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S28200 Stainless Steel vs. R30001 Cobalt

S28200 stainless steel belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is S28200 stainless steel and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 45
1.0
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 870
620

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Melting Completion (Liquidus), °C 1380
1530
Melting Onset (Solidus), °C 1330
1260
Specific Heat Capacity, J/kg-K 480
430
Thermal Expansion, µm/m-K 18
11

Otherwise Unclassified Properties

Density, g/cm3 7.6
9.0
Embodied Carbon, kg CO2/kg material 2.8
8.9
Embodied Energy, MJ/kg 41
130
Embodied Water, L/kg 160
460

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
22
Strength to Weight: Axial, points 32
19
Strength to Weight: Bending, points 27
18
Thermal Shock Resistance, points 17
19

Alloy Composition

Carbon (C), % 0 to 0.15
2.0 to 3.0
Chromium (Cr), % 17 to 19
28 to 32
Cobalt (Co), % 0
43 to 59
Copper (Cu), % 0.75 to 1.3
0
Iron (Fe), % 57.7 to 64.1
0 to 3.0
Manganese (Mn), % 17 to 19
0
Molybdenum (Mo), % 0.75 to 1.3
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Nitrogen (N), % 0.4 to 0.6
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
11 to 13