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S20910 Stainless Steel vs. R30155 Cobalt

Both S20910 stainless steel and R30155 cobalt are iron alloys. They have 68% of their average alloy composition in common.

For each property being compared, the top bar is S20910 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230 to 290
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 14 to 39
34
Fatigue Strength, MPa 310 to 460
310
Poisson's Ratio 0.28
0.29
Reduction in Area, % 56 to 62
34
Shear Modulus, GPa 79
81
Shear Strength, MPa 500 to 570
570
Tensile Strength: Ultimate (UTS), MPa 780 to 940
850
Tensile Strength: Yield (Proof), MPa 430 to 810
390

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 460
570
Maximum Temperature: Mechanical, °C 1080
1100
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 13
12
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 22
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 4.8
9.7
Embodied Energy, MJ/kg 68
150
Embodied Water, L/kg 180
300

Common Calculations

PREN (Pitting Resistance) 34
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 260
230
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 1640
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 28 to 33
28
Strength to Weight: Bending, points 24 to 27
24
Thermal Diffusivity, mm2/s 3.6
3.2
Thermal Shock Resistance, points 17 to 21
21

Alloy Composition

Carbon (C), % 0 to 0.060
0.080 to 0.16
Chromium (Cr), % 20.5 to 23.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 52.1 to 62.1
24.3 to 36.2
Manganese (Mn), % 4.0 to 6.0
1.0 to 2.0
Molybdenum (Mo), % 1.5 to 3.0
2.5 to 3.5
Nickel (Ni), % 11.5 to 13.5
19 to 21
Niobium (Nb), % 0.1 to 0.3
0.75 to 1.3
Nitrogen (N), % 0.2 to 0.4
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0
Vanadium (V), % 0.1 to 0.3
0