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Grade 1 Titanium vs. ASTM A387 Grade 91 Class 2

Grade 1 titanium belongs to the titanium alloys classification, while ASTM A387 grade 91 class 2 belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is grade 1 titanium and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
200
Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 28
20
Fatigue Strength, MPa 170
330
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 39
75
Shear Strength, MPa 200
420
Tensile Strength: Ultimate (UTS), MPa 310
670
Tensile Strength: Yield (Proof), MPa 220
470

Thermal Properties

Latent Heat of Fusion, J/g 420
270
Maximum Temperature: Mechanical, °C 320
600
Melting Completion (Liquidus), °C 1660
1460
Melting Onset (Solidus), °C 1610
1420
Specific Heat Capacity, J/kg-K 540
470
Thermal Conductivity, W/m-K 20
26
Thermal Expansion, µm/m-K 8.8
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.7
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 7.3
10

Otherwise Unclassified Properties

Base Metal Price, % relative 37
7.0
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 31
2.6
Embodied Energy, MJ/kg 510
37
Embodied Water, L/kg 110
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79
120
Resilience: Unit (Modulus of Resilience), kJ/m3 230
580
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 19
24
Strength to Weight: Bending, points 23
22
Thermal Diffusivity, mm2/s 8.2
6.9
Thermal Shock Resistance, points 24
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.080
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
87.3 to 90.3
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0 to 0.030
0.030 to 0.070
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0
0.2 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 99.095 to 100
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010
Residuals, % 0 to 0.4
0