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ASTM Grade HK Steel vs. R30155 Cobalt

Both ASTM grade HK steel and R30155 cobalt are iron alloys. They have 73% of their average alloy composition in common. 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 grade HK steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 11
34
Fatigue Strength, MPa 150
310
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
81
Tensile Strength: Ultimate (UTS), MPa 500
850
Tensile Strength: Yield (Proof), MPa 270
390

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 440
570
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1350
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 17
14

Otherwise Unclassified Properties

Base Metal Price, % relative 25
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 4.4
9.7
Embodied Energy, MJ/kg 63
150
Embodied Water, L/kg 200
300

Common Calculations

PREN (Pitting Resistance) 27
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 48
230
Resilience: Unit (Modulus of Resilience), kJ/m3 190
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 3.9
3.2
Thermal Shock Resistance, points 11
21

Alloy Composition

Carbon (C), % 0.2 to 0.6
0.080 to 0.16
Chromium (Cr), % 24 to 28
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 44.8 to 57.8
24.3 to 36.2
Manganese (Mn), % 0 to 2.0
1.0 to 2.0
Molybdenum (Mo), % 0 to 0.5
2.5 to 3.5
Nickel (Ni), % 18 to 22
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0