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Grade 2 Titanium vs. AISI 444 Stainless Steel

Grade 2 titanium belongs to the titanium alloys classification, while AISI 444 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is grade 2 titanium and the bottom bar is AISI 444 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
190
Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 23
23
Fatigue Strength, MPa 250
210
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 38
78
Shear Strength, MPa 270
300
Tensile Strength: Ultimate (UTS), MPa 420
470
Tensile Strength: Yield (Proof), MPa 360
310

Thermal Properties

Latent Heat of Fusion, J/g 420
290
Maximum Temperature: Mechanical, °C 320
930
Melting Completion (Liquidus), °C 1660
1460
Melting Onset (Solidus), °C 1610
1420
Specific Heat Capacity, J/kg-K 540
480
Thermal Conductivity, W/m-K 22
23
Thermal Expansion, µm/m-K 9.0
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 7.2
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 37
15
Density, g/cm3 4.5
7.7
Embodied Carbon, kg CO2/kg material 31
3.4
Embodied Energy, MJ/kg 510
47
Embodied Water, L/kg 110
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 92
95
Resilience: Unit (Modulus of Resilience), kJ/m3 600
240
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 26
17
Strength to Weight: Bending, points 28
17
Thermal Diffusivity, mm2/s 8.9
6.2
Thermal Shock Resistance, points 32
16

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.025
Chromium (Cr), % 0
17.5 to 19.5
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.3
73.3 to 80.8
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
1.8 to 2.5
Nickel (Ni), % 0
0 to 1.0
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0 to 0.030
0 to 0.035
Oxygen (O), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 98.9 to 100
0.2 to 0.8
Residuals, % 0 to 0.4
0