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Grade 27 Titanium vs. ACI-ASTM CN7MS Steel

Grade 27 titanium belongs to the titanium alloys classification, while ACI-ASTM CN7MS steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is grade 27 titanium and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 27
39
Fatigue Strength, MPa 170
200
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 41
77
Tensile Strength: Ultimate (UTS), MPa 270
540
Tensile Strength: Yield (Proof), MPa 230
230

Thermal Properties

Latent Heat of Fusion, J/g 420
340
Maximum Temperature: Mechanical, °C 320
1040
Melting Completion (Liquidus), °C 1660
1400
Melting Onset (Solidus), °C 1610
1350
Specific Heat Capacity, J/kg-K 540
480
Thermal Conductivity, W/m-K 21
12
Thermal Expansion, µm/m-K 8.7
16

Otherwise Unclassified Properties

Base Metal Price, % relative 37
28
Density, g/cm3 4.5
7.9
Embodied Carbon, kg CO2/kg material 33
5.1
Embodied Energy, MJ/kg 530
71
Embodied Water, L/kg 320
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
170
Resilience: Unit (Modulus of Resilience), kJ/m3 240
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 21
19
Thermal Diffusivity, mm2/s 8.8
3.2
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.070
Chromium (Cr), % 0
18 to 20
Copper (Cu), % 0
1.5 to 2.0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
45.4 to 53.5
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
2.5 to 3.0
Nickel (Ni), % 0
22 to 25
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
2.5 to 3.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0