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ASTM Grade HT Steel vs. G-CoCr28 Cobalt

ASTM grade HT steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 38% 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 (5, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HT steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 4.6
6.7
Fatigue Strength, MPa 130
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
83
Tensile Strength: Ultimate (UTS), MPa 500
560
Tensile Strength: Yield (Proof), MPa 270
260

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Maximum Temperature: Mechanical, °C 1010
1200
Melting Completion (Liquidus), °C 1390
1330
Melting Onset (Solidus), °C 1340
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
8.5
Thermal Expansion, µm/m-K 15
14

Otherwise Unclassified Properties

Base Metal Price, % relative 31
100
Density, g/cm3 8.0
8.1
Embodied Carbon, kg CO2/kg material 5.4
6.2
Embodied Energy, MJ/kg 76
84
Embodied Water, L/kg 190
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19
31
Resilience: Unit (Modulus of Resilience), kJ/m3 180
160
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
19
Strength to Weight: Bending, points 18
19
Thermal Diffusivity, mm2/s 3.2
2.2
Thermal Shock Resistance, points 12
14

Alloy Composition

Carbon (C), % 0.35 to 0.75
0.050 to 0.25
Chromium (Cr), % 15 to 19
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 38.2 to 51.7
9.7 to 24.5
Manganese (Mn), % 0 to 2.0
0 to 1.5
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 33 to 37
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.5
0.5 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.030