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EN 1.4640 Stainless Steel vs. R30155 Cobalt

Both EN 1.4640 stainless steel and R30155 cobalt are iron alloys. They have 57% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.4640 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 200
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 51
34
Fatigue Strength, MPa 230 to 250
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
81
Shear Strength, MPa 440 to 460
570
Tensile Strength: Ultimate (UTS), MPa 620 to 650
850
Tensile Strength: Yield (Proof), MPa 240 to 260
390

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 420
570
Maximum Temperature: Mechanical, °C 930
1100
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 14
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 2.8
9.7
Embodied Energy, MJ/kg 40
150
Embodied Water, L/kg 150
300

Common Calculations

PREN (Pitting Resistance) 20
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250 to 260
230
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 170
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 22 to 23
28
Strength to Weight: Bending, points 21
24
Thermal Diffusivity, mm2/s 4.0
3.2
Thermal Shock Resistance, points 14 to 15
21

Alloy Composition

Carbon (C), % 0.030 to 0.080
0.080 to 0.16
Chromium (Cr), % 18 to 19
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 1.3 to 2.0
0
Iron (Fe), % 67.4 to 73.6
24.3 to 36.2
Manganese (Mn), % 1.5 to 4.0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 5.5 to 6.9
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0.030 to 0.11
0 to 0.2
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0