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G-CoCr28 Cobalt vs. ASTM A229 Spring Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while ASTM A229 spring steel belongs to the iron alloys. 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 G-CoCr28 cobalt and the bottom bar is ASTM A229 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 6.7
14
Fatigue Strength, MPa 130
710 to 790
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 83
72
Tensile Strength: Ultimate (UTS), MPa 560
1690 to 1890
Tensile Strength: Yield (Proof), MPa 260
1100 to 1230

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Maximum Temperature: Mechanical, °C 1200
400
Melting Completion (Liquidus), °C 1330
1450
Melting Onset (Solidus), °C 1270
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
50
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Base Metal Price, % relative 100
1.8
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.2
1.4
Embodied Energy, MJ/kg 84
19
Embodied Water, L/kg 440
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 160
3260 to 4080
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
60 to 67
Strength to Weight: Bending, points 19
40 to 43
Thermal Diffusivity, mm2/s 2.2
14
Thermal Shock Resistance, points 14
54 to 60

Alloy Composition

Carbon (C), % 0.050 to 0.25
0.55 to 0.85
Chromium (Cr), % 27 to 30
0
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
97.5 to 99
Manganese (Mn), % 0 to 1.5
0.3 to 1.2
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
0
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0.5 to 1.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.050