MakeItFrom.com
Menu (ESC)

ASTM Grade HC Steel vs. R30021 Cobalt

ASTM grade HC steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 ASTM grade HC steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 6.0
9.0
Fatigue Strength, MPa 96
250
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 430
700
Tensile Strength: Yield (Proof), MPa 200
500

Thermal Properties

Latent Heat of Fusion, J/g 310
330
Melting Completion (Liquidus), °C 1410
1350
Melting Onset (Solidus), °C 1370
1190
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.6
8.4
Embodied Carbon, kg CO2/kg material 2.8
8.0
Embodied Energy, MJ/kg 40
110
Embodied Water, L/kg 170
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
57
Resilience: Unit (Modulus of Resilience), kJ/m3 95
570
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 16
23
Strength to Weight: Bending, points 16
21
Thermal Diffusivity, mm2/s 4.5
3.8
Thermal Shock Resistance, points 14
21

Alloy Composition

Carbon (C), % 0 to 0.5
0.2 to 0.35
Chromium (Cr), % 26 to 30
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 61.9 to 74
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.5
4.5 to 6.0
Nickel (Ni), % 0 to 4.0
2.0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 1.5
Sulfur (S), % 0 to 0.040
0