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R31538 Cobalt vs. S17700 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while S17700 stainless steel belongs to the iron 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 R31538 cobalt and the bottom bar is S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 23
1.0 to 23
Fatigue Strength, MPa 310 to 480
290 to 560
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 25 to 35
41 to 46
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
1180 to 1650
Tensile Strength: Yield (Proof), MPa 580 to 930
430 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 320
290
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
15
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
2.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.1
2.8
Embodied Energy, MJ/kg 110
40
Embodied Water, L/kg 530
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
15 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
460 to 3750
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
42 to 59
Strength to Weight: Bending, points 27 to 32
32 to 40
Thermal Diffusivity, mm2/s 3.5
4.1
Thermal Shock Resistance, points 25 to 33
39 to 54

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 0.15 to 0.35
0 to 0.090
Chromium (Cr), % 26 to 30
16 to 18
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
70.5 to 76.8
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
6.5 to 7.8
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

Comparable Variants