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S46910 Stainless Steel vs. R30008 Cobalt

S46910 stainless steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 40% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 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 S46910 stainless steel and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 2.2 to 11
1.1 to 73
Fatigue Strength, MPa 250 to 1020
320 to 530
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
83
Tensile Strength: Ultimate (UTS), MPa 680 to 2470
950 to 1700
Tensile Strength: Yield (Proof), MPa 450 to 2290
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 18
95
Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 4.1
8.1
Embodied Energy, MJ/kg 55
110
Embodied Water, L/kg 140
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 510 to 4780
590 to 2720
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 86
31 to 56
Strength to Weight: Bending, points 22 to 51
25 to 37
Thermal Shock Resistance, points 23 to 84
25 to 44

Alloy Composition

Aluminum (Al), % 0.15 to 0.5
0
Boron (B), % 0
0 to 0.0010
Carbon (C), % 0 to 0.030
0 to 0.15
Chromium (Cr), % 11 to 13
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 1.5 to 3.5
0
Iron (Fe), % 65 to 76
7.6 to 20
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 3.0 to 5.0
6.5 to 7.5
Nickel (Ni), % 8.0 to 10
15 to 18
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0 to 0.7
0 to 1.2
Sulfur (S), % 0 to 0.015
0 to 0.015
Titanium (Ti), % 0.5 to 1.2
0

Comparable Variants