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ASTM A369 Grade FP21 vs. R30155 Cobalt

Both ASTM A369 grade FP21 and R30155 cobalt are iron alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 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 ASTM A369 grade FP21 and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
220
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 20
34
Fatigue Strength, MPa 160
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
81
Shear Strength, MPa 300
570
Tensile Strength: Ultimate (UTS), MPa 470
850
Tensile Strength: Yield (Proof), MPa 240
390

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Maximum Temperature: Mechanical, °C 470
1100
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 41
12
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.8
9.7
Embodied Energy, MJ/kg 23
150
Embodied Water, L/kg 61
300

Common Calculations

PREN (Pitting Resistance) 6.2
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
230
Resilience: Unit (Modulus of Resilience), kJ/m3 150
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 17
28
Strength to Weight: Bending, points 17
24
Thermal Diffusivity, mm2/s 11
3.2
Thermal Shock Resistance, points 14
21

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.080 to 0.16
Chromium (Cr), % 2.7 to 3.4
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 94.3 to 96.2
24.3 to 36.2
Manganese (Mn), % 0.3 to 0.6
1.0 to 2.0
Molybdenum (Mo), % 0.8 to 1.1
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0