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AISI 440A Stainless Steel vs. Grade 30 Titanium

AISI 440A stainless steel belongs to the iron alloys classification, while grade 30 titanium belongs to the titanium alloys. There are 28 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 AISI 440A stainless steel and the bottom bar is grade 30 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 5.0 to 20
23
Fatigue Strength, MPa 270 to 790
250
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
41
Shear Strength, MPa 450 to 1040
240
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
390
Tensile Strength: Yield (Proof), MPa 420 to 1650
350

Thermal Properties

Latent Heat of Fusion, J/g 280
420
Maximum Temperature: Mechanical, °C 760
320
Melting Completion (Liquidus), °C 1480
1660
Melting Onset (Solidus), °C 1370
1610
Specific Heat Capacity, J/kg-K 480
540
Thermal Conductivity, W/m-K 23
21
Thermal Expansion, µm/m-K 10
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
6.9

Otherwise Unclassified Properties

Density, g/cm3 7.7
4.5
Embodied Carbon, kg CO2/kg material 2.2
36
Embodied Energy, MJ/kg 31
600
Embodied Water, L/kg 120
230

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
86
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 26 to 65
24
Strength to Weight: Bending, points 23 to 43
26
Thermal Diffusivity, mm2/s 6.2
8.6
Thermal Shock Resistance, points 26 to 65
30

Alloy Composition

Carbon (C), % 0.6 to 0.75
0 to 0.080
Chromium (Cr), % 16 to 18
0
Cobalt (Co), % 0
0.2 to 0.8
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 78.4 to 83.4
0 to 0.3
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.75
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Palladium (Pd), % 0
0.040 to 0.080
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
98 to 99.76
Residuals, % 0
0 to 0.4