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S15500 Stainless Steel vs. Grade 25 Titanium

S15500 stainless steel belongs to the iron alloys classification, while grade 25 titanium belongs to the titanium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S15500 stainless steel and the bottom bar is grade 25 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 6.8 to 16
11
Fatigue Strength, MPa 350 to 650
550
Poisson's Ratio 0.28
0.32
Reduction in Area, % 17 to 40
29
Shear Modulus, GPa 75
40
Shear Strength, MPa 540 to 870
600
Tensile Strength: Ultimate (UTS), MPa 890 to 1490
1000
Tensile Strength: Yield (Proof), MPa 590 to 1310
940

Thermal Properties

Latent Heat of Fusion, J/g 280
410
Maximum Temperature: Mechanical, °C 820
340
Melting Completion (Liquidus), °C 1430
1610
Melting Onset (Solidus), °C 1380
1560
Specific Heat Capacity, J/kg-K 480
560
Thermal Conductivity, W/m-K 17
7.1
Thermal Expansion, µm/m-K 11
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 2.7
43
Embodied Energy, MJ/kg 39
700
Embodied Water, L/kg 130
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 120
110
Resilience: Unit (Modulus of Resilience), kJ/m3 890 to 4460
4220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 32 to 53
62
Strength to Weight: Bending, points 26 to 37
50
Thermal Diffusivity, mm2/s 4.6
2.8
Thermal Shock Resistance, points 30 to 50
71

Alloy Composition


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Aluminum (Al), % 0
5.5 to 6.8
Carbon (C), % 0 to 0.070
0 to 0.080
Chromium (Cr), % 14 to 15.5
0
Copper (Cu), % 2.5 to 4.5
0
Hydrogen (H), % 0
0 to 0.013
Iron (Fe), % 71.9 to 79.9
0 to 0.4
Manganese (Mn), % 0 to 1.0
0
Nickel (Ni), % 3.5 to 5.5
0.3 to 0.8
Niobium (Nb), % 0.15 to 0.45
0
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.2
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 0.030
0
Titanium (Ti), % 0
86.7 to 90.6
Vanadium (V), % 0
3.5 to 4.5
Residuals, % 0
0 to 0.4