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EN 1.4938 +A Steel vs. Annealed R30003 Cobalt

EN 1.4938 +A steel belongs to the iron alloys classification, while annealed R30003 cobalt belongs to the cobalt alloys. They have a modest 32% 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 (6, in this case) are not shown.

For each property being compared, the top bar is EN 1.4938 +A steel and the bottom bar is annealed R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 17
73
Fatigue Strength, MPa 390
320
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
83
Tensile Strength: Ultimate (UTS), MPa 870
970
Tensile Strength: Yield (Proof), MPa 640
510

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1440
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 30
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
95
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.3
8.0
Embodied Energy, MJ/kg 47
110
Embodied Water, L/kg 110
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 1050
600
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31
32
Strength to Weight: Bending, points 26
26
Thermal Diffusivity, mm2/s 8.1
3.3
Thermal Shock Resistance, points 30
26

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0.080 to 0.15
0 to 0.15
Chromium (Cr), % 11 to 12.5
19 to 21
Cobalt (Co), % 0
39 to 41
Iron (Fe), % 80.5 to 84.8
10 to 20.5
Manganese (Mn), % 0.4 to 0.9
1.5 to 2.5
Molybdenum (Mo), % 1.5 to 2.0
6.0 to 8.0
Nickel (Ni), % 2.0 to 3.0
14 to 16
Nitrogen (N), % 0.020 to 0.040
0
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 1.2
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0.25 to 0.4
0