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ASTM A356 Grade 9 vs. R30155 Cobalt

Both ASTM A356 grade 9 and R30155 cobalt are iron alloys. They have a modest 34% 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 A356 grade 9 and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
220
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 17
34
Fatigue Strength, MPa 310
310
Poisson's Ratio 0.29
0.29
Reduction in Area, % 50
34
Shear Modulus, GPa 73
81
Tensile Strength: Ultimate (UTS), MPa 670
850
Tensile Strength: Yield (Proof), MPa 460
390

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Maximum Temperature: Mechanical, °C 440
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 3.6
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 2.4
9.7
Embodied Energy, MJ/kg 33
150
Embodied Water, L/kg 56
300

Common Calculations

PREN (Pitting Resistance) 4.7
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
230
Resilience: Unit (Modulus of Resilience), kJ/m3 570
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 24
28
Strength to Weight: Bending, points 22
24
Thermal Diffusivity, mm2/s 11
3.2
Thermal Shock Resistance, points 19
21

Alloy Composition

Carbon (C), % 0 to 0.2
0.080 to 0.16
Chromium (Cr), % 1.0 to 1.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 95.2 to 97.2
24.3 to 36.2
Manganese (Mn), % 0.5 to 0.9
1.0 to 2.0
Molybdenum (Mo), % 0.9 to 1.2
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 0.035
0 to 0.040
Silicon (Si), % 0.2 to 0.6
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
Vanadium (V), % 0.2 to 0.35
0