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S21640 Stainless Steel vs. Grade 2 Titanium

S21640 stainless steel belongs to the iron alloys classification, while grade 2 titanium belongs to the titanium alloys. There are 31 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 S21640 stainless steel and the bottom bar is grade 2 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
150
Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 46
23
Fatigue Strength, MPa 320
250
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 78
38
Shear Strength, MPa 520
270
Tensile Strength: Ultimate (UTS), MPa 740
420
Tensile Strength: Yield (Proof), MPa 350
360

Thermal Properties

Latent Heat of Fusion, J/g 290
420
Maximum Temperature: Mechanical, °C 940
320
Melting Completion (Liquidus), °C 1430
1660
Melting Onset (Solidus), °C 1380
1610
Specific Heat Capacity, J/kg-K 480
540
Thermal Conductivity, W/m-K 15
22
Thermal Expansion, µm/m-K 17
9.0

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
7.2

Otherwise Unclassified Properties

Base Metal Price, % relative 17
37
Density, g/cm3 7.7
4.5
Embodied Carbon, kg CO2/kg material 3.6
31
Embodied Energy, MJ/kg 51
510
Embodied Water, L/kg 150
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
92
Resilience: Unit (Modulus of Resilience), kJ/m3 300
600
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 27
26
Strength to Weight: Bending, points 23
28
Thermal Diffusivity, mm2/s 4.0
8.9
Thermal Shock Resistance, points 16
32

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 17.5 to 19.5
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 63 to 74.3
0 to 0.3
Manganese (Mn), % 3.5 to 6.5
0
Molybdenum (Mo), % 0.5 to 2.0
0
Nickel (Ni), % 4.0 to 6.5
0
Niobium (Nb), % 0.1 to 1.0
0
Nitrogen (N), % 0.080 to 0.3
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.060
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
98.9 to 100
Residuals, % 0
0 to 0.4