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S31727 Stainless Steel vs. Grade 7 Titanium

S31727 stainless steel belongs to the iron alloys classification, while grade 7 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 7 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
150
Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 40
24
Fatigue Strength, MPa 240
250
Poisson's Ratio 0.28
0.32
Reduction in Area, % 56
34
Shear Modulus, GPa 78
38
Shear Strength, MPa 430
270
Tensile Strength: Ultimate (UTS), MPa 630
420
Tensile Strength: Yield (Proof), MPa 270
340

Thermal Properties

Latent Heat of Fusion, J/g 290
420
Maximum Temperature: Mechanical, °C 1010
320
Melting Completion (Liquidus), °C 1440
1660
Melting Onset (Solidus), °C 1390
1610
Specific Heat Capacity, J/kg-K 470
540
Thermal Expansion, µm/m-K 16
9.2

Otherwise Unclassified Properties

Density, g/cm3 8.0
4.5
Embodied Carbon, kg CO2/kg material 4.7
47
Embodied Energy, MJ/kg 64
800
Embodied Water, L/kg 180
470

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
95
Resilience: Unit (Modulus of Resilience), kJ/m3 190
560
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 22
26
Strength to Weight: Bending, points 20
28
Thermal Shock Resistance, points 14
31

Alloy Composition

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 0.3
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 0.25
Palladium (Pd), % 0
0.12 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
98.7 to 99.88
Residuals, % 0
0 to 0.4