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ASTM Grade HD Steel vs. R30003 Cobalt

ASTM grade HD steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have 42% of their average alloy composition in common. There are 27 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 HD steel and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 9.1
10 to 73
Fatigue Strength, MPa 140
320 to 560
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
83
Tensile Strength: Ultimate (UTS), MPa 590
970 to 1720
Tensile Strength: Yield (Proof), MPa 270
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Melting Completion (Liquidus), °C 1410
1400
Melting Onset (Solidus), °C 1370
1440
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 16
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 17
95
Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 3.1
8.0
Embodied Energy, MJ/kg 45
110
Embodied Water, L/kg 180
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 180
600 to 2790
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 21
32 to 57
Strength to Weight: Bending, points 20
26 to 38
Thermal Diffusivity, mm2/s 4.3
3.3
Thermal Shock Resistance, points 19
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.5
0 to 0.15
Chromium (Cr), % 26 to 30
19 to 21
Cobalt (Co), % 0
39 to 41
Iron (Fe), % 58.4 to 70
10 to 20.5
Manganese (Mn), % 0 to 1.5
1.5 to 2.5
Molybdenum (Mo), % 0 to 0.5
6.0 to 8.0
Nickel (Ni), % 4.0 to 7.0
14 to 16
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 2.0
0 to 1.2
Sulfur (S), % 0 to 0.040
0 to 0.015