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Grade 27 Titanium vs. SAE-AISI 81B45 Steel

Grade 27 titanium belongs to the titanium alloys classification, while SAE-AISI 81B45 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is grade 27 titanium and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 27
12 to 24
Fatigue Strength, MPa 170
250 to 350
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 41
73
Shear Strength, MPa 180
340 to 400
Tensile Strength: Ultimate (UTS), MPa 270
540 to 670
Tensile Strength: Yield (Proof), MPa 230
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 420
250
Maximum Temperature: Mechanical, °C 320
410
Melting Completion (Liquidus), °C 1660
1460
Melting Onset (Solidus), °C 1610
1420
Specific Heat Capacity, J/kg-K 540
470
Thermal Conductivity, W/m-K 21
40
Thermal Expansion, µm/m-K 8.7
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 37
2.3
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 33
1.5
Embodied Energy, MJ/kg 530
20
Embodied Water, L/kg 320
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 240
320 to 840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 17
19 to 24
Strength to Weight: Bending, points 21
19 to 22
Thermal Diffusivity, mm2/s 8.8
11
Thermal Shock Resistance, points 21
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0 to 0.080
0.43 to 0.48
Chromium (Cr), % 0
0.35 to 0.55
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
97 to 98
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 0
0.2 to 0.4
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.035
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0