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S38815 Stainless Steel vs. R30001 Cobalt

S38815 stainless steel belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt alloys. There are 19 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is S38815 stainless steel and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 34
1.0
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
86
Tensile Strength: Ultimate (UTS), MPa 610
620

Thermal Properties

Latent Heat of Fusion, J/g 370
310
Melting Completion (Liquidus), °C 1360
1530
Melting Onset (Solidus), °C 1310
1260
Specific Heat Capacity, J/kg-K 500
430
Thermal Expansion, µm/m-K 15
11

Otherwise Unclassified Properties

Density, g/cm3 7.5
9.0
Embodied Carbon, kg CO2/kg material 3.8
8.9
Embodied Energy, MJ/kg 54
130
Embodied Water, L/kg 140
460

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 22
19
Strength to Weight: Bending, points 21
18
Thermal Shock Resistance, points 15
19

Alloy Composition

Aluminum (Al), % 0 to 0.3
0
Carbon (C), % 0 to 0.030
2.0 to 3.0
Chromium (Cr), % 13 to 15
28 to 32
Cobalt (Co), % 0
43 to 59
Copper (Cu), % 0.75 to 1.5
0
Iron (Fe), % 56.1 to 67
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0.75 to 1.5
0 to 1.0
Nickel (Ni), % 13 to 17
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 5.5 to 6.5
0 to 2.0
Sulfur (S), % 0 to 0.020
0
Tungsten (W), % 0
11 to 13