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S44635 Stainless Steel vs. R30155 Cobalt

Both S44635 stainless steel and R30155 cobalt are iron alloys. They have 60% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is S44635 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
220
Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 23
34
Fatigue Strength, MPa 390
310
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 81
81
Shear Strength, MPa 450
570
Tensile Strength: Ultimate (UTS), MPa 710
850
Tensile Strength: Yield (Proof), MPa 580
390

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 610
570
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 16
12
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 22
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 4.4
9.7
Embodied Energy, MJ/kg 62
150
Embodied Water, L/kg 170
300

Common Calculations

PREN (Pitting Resistance) 39
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
230
Resilience: Unit (Modulus of Resilience), kJ/m3 810
370
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 25
28
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 4.4
3.2
Thermal Shock Resistance, points 23
21

Alloy Composition

Carbon (C), % 0 to 0.025
0.080 to 0.16
Chromium (Cr), % 24.5 to 26
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 61.5 to 68.5
24.3 to 36.2
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
2.5 to 3.5
Nickel (Ni), % 3.5 to 4.5
19 to 21
Niobium (Nb), % 0.2 to 0.8
0.75 to 1.3
Nitrogen (N), % 0 to 0.035
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
Titanium (Ti), % 0.2 to 0.8
0
Tungsten (W), % 0
2.0 to 3.0