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S31727 Stainless Steel vs. Titanium 6-7

S31727 stainless steel belongs to the iron alloys classification, while titanium 6-7 belongs to the titanium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is S31727 stainless steel and the bottom bar is titanium 6-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
120
Elongation at Break, % 40
11
Fatigue Strength, MPa 240
530
Poisson's Ratio 0.28
0.33
Reduction in Area, % 56
29
Shear Modulus, GPa 78
45
Shear Strength, MPa 430
610
Tensile Strength: Ultimate (UTS), MPa 630
1020
Tensile Strength: Yield (Proof), MPa 270
900

Thermal Properties

Latent Heat of Fusion, J/g 290
410
Maximum Temperature: Mechanical, °C 1010
300
Melting Completion (Liquidus), °C 1440
1700
Melting Onset (Solidus), °C 1390
1650
Specific Heat Capacity, J/kg-K 470
520
Thermal Expansion, µm/m-K 16
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 24
75
Density, g/cm3 8.0
5.1
Embodied Carbon, kg CO2/kg material 4.7
34
Embodied Energy, MJ/kg 64
540
Embodied Water, L/kg 180
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
110
Resilience: Unit (Modulus of Resilience), kJ/m3 190
3460
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
32
Strength to Weight: Axial, points 22
56
Strength to Weight: Bending, points 20
44
Thermal Shock Resistance, points 14
66

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.5
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 0.0090
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
6.5 to 7.5
Nickel (Ni), % 14.5 to 16.5
0
Niobium (Nb), % 0
6.5 to 7.5
Nitrogen (N), % 0.15 to 0.21
0 to 0.050
Oxygen (O), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
84.9 to 88