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AISI 439 Stainless Steel vs. R30155 Cobalt

Both AISI 439 stainless steel and R30155 cobalt are iron alloys. They have 50% of their average alloy composition in common. There are 32 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 439 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 23
34
Fatigue Strength, MPa 170
310
Poisson's Ratio 0.28
0.29
Reduction in Area, % 51
34
Shear Modulus, GPa 77
81
Shear Strength, MPa 310
570
Tensile Strength: Ultimate (UTS), MPa 490
850
Tensile Strength: Yield (Proof), MPa 250
390

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 530
570
Maximum Temperature: Mechanical, °C 890
1100
Melting Completion (Liquidus), °C 1510
1470
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 25
12
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
80
Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.3
9.7
Embodied Energy, MJ/kg 34
150
Embodied Water, L/kg 120
300

Common Calculations

PREN (Pitting Resistance) 18
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
230
Resilience: Unit (Modulus of Resilience), kJ/m3 160
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 16
21

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Carbon (C), % 0 to 0.030
0.080 to 0.16
Chromium (Cr), % 17 to 19
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 77.1 to 82.8
24.3 to 36.2
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0 to 0.5
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0 to 0.030
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
Titanium (Ti), % 0.2 to 1.1
0
Tungsten (W), % 0
2.0 to 3.0