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AISI 329 Stainless Steel vs. Grade 21 Titanium

AISI 329 stainless steel belongs to the iron alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 28 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 AISI 329 stainless steel and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
140
Elongation at Break, % 17
9.0 to 17
Fatigue Strength, MPa 330
550 to 660
Poisson's Ratio 0.27
0.32
Shear Modulus, GPa 80
51
Shear Strength, MPa 440
550 to 790
Tensile Strength: Ultimate (UTS), MPa 710
890 to 1340
Tensile Strength: Yield (Proof), MPa 540
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 300
410
Maximum Temperature: Mechanical, °C 1100
310
Melting Completion (Liquidus), °C 1440
1740
Melting Onset (Solidus), °C 1390
1690
Specific Heat Capacity, J/kg-K 480
500
Thermal Conductivity, W/m-K 16
7.5
Thermal Expansion, µm/m-K 13
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 16
60
Density, g/cm3 7.7
5.4
Embodied Carbon, kg CO2/kg material 3.1
32
Embodied Energy, MJ/kg 44
490
Embodied Water, L/kg 170
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 730
2760 to 5010
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
32
Strength to Weight: Axial, points 25
46 to 69
Strength to Weight: Bending, points 23
38 to 50
Thermal Diffusivity, mm2/s 4.3
2.8
Thermal Shock Resistance, points 19
66 to 100

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0 to 0.080
0 to 0.050
Chromium (Cr), % 23 to 28
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 63.1 to 74
0 to 0.4
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 1.0 to 2.0
14 to 16
Nickel (Ni), % 2.0 to 5.0
0
Niobium (Nb), % 0
2.2 to 3.2
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.17
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.75
0.15 to 0.25
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
76 to 81.2
Residuals, % 0
0 to 0.4