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AISI 440A Stainless Steel vs. Grade 12 Titanium

AISI 440A stainless steel belongs to the iron alloys classification, while grade 12 titanium belongs to the titanium alloys. There are 29 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 12 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 5.0 to 20
21
Fatigue Strength, MPa 270 to 790
280
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
39
Shear Strength, MPa 450 to 1040
330
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
530
Tensile Strength: Yield (Proof), MPa 420 to 1650
410

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
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
3.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
6.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
37
Density, g/cm3 7.7
4.5
Embodied Carbon, kg CO2/kg material 2.2
31
Embodied Energy, MJ/kg 31
500
Embodied Water, L/kg 120
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 26 to 65
32
Strength to Weight: Bending, points 23 to 43
32
Thermal Diffusivity, mm2/s 6.2
8.5
Thermal Shock Resistance, points 26 to 65
37

Alloy Composition

Carbon (C), % 0.6 to 0.75
0 to 0.080
Chromium (Cr), % 16 to 18
0
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
0.2 to 0.4
Nickel (Ni), % 0
0.6 to 0.9
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
97.6 to 99.2
Residuals, % 0
0 to 0.4