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S31730 Stainless Steel vs. Grade Ti-Pd8A Titanium

S31730 stainless steel belongs to the iron alloys classification, while grade Ti-Pd8A titanium belongs to the titanium alloys. There are 25 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is S31730 stainless steel and the bottom bar is grade Ti-Pd8A titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
200
Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 40
13
Fatigue Strength, MPa 170
260
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
40
Tensile Strength: Ultimate (UTS), MPa 540
500
Tensile Strength: Yield (Proof), MPa 200
430

Thermal Properties

Latent Heat of Fusion, J/g 290
420
Maximum Temperature: Mechanical, °C 990
320
Melting Completion (Liquidus), °C 1430
1660
Melting Onset (Solidus), °C 1390
1610
Specific Heat Capacity, J/kg-K 470
540
Thermal Expansion, µm/m-K 16
8.7

Otherwise Unclassified Properties

Density, g/cm3 8.0
4.5
Embodied Carbon, kg CO2/kg material 4.6
49
Embodied Energy, MJ/kg 63
840
Embodied Water, L/kg 180
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
65
Resilience: Unit (Modulus of Resilience), kJ/m3 99
880
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 19
31
Strength to Weight: Bending, points 18
31
Thermal Shock Resistance, points 12
39

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.1
Chromium (Cr), % 17 to 19
0
Copper (Cu), % 4.0 to 5.0
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 52.4 to 61
0 to 0.25
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 3.0 to 4.0
0
Nickel (Ni), % 15 to 16.5
0 to 0.050
Nitrogen (N), % 0 to 0.045
0
Oxygen (O), % 0
0 to 0.4
Palladium (Pd), % 0
0.12 to 0.3
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0
98.8 to 99.9
Residuals, % 0
0 to 0.4