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AISI 420 Stainless Steel vs. EN 2.4964 Cobalt

AISI 420 stainless steel belongs to the iron alloys classification, while EN 2.4964 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 AISI 420 stainless steel and the bottom bar is EN 2.4964 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 8.0 to 15
40
Fatigue Strength, MPa 220 to 670
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
960
Tensile Strength: Yield (Proof), MPa 380 to 1310
390

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1510
1630
Melting Onset (Solidus), °C 1450
1550
Specific Heat Capacity, J/kg-K 480
400
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.6
Embodied Carbon, kg CO2/kg material 2.0
9.8
Embodied Energy, MJ/kg 28
140
Embodied Water, L/kg 100
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 130
310
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 4410
340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
21
Strength to Weight: Axial, points 25 to 62
28
Strength to Weight: Bending, points 22 to 41
23
Thermal Diffusivity, mm2/s 7.3
3.9
Thermal Shock Resistance, points 25 to 62
25

Alloy Composition

Carbon (C), % 0.15 to 0.4
0.050 to 0.15
Chromium (Cr), % 12 to 14
19 to 21
Cobalt (Co), % 0
46.4 to 58
Iron (Fe), % 82.3 to 87.9
0 to 3.0
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 0.75
9.0 to 11
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 0
14 to 16