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S40975 Stainless Steel vs. Grade 21 Titanium

S40975 stainless steel belongs to the iron alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S40975 stainless steel and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
140
Elongation at Break, % 22
9.0 to 17
Fatigue Strength, MPa 210
550 to 660
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 75
51
Shear Strength, MPa 290
550 to 790
Tensile Strength: Ultimate (UTS), MPa 460
890 to 1340
Tensile Strength: Yield (Proof), MPa 310
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 270
410
Maximum Temperature: Mechanical, °C 710
310
Melting Completion (Liquidus), °C 1450
1740
Melting Onset (Solidus), °C 1400
1690
Specific Heat Capacity, J/kg-K 480
500
Thermal Conductivity, W/m-K 26
7.5
Thermal Expansion, µm/m-K 10
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
60
Density, g/cm3 7.8
5.4
Embodied Carbon, kg CO2/kg material 2.0
32
Embodied Energy, MJ/kg 28
490
Embodied Water, L/kg 95
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 93
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 250
2760 to 5010
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
32
Strength to Weight: Axial, points 17
46 to 69
Strength to Weight: Bending, points 17
38 to 50
Thermal Diffusivity, mm2/s 7.0
2.8
Thermal Shock Resistance, points 17
66 to 100

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0 to 0.030
0 to 0.050
Chromium (Cr), % 10.5 to 11.7
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 84.4 to 89
0 to 0.4
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0
14 to 16
Nickel (Ni), % 0.5 to 1.0
0
Niobium (Nb), % 0
2.2 to 3.2
Nitrogen (N), % 0 to 0.030
0 to 0.030
Oxygen (O), % 0
0 to 0.17
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0.15 to 0.25
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0 to 0.75
76 to 81.2
Residuals, % 0
0 to 0.4