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AISI 204 Stainless Steel vs. R30012 Cobalt

AISI 204 stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is AISI 204 stainless steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 23 to 39
1.0
Fatigue Strength, MPa 320 to 720
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 730 to 1100
830
Tensile Strength: Yield (Proof), MPa 380 to 1080
650

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1370
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.8
Embodied Carbon, kg CO2/kg material 2.4
8.3
Embodied Energy, MJ/kg 35
120
Embodied Water, L/kg 130
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240 to 250
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 360 to 2940
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27 to 40
26
Strength to Weight: Bending, points 24 to 31
22
Thermal Diffusivity, mm2/s 4.1
3.8
Thermal Shock Resistance, points 16 to 24
23

Alloy Composition

Carbon (C), % 0 to 0.030
1.4 to 2.0
Chromium (Cr), % 15 to 17
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 69.6 to 76.4
0 to 3.0
Manganese (Mn), % 7.0 to 9.0
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 1.5 to 3.0
0 to 3.0
Nitrogen (N), % 0.15 to 0.3
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5