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ASTM Grade HT Steel vs. R31539 Cobalt

ASTM grade HT steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HT steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 4.6
13 to 22
Fatigue Strength, MPa 130
310 to 480
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 500
1000 to 1340
Tensile Strength: Yield (Proof), MPa 270
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1390
1360
Melting Onset (Solidus), °C 1340
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 12
13
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.0
8.4
Embodied Carbon, kg CO2/kg material 5.4
8.2
Embodied Energy, MJ/kg 76
110
Embodied Water, L/kg 190
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 180
780 to 2000
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
33 to 44
Strength to Weight: Bending, points 18
27 to 32
Thermal Diffusivity, mm2/s 3.2
3.5
Thermal Shock Resistance, points 12
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0.35 to 0.75
0 to 0.14
Chromium (Cr), % 15 to 19
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Iron (Fe), % 38.2 to 51.7
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
5.0 to 7.0
Nickel (Ni), % 33 to 37
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0