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R30155 Cobalt vs. ASTM Grade HN Steel

Both R30155 cobalt and ASTM grade HN steel are iron alloys. They have 73% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
140
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
9.0
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
77
Tensile Strength: Ultimate (UTS), MPa 850
500

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Maximum Temperature: Corrosion, °C 570
420
Maximum Temperature: Mechanical, °C 1100
1080
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1420
1350
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
13
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 80
26
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 9.7
4.6
Embodied Energy, MJ/kg 150
66
Embodied Water, L/kg 300
180

Common Calculations

PREN (Pitting Resistance) 37
22
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
17
Strength to Weight: Bending, points 24
18
Thermal Diffusivity, mm2/s 3.2
3.5
Thermal Shock Resistance, points 21
11

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.2 to 0.5
Chromium (Cr), % 20 to 22.5
19 to 23
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
44.9 to 57.8
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.5
0 to 0.5
Nickel (Ni), % 19 to 21
23 to 27
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 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0