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Grade 21 Titanium vs. SAE-AISI 1211 Steel

Grade 21 titanium belongs to the titanium alloys classification, while SAE-AISI 1211 steel belongs to the iron alloys. There are 29 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 21 titanium and the bottom bar is SAE-AISI 1211 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
190
Elongation at Break, % 9.0 to 17
11 to 29
Fatigue Strength, MPa 550 to 660
200 to 280
Poisson's Ratio 0.32
0.29
Reduction in Area, % 22
40 to 50
Shear Modulus, GPa 51
73
Shear Strength, MPa 550 to 790
280 to 350
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
430 to 580
Tensile Strength: Yield (Proof), MPa 870 to 1170
260 to 460

Thermal Properties

Latent Heat of Fusion, J/g 410
250
Maximum Temperature: Mechanical, °C 310
400
Melting Completion (Liquidus), °C 1740
1460
Melting Onset (Solidus), °C 1690
1420
Specific Heat Capacity, J/kg-K 500
470
Thermal Conductivity, W/m-K 7.5
52
Thermal Expansion, µm/m-K 7.1
12

Otherwise Unclassified Properties

Base Metal Price, % relative 60
1.8
Density, g/cm3 5.4
7.9
Embodied Carbon, kg CO2/kg material 32
1.4
Embodied Energy, MJ/kg 490
18
Embodied Water, L/kg 180
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 180
61 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 2760 to 5010
180 to 550
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 32
24
Strength to Weight: Axial, points 46 to 69
15 to 21
Strength to Weight: Bending, points 38 to 50
16 to 20
Thermal Diffusivity, mm2/s 2.8
14
Thermal Shock Resistance, points 66 to 100
14 to 18

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.050
0 to 0.13
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
98.7 to 99.23
Manganese (Mn), % 0
0.6 to 0.9
Molybdenum (Mo), % 14 to 16
0
Niobium (Nb), % 2.2 to 3.2
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.17
0
Phosphorus (P), % 0
0.070 to 0.12
Silicon (Si), % 0.15 to 0.25
0
Sulfur (S), % 0
0.1 to 0.15
Titanium (Ti), % 76 to 81.2
0
Residuals, % 0 to 0.4
0

Comparable Variants