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R31537 Cobalt vs. S17400 Stainless Steel

R31537 cobalt belongs to the cobalt alloys classification, while S17400 stainless steel belongs to the iron alloys. There are 29 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 R31537 cobalt and the bottom bar is S17400 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 14 to 23
11 to 21
Fatigue Strength, MPa 310 to 480
380 to 670
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 23
40 to 62
Rockwell C Hardness 25 to 35
27 to 43
Shear Modulus, GPa 87
75
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
910 to 1390
Tensile Strength: Yield (Proof), MPa 590 to 940
580 to 1250

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.7
Embodied Energy, MJ/kg 110
39
Embodied Water, L/kg 530
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
880 to 4060
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
32 to 49
Strength to Weight: Bending, points 26 to 32
27 to 35
Thermal Diffusivity, mm2/s 3.4
4.5
Thermal Shock Resistance, points 24 to 32
30 to 46

Alloy Composition

Carbon (C), % 0 to 0.14
0 to 0.070
Chromium (Cr), % 26 to 30
15 to 17
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
3.0 to 5.0
Iron (Fe), % 0 to 0.75
70.4 to 78.9
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
3.0 to 5.0
Niobium (Nb), % 0
0.15 to 0.45
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030