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Grade 27 Titanium vs. ASTM A387 Grade 21L Class 1

Grade 27 titanium belongs to the titanium alloys classification, while ASTM A387 grade 21L class 1 belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is grade 27 titanium and the bottom bar is ASTM A387 grade 21L class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 27
21
Fatigue Strength, MPa 170
160
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 41
74
Shear Strength, MPa 180
310
Tensile Strength: Ultimate (UTS), MPa 270
500
Tensile Strength: Yield (Proof), MPa 230
230

Thermal Properties

Latent Heat of Fusion, J/g 420
260
Maximum Temperature: Mechanical, °C 320
480
Melting Completion (Liquidus), °C 1660
1470
Melting Onset (Solidus), °C 1610
1430
Specific Heat Capacity, J/kg-K 540
470
Thermal Conductivity, W/m-K 21
41
Thermal Expansion, µm/m-K 8.7
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 37
4.1
Density, g/cm3 4.5
7.9
Embodied Carbon, kg CO2/kg material 33
1.8
Embodied Energy, MJ/kg 530
23
Embodied Water, L/kg 320
62

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
84
Resilience: Unit (Modulus of Resilience), kJ/m3 240
140
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 17
18
Strength to Weight: Bending, points 21
18
Thermal Diffusivity, mm2/s 8.8
11
Thermal Shock Resistance, points 21
14

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.1
Chromium (Cr), % 0
2.8 to 3.3
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
94.4 to 96.1
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.025
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0 to 0.5
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0