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EN 1.4931 Steel vs. R30155 Cobalt

Both EN 1.4931 steel and R30155 cobalt are iron alloys. They have 45% of their average alloy composition in common. There are 29 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 1.4931 steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 17
34
Fatigue Strength, MPa 410
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 810
850
Tensile Strength: Yield (Proof), MPa 620
390

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Mechanical, °C 600
1100
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 24
12
Thermal Expansion, µm/m-K 14
14

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 2.9
9.7
Embodied Energy, MJ/kg 42
150
Embodied Water, L/kg 100
300

Common Calculations

PREN (Pitting Resistance) 16
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
230
Resilience: Unit (Modulus of Resilience), kJ/m3 970
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 29
28
Strength to Weight: Bending, points 25
24
Thermal Diffusivity, mm2/s 6.5
3.2
Thermal Shock Resistance, points 22
21

Alloy Composition

Carbon (C), % 0.2 to 0.26
0.080 to 0.16
Chromium (Cr), % 11.3 to 12.2
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 83.2 to 86.8
24.3 to 36.2
Manganese (Mn), % 0.5 to 0.8
1.0 to 2.0
Molybdenum (Mo), % 1.0 to 1.2
2.5 to 3.5
Nickel (Ni), % 0 to 1.0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0 to 0.5
2.0 to 3.0
Vanadium (V), % 0.25 to 0.35
0