Completion (Liquidus), °C 1420
1740
Melting Onset (Solidus), °C 1370
1690
Specific Heat Capacity, J/kg-K 470
500
Thermal Conductivity, W/m-K 14
7.5
Thermal Expansion, µm/m-K 16
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 31
60
Density, g/cm3 8.0
5.4
Embodied Carbon, kg CO2/kg material 5.5
32
Embodied Energy, MJ/kg 78
490
Embodied Water, L/kg 190
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 250
2760 to 5010
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
32
Strength to Weight: Axial, points 24
46 to 69
Strength to Weight: Bending, points 22
38 to 50
Thermal Diffusivity, mm2/s 3.7
2.8
Thermal Shock Resistance, points 16
66 to 100

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0 to 0.1
0 to 0.050
Chromium (Cr), % 20 to 22
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 44.1 to 52.7
0 to 0.4
Manganese (Mn), % 1.0 to 3.0
0
Molybdenum (Mo), % 1.0 to 2.0
14 to 16
Nickel (Ni), % 25 to 27
0
Niobium (Nb), % 0.25 to 0.75
2.2 to 3.2
Nitrogen (N), % 0.080 to 0.2
0 to 0.030
Oxygen (O), % 0
0 to 0.17
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0.15 to 0.25
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
76 to 81.2
Residuals, % 0
0 to 0.4