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S17400 Stainless Steel vs. R30006 Cobalt

S17400 stainless steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. There are 28 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 S17400 stainless steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 11 to 21
1.0
Fatigue Strength, MPa 380 to 670
260
Poisson's Ratio 0.28
0.28
Rockwell C Hardness 27 to 43
40
Shear Modulus, GPa 75
85
Tensile Strength: Ultimate (UTS), MPa 910 to 1390
900
Tensile Strength: Yield (Proof), MPa 580 to 1250
540

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1400
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
1.7

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.6
Embodied Carbon, kg CO2/kg material 2.7
7.8
Embodied Energy, MJ/kg 39
110
Embodied Water, L/kg 130
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 4060
670
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 32 to 49
29
Strength to Weight: Bending, points 27 to 35
24
Thermal Diffusivity, mm2/s 4.5
3.9
Thermal Shock Resistance, points 30 to 46
26

Alloy Composition

Carbon (C), % 0 to 0.070
0.9 to 1.4
Chromium (Cr), % 15 to 17
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Copper (Cu), % 3.0 to 5.0
0
Iron (Fe), % 70.4 to 78.9
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 3.0 to 5.0
0 to 3.0
Niobium (Nb), % 0.15 to 0.45
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
4.0 to 6.0