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Grade 21 Titanium vs. SAE-AISI M6 Steel

Grade 21 titanium belongs to the titanium alloys classification, while SAE-AISI M6 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (9, 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 M6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
200
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 51
77
Tensile Strength: Ultimate (UTS), MPa 890 to 1340
840 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 410
260
Melting Completion (Liquidus), °C 1740
1560
Melting Onset (Solidus), °C 1690
1510
Specific Heat Capacity, J/kg-K 500
440
Thermal Conductivity, W/m-K 7.5
17
Thermal Expansion, µm/m-K 7.1
12

Otherwise Unclassified Properties

Base Metal Price, % relative 60
39
Density, g/cm3 5.4
8.4
Embodied Carbon, kg CO2/kg material 32
8.0
Embodied Energy, MJ/kg 490
120
Embodied Water, L/kg 180
160

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 32
23
Strength to Weight: Axial, points 46 to 69
28 to 73
Strength to Weight: Bending, points 38 to 50
24 to 45
Thermal Diffusivity, mm2/s 2.8
4.7
Thermal Shock Resistance, points 66 to 100
26 to 68

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.050
0.75 to 0.85
Chromium (Cr), % 0
3.8 to 4.5
Cobalt (Co), % 0
11 to 13
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
68.8 to 74.6
Manganese (Mn), % 0
0.15 to 0.4
Molybdenum (Mo), % 14 to 16
4.5 to 5.5
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 to 0.030
Silicon (Si), % 0.15 to 0.25
0.2 to 0.45
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 76 to 81.2
0
Tungsten (W), % 0
3.8 to 4.8
Vanadium (V), % 0
1.3 to 1.7
Residuals, % 0 to 0.4
0

Comparable Variants