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AISI 431 Stainless Steel vs. Grade 27 Titanium

AISI 431 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 (5, in this case) are not shown.

For each property being compared, the top bar is AISI 431 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, % 15 to 17
27
Fatigue Strength, MPa 430 to 610
170
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
41
Shear Strength, MPa 550 to 840
180
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
270
Tensile Strength: Yield (Proof), MPa 710 to 1040
230

Thermal Properties

Latent Heat of Fusion, J/g 280
420
Maximum Temperature: Mechanical, °C 850
320
Melting Completion (Liquidus), °C 1510
1660
Melting Onset (Solidus), °C 1450
1610
Specific Heat Capacity, J/kg-K 480
540
Thermal Conductivity, W/m-K 26
21
Thermal Expansion, µm/m-K 12
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
37
Density, g/cm3 7.7
4.5
Embodied Carbon, kg CO2/kg material 2.2
33
Embodied Energy, MJ/kg 31
530
Embodied Water, L/kg 120
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
70
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 32 to 50
17
Strength to Weight: Bending, points 27 to 36
21
Thermal Diffusivity, mm2/s 7.0
8.8
Thermal Shock Resistance, points 28 to 43
21

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.080
Chromium (Cr), % 15 to 17
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 78.2 to 83.8
0 to 0.2
Manganese (Mn), % 0 to 1.0
0
Nickel (Ni), % 1.3 to 2.5
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.18
Phosphorus (P), % 0 to 0.040
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