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SAE-AISI 1108 Steel vs. Grade 21 Titanium

SAE-AISI 1108 steel belongs to the iron alloys classification, while grade 21 titanium belongs to the titanium 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 SAE-AISI 1108 steel and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
140
Elongation at Break, % 23 to 34
9.0 to 17
Fatigue Strength, MPa 170 to 260
550 to 660
Poisson's Ratio 0.29
0.32
Reduction in Area, % 45 to 57
22
Shear Modulus, GPa 73
51
Shear Strength, MPa 250 to 280
550 to 790
Tensile Strength: Ultimate (UTS), MPa 380 to 440
890 to 1340
Tensile Strength: Yield (Proof), MPa 220 to 360
870 to 1170

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95 to 110
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 340
2760 to 5010
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
32
Strength to Weight: Axial, points 13 to 16
46 to 69
Strength to Weight: Bending, points 15 to 16
38 to 50
Thermal Diffusivity, mm2/s 14
2.8
Thermal Shock Resistance, points 12 to 14
66 to 100

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0.080 to 0.13
0 to 0.050
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 98.9 to 99.24
0 to 0.4
Manganese (Mn), % 0.6 to 0.8
0
Molybdenum (Mo), % 0
14 to 16
Niobium (Nb), % 0
2.2 to 3.2
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.17
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0.15 to 0.25
Sulfur (S), % 0.080 to 0.13
0
Titanium (Ti), % 0
76 to 81.2
Residuals, % 0
0 to 0.4

Comparable Variants