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ASTM A229 Spring Steel vs. R30016 Cobalt

ASTM A229 spring steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 14
8.4
Fatigue Strength, MPa 710 to 790
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
85
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
1010
Tensile Strength: Yield (Proof), MPa 1100 to 1230
580

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1410
1270
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 50
15
Thermal Expansion, µm/m-K 12
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.4
7.7
Embodied Energy, MJ/kg 19
110
Embodied Water, L/kg 46
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
72
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
770
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 60 to 67
33
Strength to Weight: Bending, points 40 to 43
26
Thermal Diffusivity, mm2/s 14
3.9
Thermal Shock Resistance, points 54 to 60
24

Alloy Composition

Carbon (C), % 0.55 to 0.85
0.9 to 1.4
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 97.5 to 99
0 to 3.0
Manganese (Mn), % 0.3 to 1.2
0.5 to 2.0
Molybdenum (Mo), % 0
0 to 1.5
Nickel (Ni), % 0
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0.15 to 0.35
0.2 to 2.0
Sulfur (S), % 0 to 0.050
0
Tungsten (W), % 0
3.5 to 5.5