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AISI 436 Stainless Steel vs. R30155 Cobalt

Both AISI 436 stainless steel and R30155 cobalt are iron alloys. They have 50% 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 AISI 436 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 25
34
Fatigue Strength, MPa 190
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
81
Shear Strength, MPa 320
570
Tensile Strength: Ultimate (UTS), MPa 500
850
Tensile Strength: Yield (Proof), MPa 270
390

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 460
570
Maximum Temperature: Mechanical, °C 880
1100
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 25
12
Thermal Expansion, µm/m-K 10
14

Otherwise Unclassified Properties

Base Metal Price, % relative 12
80
Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.7
9.7
Embodied Energy, MJ/kg 38
150
Embodied Water, L/kg 120
300

Common Calculations

PREN (Pitting Resistance) 20
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
230
Resilience: Unit (Modulus of Resilience), kJ/m3 190
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 18
28
Strength to Weight: Bending, points 18
24
Thermal Diffusivity, mm2/s 6.7
3.2
Thermal Shock Resistance, points 18
21

Alloy Composition

Carbon (C), % 0 to 0.12
0.080 to 0.16
Chromium (Cr), % 16 to 18
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 77.8 to 83.3
24.3 to 36.2
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0.75 to 1.3
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0 to 0.8
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
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