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Grade 21 Titanium vs. SAE-AISI H42 Steel

Grade 21 titanium belongs to the titanium alloys classification, while SAE-AISI H42 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 H42 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
700 to 1980

Thermal Properties

Latent Heat of Fusion, J/g 410
260
Melting Completion (Liquidus), °C 1740
1620
Melting Onset (Solidus), °C 1690
1570
Specific Heat Capacity, J/kg-K 500
440
Thermal Conductivity, W/m-K 7.5
24
Thermal Expansion, µm/m-K 7.1
12

Otherwise Unclassified Properties

Base Metal Price, % relative 60
24
Density, g/cm3 5.4
8.4
Embodied Carbon, kg CO2/kg material 32
8.8
Embodied Energy, MJ/kg 490
130
Embodied Water, L/kg 180
98

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 32
23
Strength to Weight: Axial, points 46 to 69
23 to 65
Strength to Weight: Bending, points 38 to 50
21 to 42
Thermal Diffusivity, mm2/s 2.8
6.5
Thermal Shock Resistance, points 66 to 100
20 to 57

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.050
0.55 to 0.7
Chromium (Cr), % 0
3.8 to 4.5
Copper (Cu), % 0
0 to 0.25
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.4
79.3 to 83.8
Manganese (Mn), % 0
0.15 to 0.4
Molybdenum (Mo), % 14 to 16
4.5 to 5.5
Nickel (Ni), % 0
0 to 0.3
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
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 76 to 81.2
0
Tungsten (W), % 0
5.5 to 6.8
Vanadium (V), % 0
1.8 to 2.2
Residuals, % 0 to 0.4
0

Comparable Variants