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S21640 Stainless Steel vs. Grade 27 Titanium

S21640 stainless steel belongs to the iron alloys classification, while grade 27 titanium belongs to the titanium 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 S21640 stainless steel and the bottom bar is grade 27 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 46
27
Fatigue Strength, MPa 320
170
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 78
41
Shear Strength, MPa 520
180
Tensile Strength: Ultimate (UTS), MPa 740
270
Tensile Strength: Yield (Proof), MPa 350
230

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
21
Thermal Expansion, µm/m-K 17
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 17
37
Density, g/cm3 7.7
4.5
Embodied Carbon, kg CO2/kg material 3.6
33
Embodied Energy, MJ/kg 51
530
Embodied Water, L/kg 150
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
70
Resilience: Unit (Modulus of Resilience), kJ/m3 300
240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 27
17
Strength to Weight: Bending, points 23
21
Thermal Diffusivity, mm2/s 4.0
8.8
Thermal Shock Resistance, points 16
21

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 0.2
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 0.18
Phosphorus (P), % 0 to 0.060
0
Ruthenium (Ru), % 0
0.080 to 0.14
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
99 to 99.92
Residuals, % 0
0 to 0.4