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AISI 439 Stainless Steel vs. R30008 Cobalt

AISI 439 stainless steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 33% 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 (13, in this case) are not shown.

For each property being compared, the top bar is AISI 439 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, % 23
1.1 to 73
Fatigue Strength, MPa 170
320 to 530
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 490
950 to 1700
Tensile Strength: Yield (Proof), MPa 250
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1510
1400
Melting Onset (Solidus), °C 1430
1330
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
95
Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 2.3
8.1
Embodied Energy, MJ/kg 34
110
Embodied Water, L/kg 120
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 160
590 to 2720
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
31 to 56
Strength to Weight: Bending, points 18
25 to 37
Thermal Shock Resistance, points 16
25 to 44

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Boron (B), % 0
0 to 0.0010
Carbon (C), % 0 to 0.030
0 to 0.15
Chromium (Cr), % 17 to 19
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Iron (Fe), % 77.1 to 82.8
7.6 to 20
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0
6.5 to 7.5
Nickel (Ni), % 0 to 0.5
15 to 18
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0.2 to 1.1
0