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Grade 27 Titanium vs. ASTM Grade HC Steel

Grade 27 titanium belongs to the titanium alloys classification, while ASTM grade HC steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is grade 27 titanium and the bottom bar is ASTM grade HC steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 27
6.0
Fatigue Strength, MPa 170
96
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 41
80
Tensile Strength: Ultimate (UTS), MPa 270
430
Tensile Strength: Yield (Proof), MPa 230
200

Thermal Properties

Latent Heat of Fusion, J/g 420
310
Maximum Temperature: Mechanical, °C 320
1100
Melting Completion (Liquidus), °C 1660
1410
Melting Onset (Solidus), °C 1610
1370
Specific Heat Capacity, J/kg-K 540
490
Thermal Conductivity, W/m-K 21
17
Thermal Expansion, µm/m-K 8.7
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 37
14
Density, g/cm3 4.5
7.6
Embodied Carbon, kg CO2/kg material 33
2.8
Embodied Energy, MJ/kg 530
40
Embodied Water, L/kg 320
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
21
Resilience: Unit (Modulus of Resilience), kJ/m3 240
95
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 35
26
Strength to Weight: Axial, points 17
16
Strength to Weight: Bending, points 21
16
Thermal Diffusivity, mm2/s 8.8
4.5
Thermal Shock Resistance, points 21
14

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.5
Chromium (Cr), % 0
26 to 30
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
61.9 to 74
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 4.0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.040
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0