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AISI 440C Stainless Steel vs. Grade 12 Titanium

AISI 440C 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 440C 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, % 2.0 to 14
21
Fatigue Strength, MPa 260 to 840
280
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 76
39
Shear Strength, MPa 430 to 1120
330
Tensile Strength: Ultimate (UTS), MPa 710 to 1970
530
Tensile Strength: Yield (Proof), MPa 450 to 1900
410

Thermal Properties

Latent Heat of Fusion, J/g 280
420
Maximum Temperature: Mechanical, °C 870
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 22
21
Thermal Expansion, µm/m-K 10
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
3.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
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 39 to 88
110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 26 to 71
32
Strength to Weight: Bending, points 23 to 46
32
Thermal Diffusivity, mm2/s 6.0
8.5
Thermal Shock Resistance, points 26 to 71
37

Alloy Composition

Carbon (C), % 1.0 to 1.2
0 to 0.080
Chromium (Cr), % 16 to 18
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 78 to 83.1
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