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S31727 Stainless Steel vs. Grade 9 Titanium

S31727 stainless steel belongs to the iron alloys classification, while grade 9 titanium belongs to the titanium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is grade 9 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 40
11 to 17
Fatigue Strength, MPa 240
330 to 480
Poisson's Ratio 0.28
0.32
Reduction in Area, % 56
28
Shear Modulus, GPa 78
40
Shear Strength, MPa 430
430 to 580
Tensile Strength: Ultimate (UTS), MPa 630
700 to 960
Tensile Strength: Yield (Proof), MPa 270
540 to 830

Thermal Properties

Latent Heat of Fusion, J/g 290
410
Maximum Temperature: Mechanical, °C 1010
330
Melting Completion (Liquidus), °C 1440
1640
Melting Onset (Solidus), °C 1390
1590
Specific Heat Capacity, J/kg-K 470
550
Thermal Expansion, µm/m-K 16
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 24
37
Density, g/cm3 8.0
4.5
Embodied Carbon, kg CO2/kg material 4.7
36
Embodied Energy, MJ/kg 64
580
Embodied Water, L/kg 180
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
89 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 190
1380 to 3220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 22
43 to 60
Strength to Weight: Bending, points 20
39 to 48
Thermal Shock Resistance, points 14
52 to 71

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0 to 0.030
0 to 0.080
Chromium (Cr), % 17.5 to 19
0
Copper (Cu), % 2.8 to 4.0
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 53.7 to 61.3
0 to 0.25
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 3.8 to 4.5
0
Nickel (Ni), % 14.5 to 16.5
0
Nitrogen (N), % 0.15 to 0.21
0 to 0.030
Oxygen (O), % 0
0 to 0.15
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
92.6 to 95.5
Vanadium (V), % 0
2.0 to 3.0
Residuals, % 0
0 to 0.4