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R30155 Cobalt vs. ASTM A182 Grade F5a

Both R30155 cobalt and ASTM A182 grade F5a are iron alloys. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is ASTM A182 grade F5a.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
310
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
25
Fatigue Strength, MPa 310
380
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34
56
Shear Modulus, GPa 81
74
Shear Strength, MPa 570
450
Tensile Strength: Ultimate (UTS), MPa 850
710
Tensile Strength: Yield (Proof), MPa 390
520

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Maximum Temperature: Mechanical, °C 1100
510
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
40
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
4.5
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
1.8
Embodied Energy, MJ/kg 150
24
Embodied Water, L/kg 300
69

Common Calculations

PREN (Pitting Resistance) 37
6.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
160
Resilience: Unit (Modulus of Resilience), kJ/m3 370
700
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
25
Strength to Weight: Bending, points 24
23
Thermal Diffusivity, mm2/s 3.2
11
Thermal Shock Resistance, points 21
20

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.25
Chromium (Cr), % 20 to 22.5
4.0 to 6.0
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
91.4 to 95.6
Manganese (Mn), % 1.0 to 2.0
0 to 0.6
Molybdenum (Mo), % 2.5 to 3.5
0.44 to 0.65
Nickel (Ni), % 19 to 21
0 to 0.5
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0